November 25, 2024

Winter Roars Into Ontario This Week With Freezing Rain Threat; Snow Squalls Could Dump Up to 50cm of Snow

November 25, 2024/ Brennen Perry

***NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE***

While winter has gotten off to a slow start across Southern Ontario, with many areas only seeing their first snowfall within the past week or two, it seems that change is on the way. November is shaping up to go out like a lion, as Mother Nature makes up for lost time.

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A significant pattern shift is expected to bring the threat of freezing rain late Monday across Central and Eastern Ontario. This will be followed by multiple weaker systems across the Great Lakes region and colder air flooding into the province.

That colder air will set the stage for what could become our first major snow squall event later this week and into the weekend. In some typical snowbelt areas, snowfall could be measured in feet (30+ cm) by this time next week!

Let’s break down what is shaping up to be a very dynamic and active forecast over the next five to seven days, starting with the freezing rain threat.

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Freezing Rain Risk: Monday into Tuesday

**PRECIPITATION TYPE** - MAP FROM WEATHERBELL

A system is expected to move into Southwestern Ontario and the Golden Horseshoe beginning Monday afternoon. With temperatures forecasted to stay well above freezing in these areas, precipitation will fall as rain.

However, as the system moves northeast into Central and Eastern Ontario after midnight, it will encounter a stubborn layer of colder air near the surface. Temperatures hovering near or just below freezing may allow some of the rain to fall as freezing rain overnight into early Tuesday morning.

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There remains some uncertainty about how widespread this pocket of cold air will be. Higher-elevation areas of Central and Eastern Ontario, including Bancroft, Barry’s Bay, and Algonquin Park, are most likely to experience freezing rain. It’s also possible for freezing rain to extend westward to Muskoka and Parry Sound, and eastward into the Ottawa Valley, including the City of Ottawa.

For Bancroft, Barry’s Bay, and Algonquin Park, ice accretion totals could reach 2-4 mm by Tuesday morning, though any ice will quickly melt after sunrise as temperatures rise above freezing by late morning. In Muskoka and the Ottawa Valley, a thin layer of ice on untreated surfaces is possible, which could make for a slow Tuesday morning commute. There is a slight chance of school bus cancellations in affected areas.

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Northern Ontario: Heavy Snowfall Ahead

Northern Ontario will experience heavy snow from this same system, as colder air dominates in the region. Light to moderate snowfall is expected to begin in Northwestern Ontario by early Monday afternoon, gradually spreading eastward into the evening and overnight.

Snow will continue across Northern Ontario throughout Tuesday, with the heaviest snowfall expected near the Quebec border in Northeastern Ontario. Snowfall will gradually ease later on Tuesday and into early Wednesday but could persist near James Bay in a zone extending from Hearst to Lansdowne House.

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Over three days, snowfall totals will generally range from 10 to 20 cm across Northern Ontario. Far Northern Ontario near James Bay could see totals exceeding 20 cm by Thursday, while lake-enhanced snowfall southeast of Lake Superior, including Sault Ste. Marie, could push totals closer to 30 cm.

Thunder Bay is expected to see slightly less snow, as the city may end up in a drier part of the system. Forecasts currently suggest snowfall amounts of 5 to 10 cm in this area.

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Southern Ontario: Cold Air and Lake Effect Snow

As the system moves out of Southern Ontario late Tuesday, a surge of cold air will follow in its wake. This will briefly activate the lake effect snow machine around Lake Huron and Georgian Bay beginning Tuesday evening and lasting into Wednesday.

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At this time, temperatures are expected to hover near the freezing mark, which could limit significant accumulation. The most likely target zone for this initial burst of lake effect snow includes areas east of Georgian Bay, such as Parry Sound, Huntsville, and Bracebridge. These areas could see 10-15 cm, with localized amounts of up to 20 cm by the time snow bands taper off Wednesday evening.

For higher elevations southeast of Owen Sound, including Hanover, Markdale, Shelburne, and Orangeville, up to 5-10 cm of snow is possible, as cooler temperatures in these areas will allow snow to accumulate more easily. Surrounding regions, including parts of the Greater Toronto Area, may see just a few light flurries.

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End of the Week: A Snow Squall Event Looms

Lake effect snow will temporarily pause as another system slides through the Great Lakes region. However, this system appears to stay largely south of the border, bringing only a few flurries or light showers to areas near Lake Erie and the Golden Horseshoe early Thursday.

As we approach the weekend, Southern Ontario will see its coldest air of the season so far, with overnight lows plunging to several degrees below freezing across much of the province.

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A dominant westerly to northwesterly wind is expected to develop Friday and persist into the weekend. This setup will create ideal conditions for intense snow squalls off Lake Huron, Lake Superior, and Georgian Bay starting Friday afternoon and lasting through the weekend.

These snow squalls could bring significant snowfall totals, blowing snow, and near-zero visibility to localized areas in the snowbelt. Travel could become difficult or even dangerous in the hardest-hit regions.

Based on the current forecasted wind direction, regions including Kincardine, Owen Sound, Hanover, Midland, Oro, Orillia, and Gravenhurst are likely to see the heaviest impacts. This also extends up into Northern Ontario around the Lake Superior shoreline with Sault Ste. Marie in the bullseye. Some locations within this zone could receive up to 50 cm of snow by the end of the weekend.

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Snow Squall Uncertainty

It’s important to note that snow squalls are highly localized events, and not everyone will experience intense snowfall totals. One area may receive significant snow accumulations, while locations just a few kilometres away might see only a dusting.

Confidence is high that some sort of snow squall event will occur, but exact locations will depend on the finer details of wind direction and temperatures.

Environment Canada has also mentioned the potential for significant snow squalls later this week:

The first significant lake effect snow of the season is likely beginning Friday. This has the potential to be a highly disruptive and prolonged event for areas near Lake Huron, Georgian Bay and eastern Lake Superior. While confidence is medium to high that lake effect snow and blowing snow will occur, confidence in exact locations to be affected as well as snowfall accumulations is low. As is normally the case in these situations, snowfall amounts will be highly variable. Some areas may see well in excess of 50 cm by the end of the weekend. - Environment Canada

Stay tuned for updated forecasts in the coming days as higher-resolution models provide more details. We’ll refine the snow squall forecast and pinpoint areas most at risk.

November 20, 2024

Season’s First Snowfall Possible for Wide Swath of Southern Ontario Starting Late Wednesday

November 20, 2024/ Brennen Perry

Over the past week, calm conditions have dominated the weather story across Southern Ontario. This pattern has also brought a return to more seasonal temperatures typical for this time of year, a noticeable shift from the unseasonably warm weather that lingered into early November.

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One notable absence so far this season is snow—a staple of November in Southern Ontario. While some regions, especially higher elevations in Central Ontario, the Ottawa Valley, and the Dundalk Highlands, experienced their first flurries as early as September and October, much of Southern Ontario has yet to see its first snowfall.

That, however, could soon change with the arrival of multiple weather systems in the coming days, bringing colder air and the potential for wet flurries as early as Wednesday evening and into Thursday and Friday.

The good news for those not yet ready to embrace winter is that significant accumulation isn’t expected with this initial blast of wintry weather. Temperatures are forecast to hover just above freezing, which will likely limit accumulation as any snow melts upon contact with the wet and relatively warm ground left behind by earlier rainfall.

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In addition to the season’s first flurries, a slow-moving system will stall over the Great Lakes region, pulling in moisture from another system over New England. This setup will lead to ample precipitation, with heavy rain expected to persist into the start of the weekend. Eastern Ontario is poised to bear the brunt of this rainfall, with totals ranging from 25 to 50 mm between Wednesday and Saturday.

**SIMULATED RADAR** - MAP FROM WEATHERBELL

The rain is expected to begin on Wednesday afternoon, with the initial band of heavy rain arriving in Deep Southwestern Ontario and areas near the Lake Erie shoreline by dinnertime.

This line of precipitation may also bring embedded, non-severe thunderstorms and wind gusts of 70-80 km/h. While most gusts are expected to remain below the severe threshold, isolated gusts near 90 km/h are possible, particularly over the Niagara region during the early evening hours.

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As this line of rain races across Southwestern Ontario and into the Golden Horseshoe, colder air will begin rushing in from the west. However, there is some disagreement among models regarding how quickly temperatures will drop and how rapidly the precipitation will move. Some projections suggest a sharp cooldown, with temperatures in Southwestern Ontario nearing freezing by Wednesday evening.

If this happens, rain could transition to wet snow in areas such as Sarnia, London, Goderich, Kitchener, Guelph, and Orangeville. However, with earlier rainfall and temperatures still above freezing, any snow is likely to melt on contact. Elevated areas northwest of the GTA, particularly the Dundalk Highlands, may see light accumulation of up to 2-4 cm overnight into Thursday morning.

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By Thursday morning, most of the moisture will shift into Central and Eastern Ontario, with the centre of the low-pressure system stalled over Lake Huron. Meanwhile, a secondary system over New England will provide additional moisture, enhancing precipitation over Eastern Ontario throughout the day.

Temperatures in parts of Eastern Ontario, particularly southwest of Ottawa and in higher elevations, will hover near the freezing mark, creating a chance for wet flurries. Closer to the international border extending into the Ottawa region, heavy rain will likely continue.

Precipitation is expected to persist overnight Thursday and linger into Friday, with the heaviest rain focused on Eastern Ontario. In Central and Southwestern Ontario, lingering showers are possible Friday morning and afternoon, though they won’t be as intense as in the east.

