Great Lakes - Western Lake Ontario Marine Forecast and Alerts

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Lake St. Clair

Marine Forecast

Issued 10:30 AM EST 20 December 2025

Today Tonight and Sunday.

Wind south 20 knots veering to southwest 15 this afternoon then to west 20 near midnight. Wind veering to northwest 20 early Sunday morning then diminishing to northwest 15 near noon Sunday. Wind diminishing to light Sunday evening.

Winds

Issued 10:30 AM EST 20 December 2025

Today Tonight and Sunday. Wind south 20 knots veering to southwest 15 this afternoon then to west 20 near midnight. Wind veering to northwest 20 early Sunday morning then diminishing to northwest 15 near noon Sunday. Wind diminishing to light Sunday evening.

Waves

Issued 10:30 AM EST 20 December 2025

Today Tonight and Sunday. Over open water waves 0.5 metres or less.

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.

No watches or warnings in effect.

Technical Marine Synopsis

Issued 10:30 AM EST 20 December 2025 Today Tonight and Sunday At 10:30 a.m. EST today ridge located on a line north-south over
eastern Ontario.
By 10:30 a.m. EST Sunday departing ridge located on a line
northeast-southwest over the East Coast of the U.S.

At 10:30 a.m. EST today low 994 mb located near Lake Nipigon.
By 10:30 a.m. EST Sunday low 997 mb located over southeastern
Quebec.

By 10:30 a.m. EST Sunday ridge located on a line north-south over
the Ontario - Manitoba border.

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