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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the BuzzLayer Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
A blizzard warning for Southern Ontario means heavy snow, wind gusts over 70 km/h, and near-zero visibility. The live forecast above shows the current storm track; travel is not recommended until conditions improve.
What defines a blizzard in Southern Ontario?
Environment and Climate Change Canada issues a blizzard warning when snow or blowing snow combines with sustained winds or frequent gusts of at least 40 km/h, reducing visibility to under 400 metres for at least four hours. In Southern Ontario, lake-effect snow off Lake Huron and Georgian Bay often fuels these storms, especially across the Bruce Peninsula and into the London-to-Kitchener corridor.
How long will this blizzard last?
Most blizzard events in the region last 12 to 24 hours, with the worst conditions during the overnight and morning commute. The live forecast above provides hourly updates; after the squall line passes, flurries may linger but winds will ease. Check current weather warnings for your area before heading out.
Should I drive during a blizzard in Southern Ontario?
No. Whiteout conditions make driving extremely dangerous. If you must travel, keep an emergency kit, full gas tank, and a charged phone. Check 511 Ontario for road closures before leaving.
How is lake-effect snow different from a blizzard?
Lake-effect snow bands can produce intense snowfall rates, but a blizzard requires sustained high winds and widespread visibility below 400 metres. The two often combine near Lake Huron and Georgian Bay, creating a true blizzard event.
What should I do when a blizzard warning is issued?
Stay indoors, avoid travel, and monitor the live forecast above. Secure outdoor items, keep pets inside, and check on neighbours. If power fails, use flashlights not candles. For updates, visit Canada weather hub.