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For rainfall totals, Eastern Ontario, including Kingston and Ottawa, can expect 25 to 50 mm by Saturday. The rest of Southern Ontario will likely see 10 to 25 mm, though isolated pockets could receive closer to 30-40 mm during thunderstorm activity.

Higher elevations in Eastern Ontario, particularly near Bancroft, may see persistent snow showers that could result in minor accumulation of up to 2-5 cm by Friday morning. However, with temperatures so close to freezing, it’s uncertain how much snow will stick.

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Looking ahead to the weekend, there’s good news for those not ready for snow. Earlier model predictions suggested a significant cooldown that could trigger lake-effect snow. However, the latest data indicates the cooldown won’t be as intense as initially thought.

While some lake-effect showers are still possible along the Lake Huron shoreline and southeast of Georgian Bay on Saturday, it likely won’t be cold enough for those showers to fall as snow.

November 05, 2024

What's in a Name? Choosing the Right Tires to Drive you Through Canadian Winters

November 05, 2024/ Alannah Campbell

*Tread patterns of summer, all season and winter tires. Image courtesy of* *discount tire*.

Now that it’s the first week of November, many Canadians are starting to think about putting winter tires on their vehicles. There have been pockets of unseasonable warmth across the country in October and the start of November, the inevitable chill of winter is in the air, and many have already seen snow fall.

While winter tires are recommended throughout the country, they are mandatory in Quebec from December 1st to March 15th, and from October 1st to April 30th on certain British Columbia highways. Additionally, studded tires are allowed almost nationwide, with the exception of residents of Southern Ontario.

Insurance companies across the country offer discounts for installing winter tires as an incentive to encourage drivers to reduce the risk of accidents. So what makes winter tires that much better in the cold and snow than summer tires and where do all season and all weather tires fit into the mix?

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*With the right tools, it can be pretty easy to change your own tires!*

Summer Tires

Summer tires are designed to handle both wet and dry road conditions with their wide tread and soft rubber. These tires also usually have deeper grooves that improve traction on wet roads and reduce hydroplaning, making them ideal for the wet spring and summer months.

Winter Tires

Like their name suggests, winter tires have been designed for winter roads. They are made with rubber that stays flexible at temperatures below 7°C (45°F), the magic number at which other tires become stiff and lose traction, greatly reducing their performance. Furthermore, winter tires have different tread patterns that are meant to divert water and slush to the sides, as well as little slits called sipes that increase the overall grip of the tires and helping them maintain contact with icy road surfaces. Over the past several years, tire manufacturers have started to include additional small particles, like crushed glass or walnut shells, that act as little studs on the surface of the tire for extra grip.

All Season & All Weather Tires

Some people argue that winter tires aren’t necessary if they have all season tires on their vehicle. Unfortunately, this is a slight misnomer because while these tires can handle a bit of cold and snow, they fail to handle heavier snowfalls that are common in Canadian winters. All season tires, unfortunately, sacrifice traction in wet conditions that would be found in summer tires and some of the flexibility and grip seen with winter tires in order for the tread to last longer. Realistically, these should be called 3 season tires as opposed to all season. So while they’re not the best option for winter driving in Canada, all season tires are definitely a better choice than regular summer tires.

All weather tires, not to be confused with all season tires, are a true year-round tire designed to handle Canadian winters. Unlike all season tires, these tires remain soft and flexible well below 7°C. The tread pattern on all weather tires is a combination of all season and winter tires, making them better suited for driving through heavier snow than all season tires. While they still don’t match the performance of a true winter tire, all weather tires are the best option for those who don’t want the hassle of swapping out their tires twice per year or simply do not have the space to store an extra set. Their versatility truly makes all weather tires a middle of the road tire (pun intended) for Canadian drivers.

*The three-peak mountain snowflake symbol found on winter and all weather tires. Image courtesy of* *Canadian tire*.

When looking for tires to get you through the winter, it is recommended to chose either a proper winter tire or an all weather tire, so long as it has the three-peak mountain and snowflake symbol on the sidewall. This is an industry standard symbol which indicates that the tire meets strict regulations for winter performance; becoming mandatory on all winter tires beginning in 2018, transitioning away from just using the M+S (Mud and Snow) designation.

Further Reading

https://www.canadiantire.ca/en/how-to/automotive/how-to-choose-winter-tires.html

https://www.continental-tires.com/ca/en/tire-knowledge/winter-tire-laws-in-canada/

https://www.continental-tires.com/ca/en/tire-knowledge/winter-tire-markings/

https://www.discounttire.com/learn/tires-below-45

https://www.discounttire.com/learn/winter-summer-allseason

Note: The author formerly received payments from “Big Tire” however, this article was not funded.

November 04, 2024

Temperatures to Soar Above 20°C Across Southern Ontario on Tuesday With Gusty Winds

November 04, 2024/ Brennen Perry

As we step into the first days of November, the temperatures outside might have you double-checking the calendar, as the unusually warm trend of this fall continues. This lingering seasonal tug-of-war between cold and warm air has led to temperature swings from near-freezing to over 20°C in the past few weeks.

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Despite the calendar saying November, it’ll feel more like early fall on Tuesday as temperatures rise to around 20°C across much of Southern Ontario. Accompanying this brief warm-up will be strong wind gusts, reaching 70-80 km/h in some areas.

A warm front moving across Southern Ontario is bringing in this surge of mild air, making its presence felt overnight into Tuesday. Already, spots around Lake Erie in southwestern Ontario are feeling this effect, with temperatures climbing near the 20°C mark by Monday evening.

In contrast, parts of Central Ontario and the Ottawa Valley have remained in the single digits, with areas near Ottawa hovering close to freezing. But don’t worry; that’s about to change as warmer air spreads in!

Overnight, temperatures will gradually rise, with most of Southern Ontario waking up to mild conditions in the mid to upper teens. In Central and Eastern Ontario, expect to start the day with temperatures in the lower teens.

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Throughout Tuesday, the warm-up will continue, with daytime highs near 20°C or slightly higher in some areas. The latest data suggests the warmest air will be centred along the Golden Horseshoe and deep southwestern Ontario, including cities like Windsor and Chatham, where temperatures could reach 21-24°C. Some locations may even approach record highs, though with records around 23-25°C in many spots, breaking them might be a tall order.

The rest of Southern Ontario, except for the Bruce Peninsula and northern parts of Central Ontario, will enjoy temperatures around 18-21°C. Northern regions, including Tobermory, Parry Sound, Huntsville, and Algonquin Park, will see slightly cooler temperatures around 15-18°C. Meanwhile, Northeastern Ontario will experience mild conditions, with highs in the low to mid-teens.

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**TEMPERATURES 10-14°C ABOVE SEASONAL**- MAP FROM WEATHERBELL

If 20°C temperatures in November seem strange, you're right! Daytime highs for this time of year are typically in the upper single digits or low teens, so we’re looking at temperatures around 10-14°C above average across Southern Ontario on Tuesday.

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Winds will also be a key feature on Tuesday, with gusts approaching 70 km/h across much of Southern Ontario by the morning. These winds should weaken somewhat later in the day but are expected to pick up again overnight into early Wednesday.

A few areas—particularly around Lake Erie, Niagara, higher elevations east of Lake Huron, and northeast of Georgian Bay—could see stronger gusts up to 80 km/h, although this will be highly localized. Most places should expect gusts around 70 km/h, with winds easing off by late Wednesday morning.

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Northeastern Ontario will see heavy rain beginning early Tuesday morning and lasting through the day and night, with rainfall totals reaching 30-50 mm by Wednesday afternoon in some spots.

Southwestern Ontario will also see moderate to heavy rain starting early Wednesday morning, which will then spread eastward to the Golden Horseshoe and Eastern Ontario by late morning. However, some models indicate that the rain might weaken before reaching Eastern Ontario, resulting in only a few millimeters. Southwestern and Central Ontario could see rainfall amounts of 5-15 mm.

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Wednesday will bring a dramatic change as a cold front sweeps across Southern Ontario, leading to a significant temperature drop by the day’s end. By Wednesday evening, temperatures across much of Southern Ontario will fall sharply into the low to mid-single digits, giving us a reminder that winter is just around the corner.

October 30, 2024

Spooky Skies Ahead! Southern Ontario Could See Warmest Halloween on Record; Up to 10-15cm of Snow Could Haunt Northern Ontario

October 30, 2024/ Brennen Perry

Excitement is brewing as Halloween night approaches, and the streets are set to fill with little ghosts, goblins, and creatures of the night. However, it seems Mother Nature may have skipped the “or” in Trick-or-Treat this year. While Southern Ontario is in for an unusually warm treat, there’s also a wintry “trick” in the forecast, as the first messy winter system of the season stirs up across the northern portion of the province.

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Before we dive into the chilly details, let’s savor the treat: a Halloween night warmer than most! Unlike Halloweens past, where bone-chilling temperatures hovered near or below freezing, this year brings weather that feels more like late summer or early fall. Temperatures across Southern Ontario will keep that warm spell lingering, with some areas possibly experiencing record-breaking highs for Halloween.

In years past, Canadian trick-or-treaters have bundled up with extra layers under their costumes to ward off the cold. This Halloween, they may find themselves shedding layers, with temperatures expected to reach the upper teens and even low 20s in some spots.

