Alberta Clipper to Bring a Snowy Blast to Southern Ontario on Wednesday With Up to 20cm Possible; Snowbelt Region Could See Up to 50cm

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The snowy landscape across Southern Ontario is quickly transforming as a multi-day snow squall event has blanketed parts of the snowbelt regions with over 100 cm of snow.

While the intense accumulation has primarily impacted areas around Lake Huron and Georgian Bay, the rest of Southern Ontario will soon have their turn as a weather system moves into the region on Wednesday.

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This system-related snowfall will likely combine with lake enhancement and embedded snow squalls, resulting in higher accumulations in the snowbelt areas that are still digging out from the weekend’s relentless snowfall.

By Thursday morning, some snowbelt regions could see an additional 30-50 cm of snow. Meanwhile, a general 5-15 cm of snow is expected across much of Southern Ontario, including parts of the Greater Toronto Area (GTA), which has experienced minimal snowfall so far this season.

The Alberta clipper responsible for this system began pushing into Northwestern Ontario from Manitoba on Tuesday afternoon. Moderate to heavy snow will continue spreading across Northern Ontario through the evening and overnight.

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In Northern Ontario, we expected the highest snowfall totals to be found east of Lake Superior stretching from Wawa down to Sault Ste. Marie. Snowfall totals of between 30 to 50cm are possible thanks to the system-related snowfall and snow squalls off Lake Superior.

Other areas around the Georgian Bay shoreline extending into Sudbury could be looking at around 20cm of snowfall accumulation. This will also be the case south of Lake Nipigon which could see some lake enhancement between Thunder Bay and Geardton.

The rest of Northeastern Ontario is looking at around 10 to 15cm with locally up to 20cm. Less than 10cm is expected for Northwestern Ontario including Thunder Bay.

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Ahead of the system, lake effect snow has already started to intensify, beginning with Lake Superior on Tuesday afternoon. By Tuesday evening, snow squalls are expected to organize off Lake Huron and Georgian Bay, primarily targeting the Bruce Peninsula and areas northeast of Georgian Bay, such as Parry Sound, Britt, and North Bay. These snow squalls are likely to persist through the night into Wednesday morning.

Additional lake effect snow could develop off Lake Erie and Lake Ontario during the early morning hours of Wednesday, potentially drifting into the southern Niagara region and Prince Edward County. While this activity may cause reduced visibility and locally heavy snowfall, the squalls are not expected to remain stationary for long, limiting overall accumulation.

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As the system reaches Southern Ontario around sunrise on Wednesday, the existing lake effect snow bands are expected to merge with the system’s light to moderate snowfall. This merging could enhance snow totals, particularly off the northern shorelines of Lake Erie and Lake Ontario. Narrow bands of heavy snow could stretch across the Niagara region and into parts of Central and Eastern Ontario, leading to significant variations in snowfall accumulations.

Snow totals will likely vary substantially due to localized banding caused by lake enhancement. Some areas may see only 5 cm, while nearby locations could receive 15-20 cm, depending on where the snow bands develop.

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Another key factor with this system will be strong wind gusts, ranging from 50-70 km/h across Southern Ontario, beginning Wednesday morning and continuing throughout the day. These winds, combined with steady snowfall, could create blowing snow and reduced visibility, making travel hazardous. With this being the first significant snowfall event of the season outside the snowbelt, drivers are urged to exercise caution.

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While the system is expected to exit Southern Ontario by late Wednesday, snow squall activity will persist off Lake Huron and Georgian Bay. An intense squall is projected to develop off Georgian Bay late Wednesday evening, stretching inland toward Midland, Orillia, and Gravenhurst, and continuing into the early hours of Thursday.

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By Thursday morning, shifting winds will push the Georgian Bay squall southward toward Collingwood and Angus. This squall may extend far inland at times, impacting the Highway 400 corridor between Vaughan and Barrie, as well as parts of the northern GTA. Meanwhile, a Lake Huron squall is anticipated to stretch from Goderich through Grand Bend and into the London area.

Significant snowfall could occur on Thursday if these squalls remain stationary for an extended period. Current models suggest they may not weaken until late Thursday night or early Friday morning, potentially producing intense snowfall rates for over 24 hours.

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Regarding snowfall totals, the uneven distribution caused by lake enhancement means localized accumulations will vary widely. The highest confidence lies in regions northeast of Georgian Bay, including Parry Sound, Sundridge, Britt, and North Bay, where 30-50 cm of snow is expected, with localized amounts possibly exceeding those totals due to snow squalls.

Surrounding areas, such as Muskoka and Orillia, could see 20-30 cm of snow by Thursday morning, accounting for system snow, lake enhancement, and snow squall activity. Similarly, areas east of Lake Huron could see totals ranging from 20-30 cm.

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In Central and Eastern Ontario, widespread snowfall is likely to range from 10-15 cm, except for the Ottawa Valley, where accumulations may be closer to 5 cm. Lake enhancement could push some areas along the northern shorelines of Lake Ontario and Prince Edward County closer to 20 cm.

