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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Perspective Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Residents from southern Ontario through the St. Lawrence Valley should prepare for a significant snow storm arriving late Thursday, with Environment Canada issuing winter storm warnings for regions expecting 15 to 25 centimetres of accumulation and gusting winds reducing visibility.
Where is the snow storm hitting hardest?
The storm’s centre tracks east of Lake Huron, pulling moisture across the lower Great Lakes. Southern Ontario weather warnings today cover a swath from Windsor to Kingston, including the Greater Toronto Area’s northern suburbs. The heaviest bands, producing 2 to 4 centimetres per hour, are forecast for the Lake Erie shoreline and the Niagara region. As the system pushes into Quebec, Montreal and the Eastern Townships will see 10 to 15 centimetres by Friday morning.
How does this compare to other storms this season?
In the live ranking above, this storm currently sits as the third-largest snowfall event this winter for the Lake Ontario basin. It is not a record-breaker, but the combination of heavy, wet snow and strong easterly winds will make travel treacherous during the Thursday evening commute. The environment canada weather warnings for this system remain in effect until Friday midday.
What should you do before the storm hits?
Complete any errands or travel by early Thursday afternoon. If you drive, equip your vehicle with an emergency kit, a shovel, and warm blankets. The winter storm warning page has detailed safety checklists. For a broader look at active alerts, visit our Canada weather warnings hub.
Will this snow storm affect the 7 day weather forecast snow storm outlook?
Yes. This system will clear by Friday night, but a second, weaker disturbance may bring flurries Sunday night. The 14 day weather forecast snow storm models show no major storms for at least the next week after this event.
Is this a polar vortex event?
No. This is a classic Colorado low tracking northeast, not an arctic outbreak. Temperatures will hover near freezing, so the snow will be heavy and wet. For true polar cold, see our polar vortex cold weather forecast page.
Where can I find the latest weather forecast snow storm today updates?
Environment Canada issues updated bulletins every six hours or sooner if conditions change. For the full picture, check the Canada weather hub and the yellow weather warning guide.