Prime trick-or-treating time around 8 PM will bring readings of 16-20°C across much of Southern Ontario, with slightly cooler temperatures between 14-16°C around Algonquin Park and the Bruce Peninsula. Daytime highs earlier in the day may reach the low or even mid-20s, with some areas potentially setting new temperature records.

However, Halloween night won’t stay warm for long. A cold front will sweep through late in the evening, quickly dropping temperatures as it ushers in much colder air overnight. Those celebrating late into the witching hour should brace themselves for temperatures plunging into the single digits by early Friday morning.

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Northern Ontario’s Ghostly Chill

While Southern Ontario basks in warmer weather, the tale turns a bit chillier in Northern Ontario. Southern portions of Northeastern Ontario, including Elliot Lake, Sudbury, and North Bay, will enjoy temperatures between 12-16°C during Halloween evening. But for Central Northeastern communities like Chapleau, Temiskaming Shores, and Kirkland Lake, temperatures will drop to single digits, adding an extra shiver to the festivities.

Northwestern and Far Northern Ontario will already be feeling the effects of the cold front by trick-or-treat time, with temperatures hovering near or just below the freezing mark. In these areas, those venturing out for Halloween night will definitely need to incorporate extra layers into their costumes.

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So, Where’s the Trick?

**PRECIPITATION TYPE FOR Halloween EVENING** - MAP FROM WEATHERBELL

You may be wondering, with all this warm weather, where’s the trick in this Halloween forecast? The trick this year will be what’s coming down from the sky. Scattered rain showers are set to creep into Southern Ontario starting Thursday afternoon, with the heaviest rainfall likely in parts of Northeastern Ontario and along the western areas of Southern Ontario.

In fact, there could even be isolated thunderstorms around Georgian Bay. So if you’re out collecting candy, keep an eye on the skies, and take cover if you see lightning or hear thunder. Trick-or-treaters in Eastern Ontario, on the other hand, might just escape the rain until later in the evening.

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Fortunately, rainfall amounts across Southern Ontario are expected to stay light, with 5-15 mm in areas seeing the heaviest showers. Thunderstorm activity could increase these totals in very localized spots, but nothing overly dramatic.

The heaviest rain will be concentrated in Northeastern Ontario, stretching from Sault Ste. Marie through Sudbury and up to North Bay. Some of these areas are currently under a rainfall warning from Environment Canada, with up to 60 mm of rain possible from Wednesday night through Friday morning.

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A Halloween Surprise: Snow in Northern Ontario!

And now, for the big Halloween scare! As rain moves across Ontario, colder air in the north will bring a chilling twist, transforming rain into snow by Thursday afternoon in some areas. The spooky snowfall is set to begin from Wawa up through Kapuskasing, with heavy snow expected to continue through the overnight hours into Friday morning.

For those areas in the “snow zone,” accumulation could be significant. A corridor stretching from Wawa to Kapuskasing may see up to 10-15 cm of snow by Friday morning, though actual amounts may vary based on temperatures near the freezing mark, which can affect how well snow sticks to the ground.

Surrounding areas, including Wawa, Kapuskasing, Timmins, and Cochrane, could see 5-10 cm of snow accumulation. However, warmer ground temperatures may mean that some snow melts on contact, reducing the totals.

Northeastern Ontario, north of a line from Sault Ste. Marie to Sudbury, may also pick up a dusting to a few centimetres of snow Thursday night into Friday, with up to 5 cm possible. Thunder Bay could even see a few flurries, though no accumulation is expected there.

So, Ontario, prepare for a Halloween that’s part treat, with warm weather for many, and part trick, with rain and snow making an appearance in others. However, you plan to celebrate, have a safe and spooky Halloween night!

October 26, 2024

Spooky Snow May Make an Appearance in Parts of Ontario to Kick Off Halloween Week

October 26, 2024/ Brennen Perry

The month of October has mostly brought calm and mild conditions to Ontario, with temperatures occasionally climbing above seasonal averages and minimal precipitation. But as we approach the final days leading up to Halloween, colder air is making a return, setting the stage for a possible wintry “trick” in parts of the region.

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This past week, temperatures in some areas reached the upper teens and even low 20s, but now a noticeable chill has settled in. Many spots across Southern and Northern Ontario are already experiencing single-digit highs as the warm air retreats.

As the weekend progresses, the cold will only deepen, with Sunday morning expected to bring temperatures near or just below freezing across the province. Afternoon highs will provide little relief, as most places in Central and Eastern Ontario will likely struggle to rise out of the single digits.

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A Weak Weather System and a Chance of Snow

**PRECIPITATION TYPE FOR SUNDAY EVENING** - MAP FROM WEATHERBELL

On Sunday, a weak weather system will begin to make its way into Northeastern Ontario and eventually move toward Central Ontario by the afternoon. This will likely bring some light rain showers to areas like Sault Ste. Marie, Sudbury, North Bay, and Muskoka. As colder air continues to push southward after sunset, temperatures will drop quickly, setting the stage for a possible transition from rain to wet snow in the evening.

While surface temperatures are expected to stay just above freezing until after midnight, colder air moving in aloft may allow the rain to change to snow as the night progresses. Precipitation will gradually spread southeastward, reaching Bancroft, Kingston, and possibly the Ottawa area.

There is some uncertainty about whether Ottawa itself will see any snowflakes, as models suggest that a dry air pocket may limit snowfall, keeping the bulk of moisture just to the south.

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Potential for Accumulation and a Hard Freeze

**ESTIMATED MINIMUM TEMPERATURE ON MONDAY MORNING** - MAP FROM WEATHERBELL

Temperatures will continue to drop overnight, leading to what is referred to as a “hard freeze” in areas like Sudbury, North Bay, Algonquin Park, and the Ottawa Valley. During a hard freeze, temperatures remain several degrees below freezing for extended periods, which could kill sensitive plants.

The drop in temperature may also allow for some light snow accumulation, with a dusting of 2-3 cm possible by Monday morning in some areas. Though not a significant amount, it could be enough to create slippery conditions on roads, making for a potentially slow and hazardous Monday morning commute.

Light flurries may linger across parts of Central and Eastern Ontario into late Monday morning, gradually tapering off around noon. With temperatures hovering close to the freezing mark throughout the day, any snow that does manage to accumulate will likely melt slowly. Motorists should remain cautious, as wet or slushy conditions could persist longer than usual.

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Midweek Warm-Up on the Horizon

**ESTIMATED DAYTIME HIGH TEMPERATURE ON WEDNESDAY** - MAP FROM WEATHERBELL

For those hoping for a break from the cold, a warm-up is expected by midweek. By Tuesday, daytime highs in parts of Southwestern Ontario could rebound into the low to mid-20s, with the warmer air spreading to Central and Eastern Ontario by Wednesday.

However, the return of milder weather may be accompanied by some wet conditions. A fast-moving weather system is forecast to pass through Southern Ontario on Tuesday, bringing the potential for 15-30 mm of rainfall across Central and Eastern Ontario between late Tuesday and Wednesday.

While the exact track remains uncertain, some models suggest the rain may shift further north, potentially impacting the area differently than initially expected.

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What’s in Store for Halloween?

**ESTIMATED TEMPERATURE FOR HALLOWEEN AT 8 PM** - MAP FROM WEATHERBELL

With Halloween fast approaching, many Ontarians are wondering what the weather will be like for Trick-or-Treating. As of now, forecasts indicate a chance of widespread rain across much of Southern Ontario during the afternoon, possibly lingering into the evening. Afternoon temperatures are expected to start in the mid to upper teens, but a cooling trend may bring them down to the low teens or even upper single digits by the time Trick-or-Treaters hit the streets.

There is still some disagreement among models regarding the exact timing of the rain. While it seems the heaviest precipitation may fall earlier in the day, there is a chance that skies could clear in time for the evening festivities, especially in Southwestern Ontario. Meanwhile, Eastern Ontario may be among the last regions to see any potential clearing.

Stay tuned as more details emerge in the days leading up to Halloween, and be prepared for whatever weather “tricks” or “treats” may come your way!

October 23, 2024

Trick-or-Treat: A Potential Spooky ‘Headless’ Comet Could Be Visible Across Canada Around Halloween

October 23, 2024/ Brennen Perry

It's been a spectacular year for skywatchers across Canada, with events like solar eclipses, supermoons, and vibrant northern lights lighting up the night. Now, it looks like we might be in for another treat—a "headless" comet could make an appearance just in time for Halloween.

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October seems to be the month of comets, with Comet Tsuchinshan-ATLAS gracing the early evening skies recently. Many stargazers caught glimpses of the comet, which was visible in the western sky just after sunset. Although it has since faded from naked-eye visibility, you can still catch it with a telescope, and it will remain somewhat visible into early November.

But the cosmic show isn’t over yet. A second comet, called Comet ATLAS (C/2024 S1), may arrive just in time for Halloween, and it comes with a spooky twist—it could appear "headless." The comet’s name might sound familiar because it was discovered by the same ATLAS asteroid tracking system, known for spotting objects that could potentially impact Earth.

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The main difference between this upcoming comet and the earlier one lies in its path. While the first comet passed safely between Earth and the Sun, around 40 million miles from the Sun, this new comet will come much closer, potentially within 700,000 miles of the Sun's surface. Because of this close approach, scientists predict that the comet’s head—its bright core—might disintegrate due to the Sun's intense heat, leaving just a faint, trailing tail visible from Earth.

