Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.

Watches (In effect)

Waterspout watch in effect

Western Lake Ontario

Issued 00:46 AM EDT 25 August 2026 Conditions are favourable for the development of waterspouts through tonight. Conditions will remain favourable for waterspout development into Tuesday morning over Lake Ontario.

Waterspouts are generally short-lived in nature, typically lasting 20 minutes or less.

Waterspouts sometimes appear as funnel clouds with swirling water visible near the surface.

Waterspouts are generated by weak rotation under rapidly growing clouds or weak thunderstorms. Under favourable conditions, this weak rotation could intensify and become a tornado.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

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Technical Marine Synopsis

Issued 3:00 AM EDT 25 August 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today trough located on a line northeast-southwest
over eastern Ontario.
By 3:00 a.m. EDT Wednesday departing trough located on a line
north-south over the Eastern Seaboard.

At 3:00 a.m. EDT today ridge located on a line north-south over
Lake Superior.
By 3:00 a.m. EDT Wednesday ridge located on a line north-south
over Lake of the Woods.

At 3:00 a.m. EDT today trough located on a line north-south over
the Ontario - Manitoba border.
By 3:00 a.m. EDT Wednesday trough located on a line north-south
over western Lake Superior.