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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 ·
Environment and Climate Change Canada issues a winter storm warning when heavy snow, ice, or blowing snow poses a threat to life and property, typically within 24 hours. Across southern Ontario, these alerts often precede major systems moving off the Great Lakes. Check the live ranking above for today’s warnings in your region.
What does a winter storm warning mean for your area?
When a winter storm warning is in effect, expect significant snowfall accumulations (often 15 cm or more), freezing rain, or strong winds that reduce visibility. For Toronto and surrounding communities, such warnings are most common between December and March, driven by lake-effect bands or large low-pressure systems from the United States. The official alert from Environment Canada includes expected timing, snowfall rates, and affected highways.
How should you respond to an active warning?
If a winter storm warning covers your area, postpone non-essential travel. Keep a winter emergency kit in your vehicle, check the snow storm forecast for updates, and monitor local news. The warning typically lasts 12 to 24 hours, but lingering impacts like icy roads may persist. Refer to the Canada weather warnings page for a complete list of current alerts.
What is the difference between a winter storm watch and a warning?
A watch means conditions are possible in the next 24–48 hours, while a warning means the storm is imminent or occurring. When a warning is active, take immediate action. For a deeper explanation, see our article on yellow weather warnings.
Where can I find the latest winter storm warning for Ontario today?
The most up‑to‑date “ontario weather warnings today” and a “winter storm warning ontario today map” are available on the ECCC alerts page. You can also check the live ranking above or visit our Weather Warning hub.
How does lake‑effect snow affect southern Ontario warnings?
Lake‑effect snow bands can produce intense local accumulations, even when the broader system is not widespread. “Southern ontario weather warning today” often includes these narrow but dangerous bands near Lake Huron and Georgian Bay.