To understand what makes a comet appear "headless," it's important to know a bit about its structure. Comets are made up of a nucleus, or core, composed of rock, dust, and frozen gases. When they approach the Sun, the heat causes the frozen gases to vaporize, forming a glowing coma around the nucleus and a tail that extends away from the Sun. If the nucleus disintegrates, the glowing head might vanish, leaving behind only a ghostly tail, hence the term "headless comet."

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ESTIMATED BRIGHTNESS OF COMET - SOURCE: sKYWALK.SPACE

The exact visibility of this comet remains uncertain. It will come closest to Earth on October 24th as it travels toward the Sun, reaching its closest point to the Sun, known as perihelion, on October 28th. There’s even a chance it could be bright enough to see during the day, potentially appearing as bright as Venus from 7:12 AM to 8:06 AM (ET) in the east-southeastern sky.

However, those in the Northern Hemisphere may struggle to spot it due to its position low in the sky near the Sun, making it difficult to see without obstruction from sunlight or clouds.

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NASA offers some tips for spotting the comet during this close approach. To view it safely, you should block the Sun with an object such as a building or tree, then scan the lower left of the Sun's position in the sky. Be cautious and never use binoculars or telescopes, as accidentally focusing on the Sun can cause serious eye damage.

If the comet survives its close encounter with the Sun, it could become visible in the night sky around Halloween. This would provide skywatchers with a unique opportunity to see a potentially "headless" comet, with a long, wispy tail but no visible nucleus. The darkness of the moonless night sky could offer ideal conditions for observing this unusual celestial visitor, making it a fitting cosmic event for the spooky season.

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There is always the possibility that the comet disintegrates completely, leaving nothing visible to the naked eye. But if it endures, it will gradually fade after November 1st, requiring binoculars or a telescope for further observation. Unlike earlier this month, when a supermoon washed out the sky, the absence of a full moon could make for an even more impressive show, assuming the comet survives.

Stay tuned for updates as we keep an eye on this intriguing comet.

October 22, 2024

Why the Northern Lights Are Appearing More Frequently: NASA and NOAA Confirm Solar Maximum

October 22, 2024/ Teresa Kroeker

Visible light images from NASA’s Solar Dynamics Observatory highlight the appearance of the Sun at solar minimum (left, Dec. 2019) versus solar maximum (right, August 2024). During solar minimum, the Sun is often spotless. Sunspots are associated with solar activity, and are used to track solar cycle progress. Credit: NASA/SDO

During a recent teleconference, experts from NASA, NOAA, and the International Solar Cycle Prediction Panel confirmed that the Sun has entered its solar maximum, a period of heightened solar activity expected to last through the next year.

The solar cycle reaches this peak roughly every 11 years, during which the Sun shifts from a relatively calm state to a much more active phase characterized by increased magnetic activity and a higher number of sunspots. These sunspots, which are cooler areas on the Sun’s surface caused by intense magnetic fields, can trigger powerful solar eruptions that significantly impact space weather.

This surge in solar activity doesn’t just make for an interesting spectacle; it can also have practical consequences on Earth. Solar flares and eruptions during this time can interfere with communications, disrupt GPS signals, and even affect power grids. They can also pose potential hazards to satellites and astronauts in orbit.

But for skywatchers, there is an upside: the solar maximum period also brings more frequent and spectacular aurora displays. The increased solar storms energize the Earth’s magnetosphere, producing stunning Northern Lights that light up the night sky.

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The Solar Cycle 25 forecast, produced by the Solar Cycle 25 Prediction Panel, which is co-chaired by NASA and NOAA. Sunspot number is an indicator of solar cycle strength - the higher the sunspot number, the stronger the cycle. Credit: NOAA’s Space Weather Prediction Center

This past May, a powerful series of solar flares and coronal mass ejections (CMEs) resulted in one of the most intense geomagnetic storms seen in decades, setting the stage for breathtaking aurora displays visible across Canada. For many, it was a rare opportunity to experience the vivid greens, reds, and purples dancing across the sky.

If you didn’t catch those May displays or other recent aurora events, there’s no need to worry. With the Sun currently in its solar maximum, NASA and NOAA anticipate ongoing solar and geomagnetic storms in the coming months, which means there will be many more chances to witness the auroras.

Although the Sun is already in an active phase, pinpointing the exact peak of this cycle will take time as scientists closely monitor the number and intensity of sunspots and solar eruptions.

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Exciting research efforts are also underway to better understand the Sun's behavior during this dynamic period. NASA is preparing for a major milestone in solar exploration, with the Parker Solar Probe set to make its closest approach to the Sun in December 2024. This mission, along with other initiatives, aims to deepen our knowledge of space weather and its effects on our planet.

Here at Instant Weather, we’re committed to keeping you informed about significant solar activity and providing timely alerts for aurora viewing opportunities across Canada. As the Sun continues to show off during this solar maximum, be sure to stay tuned for updates and get ready for more spectacular light shows in the sky.

October 18, 2024

After a Slow Start, Fall Colours Now Entering Peak Across Southern Ontario

October 18, 2024/ Brennen Perry

An unusually warm start to autumn across Southern Ontario has delayed the typical fall colour transformation, leaving many waiting longer than usual for those vibrant displays. In our last update from early October, peak colours had only been reached in Central Ontario and parts of Eastern Ontario, several weeks later than usual.

However, the colder weather that settled in over the past few weeks has helped speed up the transformation across the region. As we head into the weekend, most areas in Southern Ontario are now approaching or experiencing peak colour change.

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For provincial parks that reached their peak earlier this month—such as Algonquin Park, Arrowhead, and Bonnechere—the best days have likely passed, with reports indicating that fewer than 40% of the leaves remain on the trees.

Note: The above map is extrapolated using data from OntarioParks.ca, but some parks may not have updated their latest report yet. As such, the actual colour change in your area may be further along than currently reported.

Keep in mind that many parks have closed for the season after Thanksgiving, which explains why some areas lack data in our latest updated map.

Currently, the following parks are experiencing peak fall colours:

Arrowhead: 100% colour change | 40% leaf fall
Balsam Lake: 60% colour change | 30% leaf fall
Batchawana Bay: 90% colour change | 40% leaf fall
Bon Echo: 80% colour change | 50% leaf fall
Bronte Creek: 50% colour change | 20% leaf fall
French River: 80% colour change | 50% leaf fall
Killarney: 80% colour change | 40% leaf fall
Killbear: 60% colour change | 30% leaf fall
MacGregor Point: 60% colour change | 40% leaf fall
Mark S. Burnham: 50% colour change | 40% leaf fall
Mono Cliffs: 60% colour change | 20% leaf fall
Oxtongue River-Ragged Falls: 100% colour change | 40% leaf fall
Sauble Falls: 100% colour change | 40% leaf fall
The Massasauga: 90% colour change | 20% leaf fall

The last regions still waiting to reach peak colours are in Deep Southwestern Ontario, along the Lake Erie shoreline, and in parts of the Golden Horseshoe. Parks in these areas, including Pinery, Wheatley, Rondeau, Turkey Point, Darlington, Presqu'ile, and Sandbanks, are reporting between 30-40% colour change. It's likely that these parks will reach peak colours by next weekend.

Remember that peak fall colours typically last for about a week or two, but this can vary based on weather conditions. The peak period ends once more than 50% of the leaves have fallen, which can happen quickly after a strong windstorm. So, make the most of the season and get out there while the colours are at their brightest!

October 15, 2024

Toronto’s Storm of the Century: Remembering Hurricane Hazel 70 Years Later

October 15, 2024/ Alannah Campbell

*Overhead view of Raymore drive in Toronto following hurricane hazel, courtesy of* *Toronto and Region Conservation Authority*.

It was on this day 70 years ago, in 1954, that the now infamous Hurricane Hazel hit Southern Ontario and caused catastrophic damage to Toronto. It is considered the area’s worst natural disaster and has shaped development for years to come. The storm produced winds up to 124km/h and dumped over 200mm of rain in just 24 hours; left 81 people dead and over 4000 families homeless, 1868 of those families in Toronto; and caused over $135 million in damages in Ontario ($1.5 billion by today’s standards). Hazel changed the way conservation authorities operate across Ontario and those impacts are still felt to this day.

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*Hurricane Hazel's Path, October 14-15, 1954, Courtesy of the* *National Weather Service*.

Hurricane Hazel was first identified on October 5, 1954 by a Hurricane Hunters aircraft from Puerto Rico which located it just east of the island nation of Grenada in the West Indies. The plane estimated that the storm was already a Category 2 hurricane with winds estimated at 160km/h, but this value was more recently revised to 105km/h, making Hazel a Tropical Storm at the time, during reanalysis of former hurricane seasons by NOAA. Hazel intensified following the Hurricane Hunters mission and it made its first landfall over Grenada on the evening of the 5th as a Category 1 hurricane with winds estimated at 120km/h.

From there, Hazel tracked west-northwestward off the northern coast of Venezuela for the next few days, gaining strength along the way. Late on October 9th, Hazel gained Major Hurricane status with winds estimated at 195km/h. The next day, the storm made a sharp turn and started churning northeastward, where it eventually made two separate landfalls on Haiti’s west coast, initially over the Tiberon Peninsula as a Category 3 with winds estimated at 195km/h in the pre-dawn hours on the 12th and then as a Category 2 with estimated winds of 160km/h later that same evening over the northern peninsula. Hurricane Hazel killed up to 1000 people in Haiti and devastated the economy, destroying 40% of the nation’s coffee trees and 50% of the cacao crop.