For regions such as Kitchener, Woodstock, Guelph, and Barrie, snowfall totals are projected to reach 10-15 cm. However, variability due to lake enhancement may result in some areas seeing lower amounts. The GTA is expected to receive closer to 5 cm, while the Niagara region could accumulate 5-10 cm, with localized heavier bands of snow influenced by Lake Erie.

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In Deep Southwestern Ontario, snowfall amounts will decrease westward, with London forecasted to receive around 10 cm. Further southwest, including Sarnia, Windsor, and Chatham, totals are expected to remain under 5 cm.

It’s important to note that these totals do not account for the snow squalls expected to impact areas southeast of Lake Huron and Georgian Bay beginning Thursday morning. High-resolution models are still refining the locations of these squalls, but additional accumulations of 30-50 cm are possible in affected areas. Stay tuned for a detailed update in a separate forecast.

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‘Blizzard Conditions Possible’; Winter Storm Could Dump Up to 30cm of Snow on Parts of Saskatchewan and Manitoba Early This Week

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Mother Nature isn’t holding back as a powerful winter storm sets its sights on Saskatchewan and Manitoba, starting late Monday. This storm will bring heavy snow, strong winds, and even blizzard conditions, marking the region’s first significant taste of winter. Some areas in Eastern Saskatchewan and Western Manitoba could see up to 30 cm of snow, with localized amounts possibly exceeding that by the end of Wednesday.

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Sustained winds of 40 km/h, with gusts reaching 70–80 km/h, are expected to create blowing snow, particularly overnight Tuesday into Wednesday morning. Blizzard conditions could develop in some areas. Prepare for hazardous travel, as highway closures are likely in the hardest-hit regions.

Before diving into the details, it’s important to note that this is a complex storm, with snowfall accumulating over multiple days. This preliminary forecast provides a general idea of the storm’s potential impacts, but adjustments are likely as the system approaches. Stay tuned for updates, including a more detailed snowfall accumulation map in the coming days.

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The storm will begin in Saskatchewan late Monday afternoon or evening, as precipitation moves into the province from the south. The first round of snowfall will primarily impact Central and Northeastern Saskatchewan, with areas like Prince Albert and Nipawin expected to see the heaviest snow through late Monday.

Overnight Monday into early Tuesday, precipitation in Saskatchewan will merge with an approaching system from the south, targeting Manitoba. The exact track of this system remains uncertain, but it’s expected to bring significant precipitation to Manitoba throughout Tuesday.

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Initially, much of Eastern Manitoba, including Winnipeg, will see heavy rain. By Tuesday late morning or early afternoon, colder air will begin to wrap into the region, creating a risk of freezing rain in parts of Southwestern Manitoba, including Brandon and Portage la Prairie.

Meanwhile, heavy snow will persist across Eastern Saskatchewan, where Arctic air is firmly in place. There is some uncertainty about how far west the precipitation will extend into Saskatchewan, but the heaviest snow is expected closer to the Manitoba border.

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By Tuesday late afternoon, most of Manitoba will transition from rain to snow as colder air overtakes above-freezing temperatures. Heavy snow will continue through the overnight hours into Wednesday morning.

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Strong winds, with sustained speeds near 40 km/h and gusts of up to 70 km/h, will develop late Tuesday and persist into much of Wednesday. Combined with heavy snowfall, this will likely lead to blowing snow and blizzard-like conditions, particularly in parts of Eastern Saskatchewan and Western Manitoba.

As the system exits the region later on Wednesday, the snowfall will gradually taper off. However, this storm will usher in the coldest air of the season so far, with temperatures dropping to -10°C to -20°C by the end of the week.

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Snowfall Accumulation

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Monday

By the end of Monday, snowfall totals are expected to reach 5–10 cm in parts of Central and Eastern Saskatchewan, including Prince Albert, Melfort, and Tisdale. Surrounding areas, such as Saskatoon and Wynyard, could see up to 5 cm of snow.

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Tuesday and Wednesday

From Tuesday through Wednesday, snowfall totals are expected to range between 15 and 30 cm across much of the affected region. The heaviest accumulations are anticipated near the Saskatchewan–Manitoba border, where localized totals could exceed 30 cm. Elevation will play a significant role, especially in Western Manitoba, where areas of higher terrain could see as much as 30–40 cm.

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In Central and Eastern Manitoba, snowfall amounts are harder to pinpoint, as the transition from rain to snow will dictate final totals. Portage la Prairie could see 15–25 cm, while Winnipeg may only receive 10–15 cm, depending on how long the rain lingers before changing to snow.

A similar uncertainty exists in Saskatchewan, but for a different reason—how far west the moisture will penetrate into the province. Some forecasts keep the heaviest precipitation closer to the Manitoba border, while others push it further west. Regina sits on the edge of the higher accumulation zone, with current estimates suggesting 5–15 cm for the city and surrounding areas.