Following its second landfall in Haiti, Hurricane Hazel curled northwestward and made its fourth total landfall in Inagua, an island in the Bahamas, less than 18 hours later on the morning of the 13th. The storm maintained its Category 2 strength between the two landfall occurrences, hitting the Bahamas with winds estimated at 160km/h.

Beyond the Bahamas, Hazel gained speed and reintensified, becoming a Category 4 hurricane on the evening of October 14th. Just before noon on October 15th, Hazel made its fifth and final landfall near the border of North Carolina and South Carolina as a Category 4 hurricane with sustained winds of 215km/h and gusts up to 240km/h. Hazel quickly transitioned to a post-tropical cyclone, but it maintained hurricane-force winds as it quickly pushed through D.C., Pennsylvania, New York, and towards the Canadian border. The storm killed 95 Americans and caused over $1.5 billion of damage by today’s standards.

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*Surface Chart from 8:3pm ET showing the location of Hazel over Southern Ontario, Courtesy of* *the National Weather Service*.

As Hazel made its way northward through the States, Canadian authorities began issuing warnings to the general public, but most people didn’t know how to prepare for a hurricane. The storm began to weaken over the Allegheny Mountains in West Virginia and meteorologists expected it to dissipate, however the opposite happened. Instead, Hazel encountered a low-pressure system over western New York and intensified just before it crossed into the Niagara Peninsula.

Hurricane Hazel was a post-tropical Category 1 storm that brought severe wind gusts of up to 124km/h to a large portion of Southern Ontario on October 15th, but the winds were not the main concern from the storm. By the evening rush hour, the winds began to die down, but according to Chief Meteorologist Brian Turnbull, the worst of the storm was yet to come. The days leading up to Hazel’s arrival were quite wet so when the heavy rainfall began in the late afternoon, it didn’t take long for flooding to begin. Significant deforestation and development on the saturated flood plains across Toronto could not contain the over 200mm of rain that fell in 24 hours which resulted in many rivers overtopping their banks, with water levels rising by up to 8 metres. The Humber River, in particular, became a deadly torrent through the city, washing away roads, bridges, and entire homes. Overall, the storm dumped 181.6 billion litres of rain on the City of Toronto.

In total, 81 people lost their lives from Hurricane Hazel, mostly in the west end of Toronto. Across Southern Ontario, approximately 4000 families lost their homes, 1868 of which were in Toronto. Raymore Drive was hit particularly hard with 14 homes being washed away, killing 35 people. Fortunately, the death toll could have been much worse if not for the heroics displayed by many police officers, firefighters, and ordinary citizens who worked tirelessly trying to save those who became stranded. Sadly, five firefighters lost their lives when trying to rescue trapped motorists.

The effects of Hurricane Hazel were felt beyond Toronto. Significant flooding was experienced in communities as far west as London and north to Georgian Bay as the storm progressed northwards to James Bay, where it eventually dissipated.

*Members of the Harbour Patrol Rescue a man from the Don River, courtesy of* *the Canadian Encyclopedia*.

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In the aftermath of Hurricane Hazel, many changes were made to conservation authorities across Ontario, especially in the Greater Toronto Area.

An intensive plan was put in place by conservation authorities, along with both the municipal and provincial governments, for flood control and water conservation in order to limit loss of life and property from future extreme weather events. As part of this plan, flood control facilities were inspected, upgraded, or built alongside additional dams and reservoirs to control and monitor water levels. A flood forecasting and warning system was also a large component to the plan.

An amendment was made to the Conservation Authorities Act that allowed individual conservation authorities to obtain and control vulnerable areas to be used for conservation and recreation. As a result, many homes were cleared from low-lying areas and greenbelts were created within watersheds. This included the expropriation of most remaining properties on Raymore Drive by the Metro Toronto and Region Conservation Authority which was turned into parkland, now called Raymore Park.

As we look back on the anniversary of this tragic event, we want to remember those that were lost and all of the efforts that have been put in place since to prepare for future extreme weather events. The City of Toronto has seen many flooding events since Hurricane Hazel, and it will continue to do so for many year. However, major floods in 2013 and more recently in 2024 show that more work still needs to be done.

*The G. Ross Lord Dam, One of the Many Flood Control Measures in Place Across Toronto, Courtesy of the* *Toronto and Region Conservation Authority.*

Sources:

https://www.aoml.noaa.gov/hrd/hurdat/hurdat2.html

https://www.heritage-matters.ca/articles/hurricane-hazel-50-years-later

https://www.heritagetrust.on.ca/pages/programs/provincial-plaque-program/provincial-plaque-background-papers/hurricane-hazel

https://www.hurricanehazel.ca/ssi/evolution_flood_control.shtml

https://www.thecanadianencyclopedia.ca/en/article/toronto-feature-hurricane-hazel

https://www.thecanadianencyclopedia.ca/en/article/hurricane-hazel

https://www.trca.ca/news/hurricane-hazel-70-years/

https://www.weather.gov/mhx/Oct151954EventReview

October 15, 2024

Post-Thanksgiving Cool Down to Bring Season’s First Flurries to Parts of Southern Ontario on Tuesday

October 15, 2024/ Brennen Perry

The chill is definitely in the air following the Thanksgiving long weekend across Ontario, with overnight lows hovering around the freezing mark in many areas over the past few days.

This is a sharp change from the mild autumn weather we experienced throughout September, which has led to a noticeable delay in the changing of the leaves. While the trees are still taking their time to show off their fall colors, other signs of the season are on the way over the next few days.

Most notably, the combination of colder air and the warm waters of the Great Lakes will create ideal conditions for lake-effect precipitation to develop off Lake Huron and Georgian Bay.

While most areas will see lake-effect rain, it could get cold enough along the higher elevations of the Dundalk Highlands, south of Georgian Bay, for some wet flurries to appear on Tuesday.

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Additional precipitation is expected to move into Northeastern and Central Ontario by late Tuesday. As temperatures approach the freezing mark, some areas may see a transition to wet snow. However, significant accumulation is not expected, as the snow will likely melt almost immediately due to the warm ground, which remains above freezing.

For those who miss the milder weather, there’s no need to worry—there’s a warm-up on the way as we head into the weekend and early next week. Some areas could see daytime highs reaching the upper teens or even low twenties, which is well above the seasonal average for this time of year.

**PRECIPITATION TYPE DURING THE DAY ON TUESDAY** - MAP FROM WEATHERBELL

On Tuesday morning, most places will wake up to temperatures near the freezing mark, but daytime highs are expected to gradually rise into the mid to upper single digits. The higher elevations around Orangeville and Shelburne may struggle to climb above freezing, holding onto near-freezing temperatures throughout the day.

Lake-effect rain is expected to continue south of Georgian Bay throughout Tuesday, and some wet snow could mix in over the Dundalk Highlands during the day. This potential for flurries will be highly localized to the higher elevations between Owen Sound and Orangeville, while areas outside this region are likely to avoid the season’s first snowfall for now.

With temperatures hovering near or just above the freezing mark, significant accumulation is unlikely, as most of the snow will melt upon contact with the ground. However, there is a chance of a few wet, slushy centimeters in very localized areas.

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**PRECIPITATION TYPE DURING TUESDAY night** - MAP FROM WEATHERBELL

As we move into the evening and overnight hours, temperatures will again drop to near the freezing mark across Central, Eastern, and Northeastern Ontario. With scattered showers arriving from the north and east, there is a possibility that some of this precipitation could fall as wet flurries overnight and into early Wednesday morning.

Accumulation will remain a challenge due to the relatively warm ground. However, those in Huntsville, Algonquin Park, and the Ottawa Valley might catch a glimpse of their first snowflakes of the season. The chance of snow will diminish by late Wednesday morning as lake-effect precipitation weakens and any lingering showers move out of the region.

As mentioned earlier, we’re expecting a gradual warm-up for the rest of the week, though the mornings will still start off chilly, with temperatures in the single digits. The real warming trend will kick off on Friday, with temperatures climbing into the upper teens and possibly even approaching the low twenties in Southwestern Ontario and around the Golden Horseshoe.

This milder weather is expected to continue through the weekend and into early next week.

October 05, 2024

Ontario’s Potential Last Severe Thunderstorm Risk of the Year on Sunday to Usher In a Chilly Start This Week

October 05, 2024/ Brennen Perry

Get ready, Ontario! While we've been enjoying a relatively mild start to fall, aside from a few exceptions, a significant change is on the horizon. As we head into the first weekend of October, it looks like Mother Nature is gearing up to bring in more seasonally appropriate weather. But, true to Ontario's reputation, it won’t happen quietly.

The weekend so far has seen relatively calm weather across Southern Ontario, with many areas enjoying pleasant temperatures in the mid to upper teens. This marks a shift from the consistent 20°C-plus days we experienced through much of September. While it's been nice, things are about to take a turn. We’re expecting a sudden surge of warmer air on Sunday, and that warm-up could set the stage for some potentially severe weather as we move into the morning and afternoon hours.

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This brief October "heatwave" could push temperatures close to 20-25°C in Deep Southwestern Ontario and across the Golden Horseshoe. For those of you in Central and Eastern Ontario, however, don’t expect to feel much of this warmth. A stubborn pocket of cooler air is going to dig in, holding temperatures in the mid-teens across that region, keeping it much cooler than the rest of the province.

Unfortunately, this warm-up isn’t all sunshine. It will come hand-in-hand with some unsettled weather. A potentially strong line of thunderstorms is expected to cut across Southern Ontario on Sunday morning and afternoon. The latest data suggests that this line of storms could develop over Lake Huron by late morning and track eastward, making its way onshore just east of Lake Huron and Georgian Bay.

**SIMULATED RADAR @ 12 PM ON SUNDAY** - MAP FROM WEATHERBELL

There is still some uncertainty regarding the intensity of these storms. The early timing and limited warm air this far north may impact how severe the storms get. However, the atmosphere seems primed to support at least a marginal severe threat. We could see strong wind gusts, potentially reaching 90 km/h, and even hail up to quarter-size. There’s also a possibility that the risk level could be upgraded to slight by morning if conditions appear more favourable.

There is a low tornado risk—while it can’t be completely ruled out, the messy, linear storm structure might limit the chances of an isolated tornado forming. Still, it’s always better to stay cautious when severe weather is in the forecast.

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This line of storms will continue pushing eastward through the Golden Horseshoe and areas east of Lake Simcoe by early to mid-afternoon. There’s potential for some intensification as the day progresses, or we could even see additional storms developing in the wake of the initial line. The zone between Bancroft, Peterborough, and Durham Region, and possibly stretching into Niagara, seems to have the highest risk for severe weather, should the conditions align more favourably.

By the late afternoon, the bulk of the storm activity will shift into the United States, where further severe weather could develop over Upstate New York and Pennsylvania. As a result, the storm threat across Southern Ontario should rapidly diminish by early evening. Given the time of year and the fact that cooler weather is set to follow, it’s quite possible that this could be our last widespread severe weather event of the season.

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**ESTIMATED TEMPERATURE @ 7 AM ON TUESDAY** - MAP FROM WEATHERBELL

Speaking of cooler weather, expect a noticeable drop in temperatures as we start the new week. By Monday and Tuesday, much of Southern Ontario will feel the chill, with daytime highs struggling to climb into the mid-teens.

Central and Eastern Ontario could be even cooler, with some areas potentially stuck in single-digit highs. The nights will be even colder. On both Tuesday and Wednesday mornings, some regions in Central and Eastern Ontario could dip below 0°C, bringing a risk of frost for a large portion of Southern Ontario.

At this point, we’re not expecting s-word to enter the forecast this week at least in Southern Ontario, but the cold snap will certainly make it feel like fall has truly arrived. So, if you’ve been holding off on packing away your summer wardrobe, it might be time to start thinking about those cozy sweaters and heavier jackets.

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**LONG RANGE TEMPERATURE FORECAST FOR THANKSGIVING SUNDAY - NOTE: THIS WILL LIKELY CHANGE!** (MAP FROM WEATHERBELL)

However, there might be some good news as we look ahead to the Thanksgiving long weekend. Early indications suggest a potential return of warmer air by next weekend, bringing with it another temperature boost. Some models hint at temperatures pushing 20°C once again in parts of Southern Ontario, which would be quite a surprise for Thanksgiving, given that we’ve seen flurries on the holiday in previous years!

It’s still too early to say for sure, though, as the forecast could change over the coming days. But for now, we’ll remain optimistic about the possibility of a pleasant, mild Thanksgiving weekend. As always, we’ll be monitoring the situation closely and will provide a more detailed Thanksgiving preview later this week.

October 03, 2024

Fall Colours Reach Peak in Parts of Southern Ontario Heading Into First Weekend of October

October 03, 2024/ Brennen Perry

Fall colours have been slow to arrive in parts of Southern Ontario due to a relatively mild September, but as we move into the first weekend of October, the transformation is starting to take hold. Several parks are now within their 'peak' fall colours range, providing excellent viewing opportunities.

The best spots to see the vibrant colours this weekend will be in Central and Eastern Ontario, as well as Bruce County along the Lake Huron shoreline. Many parks in these areas are showing between 40-50% colour change, with some even nearing full transformation!

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All provincial parks in Southern Ontario are reporting at least 10% colour change, indicating that the seasonal shift is well underway. However, it could take another week or two for many areas to reach their 'peak.'

With Thanksgiving just around the corner, it’s likely that much of Southern Ontario will be hitting its peak fall colours, making it the perfect time to enjoy the beauty of the season during the long weekend.

For those wondering, 'peak' fall colours occur when at least 60% of the leaves have changed. Based on this, Algonquin and Mikisew Parks are officially in their peak, though this won’t last long. Mikisew is already reporting 70% of its leaves have fallen, so Algonquin might be a better option for now, with only 20% leaf fall reported.

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Several provincial parks are currently showing between 40-50% colour change, mostly in Central and Eastern Ontario:

Arrowhead (50%)
Charleston Lake (50%)
Frontenac (50%)
MacGregor Point (50%)
Sturgeon Bay (40%)
Darlington (40%)
Turkey Point (40%)
Murphys Point (40%)
Bon Echo (40%)
Silent Lake (40%)
Driftwood (40%)

These parks are offering good chances to catch the fall display, and since the data can be a few days old, they may already be approaching peak colours by the weekend.

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The remaining parks in Southern Ontario are reporting 20-30% colour change, especially around Lake Ontario and Southwestern Ontario near Lake Huron.

Parks like Pinery, Awenda, Presqu’ile, Forks of the Credit, and Port Burwell are still at about 10%, but with cooler fall weather settling in, this will likely change quickly in the coming days. The peak for these parks is expected to arrive in 10-15 days, just in time for Thanksgiving weekend or shortly after.

Stay tuned for more updates as we continue to track the progress of fall colours across Southern Ontario!

October 02, 2024

‘Strong’ Geomagnetic Storm Takes Aim at Earth; Northern Lights May Dazzle the Skies Across Canada on Thursday & Friday

October 02, 2024/ Brennen Perry

One of the most powerful solar flares in recent years erupted from the sun on Tuesday evening, classified as an X7.1 flare. Initially, it was unclear whether this flare had produced a coronal mass ejection (CME), which is a large expulsion of plasma and magnetic field from the sun’s corona.

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However, data that came in later confirmed that a CME was indeed produced and, more importantly, appears to be Earth-directed. This means that the CME is expected to impact our planet, setting off the possibility of a ‘strong’ geomagnetic storm and potentially bringing the northern lights much farther south than usual across Canada to close out the week.

#BREAKING: A powerful X7.1 solar flare is currently erupting from the sun, making it one of the strongest flares we’ve seen in recent years.

We’re still waiting for confirmation on whether an Earth-directed coronal mass ejection (CME) is associated with this flare. If there is,… https://t.co/V5kpdUJDmn
— Instant Weather Ontario ⚡️ (@IWeatherON) October 1, 2024

The exact timing of the CME's arrival, however, remains somewhat uncertain. Forecast models suggest it could arrive anywhere between late Thursday and early Saturday. The CME might even come in multiple waves, according to the latest data.

If this happens, we could be in for two consecutive nights of auroras lighting up the skies—if the conditions align perfectly! While the Northern Lights are never guaranteed, the next couple of nights offer a decent chance to catch a breathtaking display, depending on where you are located.

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The Space Weather Prediction Center (SWPC) has issued a Geomagnetic Storm Watch, with the CME expected to reach Earth between Thursday and Saturday. Based on the latest observations, this CME could trigger G1 (minor) to G3 (strong) geomagnetic storm conditions.

The SWPC’s latest forecast predicts that a 'strong' (G3) geomagnetic storm may unfold late Thursday evening into the early overnight hours, followed by a potentially more prolonged geomagnetic storm ranging from ‘moderate’ (G2) to ‘strong’ (G3) on Friday night into Saturday morning.

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A G2 to G3 storm is strong enough to make the northern lights visible across much of Canada, especially if conditions are just right. In the past, storms of this magnitude have allowed the auroras to be seen as far south as Southern Ontario, and in some cases, even into the northern United States. In fact, the SWPC notes the possibility of the auroras being visible as far south as parts of the lower Midwest and Oregon in the U.S.

That said, space weather forecasting comes with some inherent uncertainty. The exact timing of a CME’s arrival can vary, and its intensity is often unknown until a few hours before it strikes Earth. There is usually a 12- to 24-hour window for the CME’s arrival, which means that although the current forecast favours North American viewing on Thursday and Friday nights, the event could just as easily occur during daylight hours, rendering it invisible to viewers in North America and giving those in Europe a better chance at catching the show instead.

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Aside from timing, cloud cover will also be a crucial factor in determining whether you'll have a good view of the northern lights. As of now, fairly clear skies are expected across much of southern Canada on Thursday night. Specifically, areas of Atlantic Canada, Southern Quebec, and Southern Ontario are forecasted to have little to no cloud cover during the overnight hours, which is ideal for aurora viewing.

Further north, however, there could be widespread cloud cover that might obstruct the view around James Bay in Northern Ontario and Quebec. Similarly, Northwestern Ontario could see some cloudiness, with the exception of a pocket near the International border around Thunder Bay.

In Southern Manitoba, skies look clear south of the Interlake region, though clouds will likely impact Northern Manitoba and Saskatchewan.

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For Western Canada, Southern Saskatchewan and Southeastern Alberta are expected to have the clearest conditions. Meanwhile, much of British Columbia, along with central and northern Alberta, could see cloud cover that may limit visibility.

Check out our free app, Instant Weather for a more in-depth cloud coverage forecast specific to your exact location.

If you’re planning to watch for the auroras, another factor working in your favour this time around is the moon phase. Unlike last month’s aurora event, the moon is currently near 0% full, as we’ve just had a new moon on Tuesday night. This means that there won’t be any moonlight competing with the northern lights, making it easier to spot even faint auroras.

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When it comes to where the northern lights might be visible, it all depends on the strength of the geomagnetic storm and how it interacts with Earth’s magnetic field. Historically, during a 'strong' (G3) storm, auroras are most visible across northern Canada, including Northern Quebec, Far Northern Ontario, the Prairies, and parts of British Columbia. In these regions, the northern lights could be visible overhead and bright enough to see with the naked eye.

In southern regions, including Northeastern Ontario (Sault Ste. Marie, Sudbury, and North Bay), as well as parts of Quebec, there’s a chance of seeing the auroras overhead or just above the horizon.

This could extend into northern parts of Southern Ontario, including Muskoka, Algonquin Park, and the Ottawa Valley. However, depending on the storm's strength, auroras may only be visible along the northern horizon, and you might need a camera to capture them, as they may not be strong enough for the naked eye.

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For the rest of Southern Ontario and into Atlantic Canada, if the auroras appear, they will likely be on the northern horizon. Here, too, you may need a camera or smartphone to capture the lights, as they may be too faint to see without assistance.

Remember, light pollution can greatly impact your ability to see the northern lights, especially in urban areas. For the best viewing experience, it’s essential to get away from city lights. A resource like DarkSiteFinder can help you locate areas with low light pollution for optimal aurora viewing.

Northern Lights Timing

Many are accustomed to the precise scheduling of weather events, from thunderstorms and winter weather to solar eclipses, where timing is crucial. It’s understandable, then, that there’s a desire for a similar pinpoint timing for the best viewing of the aurora. However, the reality of predicting the best time to view the northern lights is not so straightforward.

Here’s the deal: Unlike weather events driven by terrestrial conditions, the aurora is influenced by solar activity, which is far less predictable. We can estimate that the northern lights are best viewed from just after sunset to just before sunrise, provided the skies are dark and clear. Beyond that, precise timing for peak aurora activity is challenging to forecast with current technology.

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Space weather forecasting doesn't yet allow us to predict exactly when solar energy will impact Earth. We know it's coming, but how and when it interacts with our planet's magnetic field can vary. Often, we only have a few hours' notice before the solar energy is detected by satellites.

Furthermore, the intensity of the northern lights can fluctuate significantly over short periods. You might have noticed this variance if you've observed the lights before—periods of dim activity suddenly bursting into vibrant colors. This is due to the variable concentration of solar particles interacting with our atmosphere.

While we can inform you a few hours ahead when conditions are likely to be good, predicting the exact peak of aurora activity is akin to forecasting the peak of a meteor shower; we know the best night but not the best hour.

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September 27, 2024

After Devastating the Southeastern United States, Is Helene Coming to Canada?

September 27, 2024/ Alannah Campbell

*Satellite Image of tropical storm Helene from September 27th at 10:21am EDT, Courtesy of* *Colorado state university*.

After making landfall as a major Category 4 Hurricane late last night and its subsequent path of destruction across Florida, Georgia, and the Carolinas, many in Ontario are wondering if we will feel the impacts of Helene closer to home over the weekend. Helene has since weakened to a tropical storm, but it remains a massive storm with far reaching impacts.

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Helene has made its way well inland over the past 12 hours, with its low pressure centre currently situated over the Southern Appalachians. Despite still being located so far south, light cloud cover from the storm has made its way into Southwestern Ontario and the Niagara Region. This cloud cover has been responsible for a fabulous display of sun halos across the region this morning!

The storm will continue to gradually track to the northwest this afternoon before stalling out over the Tennessee Valley overnight, where it will encounter and merge with another low. The lack of motion in the storm will unfortunately bring even more rainfall and further exacerbate the extreme flooding and landslide situation already being seen throughout the Southern Appalachians and bring that into the Ohio and Tennessee Valleys.

In Ontario, the cloud cover from Helene will push deeper into the province this afternoon and light rain can be expected in Southwestern Ontario, from Windsor through London and into Niagara, beginning overnight tonight and continuing through the weekend. Much of the rest of Southern Ontario can expect a dreary weekend as the cloud cover settles in.

The storm will actually travel in a loop, known as the Fujiwhara Effect, while it merges with the second low and by Sunday, it is expected to finally start moving eastward towards the Atlantic and then northeastward along the Eastern Seaboard, where it expected to begin to dissipate.

Forecast Tracks from different models for Helene, Courtesy of Tomer Burg.

September 25, 2024

Isolated Storms Could Bring Tornado Risk to Central Ontario and GTA on Wednesday

September 25, 2024/ Brennen Perry

As we near the end of what has been a relatively quiet month for weather across Southern Ontario, we’ve been locked in a pattern of calm conditions and unseasonably warm temperatures. But now, as we enter the first week of autumn, a shift is on the horizon!

Rainy weather has returned across much of Southern Ontario over the past few days, and unsettled conditions are expected to continue into Wednesday. There’s also potential for severe weather during the late morning, extending into the afternoon.

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RAINFALL WARNING (IN GREEN) ISSUED BY ENVIRONMENT cANADA

We’re already seeing pockets of heavy rain and thunderstorms overnight, which are expected to persist until sunrise. Environment Canada has issued rainfall warnings for some areas, where localized amounts of up to 50 mm are possible.

While it's uncertain, some models indicate a slight tornado risk in the morning, particularly around the Golden Horseshoe and Niagara Region. Though this is unlikely, it’s still worth noting.

The timing of when these overnight storms clear out will be key in determining the risk for later in the morning and afternoon. According to the latest models, most storms should dissipate by sunrise, allowing the atmosphere to become more unstable heading into the late morning.

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From around 11 AM through early afternoon, conditions could become favorable for isolated thunderstorms. The strongest setup is expected around Lake Simcoe, extending into the Muskoka and Haliburton regions.

While most storms are expected to remain non-severe, there is a chance of isolated tornadoes, along with marginally severe wind gusts and hail up to the size of quarters.

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The Greater Toronto Area and Niagara Region are under a marginal risk for severe weather, primarily due to the potential for an isolated tornado during the afternoon and early evening. This marginal tornado risk also extends into Algonquin Park and parts of southwestern Quebec.

It’s important to keep in mind that this forecast has a high bust potential—some models show little storm development during peak hours of instability. This forecast assumes storms will develop during the afternoon, but we may need to update and downgrade the risk in the morning if it looks less likely that storms will form.

September 22, 2024

First Day of Autumn Arrives as Central and Eastern Ontario Approaches Peak Fall Colours

September 22, 2024/ Brennen Perry

As we entered September, it seemed like Mother Nature was eager to shift from summer to fall, with temperatures dropping to near freezing and even some northern areas witnessing the first snowflakes of the season.

But since then, the weather has taken a complete 180. Over the past few weeks, Southern Ontario has experienced a consistent pattern of above-seasonal temperatures and minimal precipitation. This unusual warmth for this time of year has slowed down the transition to fall colours across the region.

With the Autumn Equinox taking place early Sunday morning, we are officially in autumn, both meteorologically and astronomically. As we move deeper into the season, we’re starting to see some notable shifts in fall foliage, especially in Central and Eastern Ontario, according to the latest data.

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If you're looking to catch the fall colours this week, your best bet is to head to higher elevations in Central and Eastern Ontario. Provincial parks such as Mikisew, Algonquin, and Bon Echo are reporting that around 40% of the leaves have started their transformation. The higher elevations experience slightly cooler overnight temperatures, which accelerates the colour change compared to other areas.

The ‘peak’ fall colours occur when at least 60% of the leaves have changed. With these parks now at 40%, we’re likely just a week or two away from peak viewing, perhaps as early as next weekend.

We’re also seeing some colour change along the Bruce Peninsula and throughout many parks in Central and Eastern Ontario, where about 30% of leaves have started changing. This includes parks like Sauble Falls, Arrowhead, Sturgeon Bay, Silent Lake, Frontenac, and Murphys Point.

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For the rest of Southern Ontario, there is some minor colour change being reported, with 10-20% of leaves beginning to turn. However, peak colours are still several weeks away in these areas.

An important note: The calm weather over the past few weeks has allowed trees to hold onto most of their leaves. Without any significant wind events, the leaf fall percentage is averaging around 10-20%. If these calm conditions continue, we should see a vibrant display of colours in the weeks ahead.

Looking at the medium to long range forecast, we’re expecting slightly above-seasonal temperatures to continue through the rest of September. This could mean peak fall colours might arrive later than usual this year, although it’s hard to say for certain. We do anticipate more active weather this week, with several rounds of heavy rain possible, which could potentially knock some leaves off the trees.

September 15, 2024

Eyes to the Sky! Northern Lights Could Make an Appearance Across Canada on Monday

September 15, 2024/ Brennen Perry

A powerful solar flare, reaching an impressive X4.5 rating, erupted on Saturday, sending an Earth-directed coronal mass ejection (CME) into space. This CME is expected to impact our planet, sparking geomagnetic storm conditions that could bring the northern lights much farther south than usual across Canada on Monday.

As with most space weather events, there is some uncertainty regarding the exact timing of the CME's arrival. According to the latest data, the strongest storm conditions are anticipated during the mid to late morning hours on Monday, gradually weakening throughout the day. This suggests the best viewing opportunity for the auroras may occur in the pre-dawn hours, particularly in Western Canada.

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However, this isn’t set in stone. Space weather forecasting can be tricky, and the CME might arrive later than expected, which would actually be the ideal outcome for North American skywatchers. A delayed arrival could mean a spectacular display of the northern lights over large portions of the country on Monday night.

The Space Weather Prediction Center (SWPC) is forecasting a "strong" geomagnetic storm (G3 on a scale of 5) to develop sometime on Monday. A G3 storm is potent enough to make the northern lights visible across much of Canada, provided the conditions align just right.

Historically, storms of this strength have allowed auroras to be seen as far south as Southern Ontario, and sometimes even into northern parts of the United States. In fact, the SWPC mentions the possibility of auroras being visible as far south as Pennsylvania and Iowa.

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Based on the SWPC’s latest forecast, the geomagnetic storm is expected to peak between 5 AM and 11 AM EDT (2 AM to 8 AM PDT). A moderate (G2) storm is projected to continue through the day, potentially lasting until 11 PM EDT (8 PM PDT).

If this timing holds, the best chances to witness the northern lights would be in Western Canada during the early morning hours on Monday, when the storm is at its peak. Unfortunately, for those in Ontario and Quebec, the storm may hit after sunrise, reducing the likelihood of a good aurora display.

That said, if the CME arrives later in the day, it could extend the storm into Monday night, offering a better chance for Eastern Canada to catch the auroras, assuming clear skies.

Speaking of skies, Monday night’s cloud forecast looks promising for much of Canada. The latest model shows most areas should have a good view, with only Southeastern Manitoba, Northwestern Ontario, and Northern Quebec facing potential cloud cover that might obscure the show.

Southern Saskatchewan and Northern Alberta may see patchy clouds but could have breaks offering decent aurora visibility. For Southern Ontario, Quebec, and most of Western Canada, skies are expected to remain clear.

Check out our free app, Instant Weather for a more in-depth cloud coverage forecast specific to your exact location.

Another potential issue will be the full moon leading to the possibility of the northern lights appearing more dim and harder to spot. However, if the storm is as strong as forecasted, there still should be some chance to capture the show despite the bright moon.

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Northern regions of Canada, especially Northern Quebec, the Prairies and British Columbia, are almost guaranteed to see the northern lights, except for areas in Southwestern BC near Vancouver where visibility is less certain.

Zooming into more southern regions, the likelihood of seeing auroras becomes more variable. Northeastern Ontario, including Sault Ste. Marie, Sudbury, and North Bay, along with Western and Northern Quebec, have a strong chance of aurora sightings.

In Central Ontario, places like Muskoka, Algonquin Park, Bancroft, and the Ottawa Valley also have a moderate chance, as do areas around Montreal. However, the timing of the storm’s arrival remains a key factor—if it’s delayed and peaks closer to sunset, a G3 storm would likely provide an opportunity for these regions to witness the lights.

In Southwestern Ontario, the Golden Horseshoe, and southern Quebec near the American border, the probability becomes more uncertain. There’s a low to slight chance of auroras being visible here, depending on whether the storm overperforms or peaks later in the night.

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It’s important to keep in mind that light pollution can drastically affect your ability to see the northern lights. Urban areas, in particular, can drown out the skies, so you’ll need to find a dark spot away from city lights for the best chance to see the show. A resource like DarkSiteFinder can help you locate areas with low light pollution for optimal aurora viewing.

Northern Lights Timing

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September 11, 2024

Smoky Skies Ahead as Upper-Level Wildfire Smoke Sets In Across Ontario

September 11, 2024/ Brennen Perry

Over the weekend, Ontario experienced an early taste of late fall weather, with flurries making an appearance in parts of Northern Ontario. Meanwhile, out west, temperatures have been heating up, fuelling a resurgence of wildfire activity.

Now, this same weather pattern has shifted into Ontario, bringing rising temperatures along with increased wildfire smoke from out west including fires in Saskatchewan and Alberta. With a stagnant air mass in place, the smoke is expected to linger over the next few days.

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The good news is that most of this smoke will remain high in the atmosphere, resulting in limited impacts on air quality. However, some minor smoke may reach the surface, which could affect those sensitive to air pollution. The most noticeable effect of the smoke will be at sunrise and sunset, creating a striking orange-red hue in the sky.

We began seeing smoke move into the region late Wednesday, and it’s expected to thicken overnight into Thursday. By sunrise, two pockets of heavy smoke are forecast over Southern and Northwestern Ontario.

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Throughout Thursday, the smoke will continue to blanket the skies, with the densest areas concentrated over Northern, Central and Eastern Ontario. Expect a stunning sunset on Thursday evening—perfect for photography!

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By Friday morning, the air mass will begin to shift westward, gradually clearing the smoke near the Manitoba border. However, Northeastern and Southern Ontario will likely remain under smoky conditions through Friday.

The heaviest smoke on Friday is expected along the Lake Superior and Georgian Bay shorelines.

Aside from the smoke, conditions will be ideal for this time of year, with above-average temperatures settling in across Ontario. This warm trend is expected to continue in the short term, with mild temperatures forecast into next week.

September 06, 2024

Snowy Surprise: Parts of Ontario & Quebec Could See Season’s First Snowflakes This Weekend

September 06, 2024/ Brennen Perry

As we enter the first full weekend of meteorological fall, Mother Nature is set to deliver a taste of autumn across Ontario and Quebec. A brief blast of cold air will cause temperatures to drop near the freezing mark during the pre-dawn hours on Saturday and Sunday.

Precipitation currently affecting Southern Ontario is expected to linger throughout the weekend. The heaviest rainfall totals are expected overnight Friday into early Saturday in Eastern Ontario, with localized amounts of 20-40 mm of rain possible.

The bigger story is when that precipitation wraps around into Western Quebec and Northeastern Ontario later on Saturday, continuing into the early morning hours of Sunday. With temperatures cooling into the low single digits and even colder air aloft, some of that precipitation may fall as wet snow.

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It appears that locations like Timmins, Cochrane, Kirkland Lake, Temiskaming Shores, Deep River, and Algonquin Park in Ontario could see their first snowflakes of the season. In Quebec, areas such as Ville-Marie, Rouyn-Noranda, Amos, and Val-d'Or may also experience wet snow.

While it's unlikely that snow will accumulate, as it will be mixed with rain and ground surfaces are still too warm, there's a chance that colder-than-expected conditions could lead to a few slushy centimetres in some areas. Any accumulation will melt quickly after sunrise on Sunday as temperatures gradually rise.

Speaking of Sunday morning, this is when the coldest air of this brief "cold snap" is expected across Ontario and Quebec. Morning lows will likely drop into the single digits across much of Northern and Southern Ontario and Quebec. In Northeastern Ontario and the Algonquin Park region, temperatures could dip to near freezing during the pre-dawn hours, increasing the risk of frost in addition to the potential for wet snow.

Further south, the coldest temperatures in Southern Ontario will be in the higher elevations of Central Ontario, east of Muskoka, where temperatures may plunge to around 2-5°C. It will be moderately warmer in Southwestern Ontario, the Golden Horseshoe, and Eastern Ontario, with morning lows ranging from 5-10°C. Those along the shorelines of Lake Ontario, Lake Erie, Lake Huron, and Georgian Bay will benefit from the warmer lake waters, keeping temperatures above 10°C.

In Quebec, expect low to mid-single-digit temperatures in the western portion of the province near the Ontario border on Sunday morning. Eastern Quebec, including Montréal and Québec City, will see lows in the upper single digits, ranging from 6-12°C.

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WATERSPOUT RISK FOR GREAT LAKES ON SATURDAY MORNING (SORUCE: ICWR)

This cold air will also contribute to a potential waterspout outbreak over the Great Lakes this weekend. The highest risk is on Saturday, especially in the morning and afternoon, with a focus on Southern Lake Huron and Western Lake Erie. Waterspouts are also possible over Southern Georgian Bay, Western Lake Ontario, and even Lake Simcoe.

While waterspouts rarely threaten land, they can be hazardous for those on the water. In rare cases, waterspouts can come ashore, causing minor damage along the immediate shoreline.

The waterspout risk will persist into Sunday, with a focus on Eastern Lake Ontario.

Looking ahead to next week, warmer weather is expected to return to Ontario and Quebec. By late in the week, temperatures could climb back near the 30°C mark in Southern Ontario. So, while this brief taste of fall may be shocking, it looks like summer isn't quite finished yet.

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Toronto’s Storm of the Century: Remembering Hurricane Hazel 70 Years Later

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‘Strong’ Geomagnetic Storm Takes Aim at Earth; Northern Lights May Dazzle the Skies Across Canada on Thursday & Friday

Northern Lights Timing

After Devastating the Southeastern United States, Is Helene Coming to Canada?

Isolated Storms Could Bring Tornado Risk to Central Ontario and GTA on Wednesday

First Day of Autumn Arrives as Central and Eastern Ontario Approaches Peak Fall Colours

Eyes to the Sky! Northern Lights Could Make an Appearance Across Canada on Monday

Northern Lights Timing

Smoky Skies Ahead as Upper-Level Wildfire Smoke Sets In Across Ontario

Snowy Surprise: Parts of Ontario & Quebec Could See Season’s First Snowflakes This Weekend

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