Great Lakes - Eastern Lake Ontario Marine Forecast and Alerts

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Eastern Lake Ontario

Marine Forecast

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday.

Strong wind warning in effect.

Wind south 15 knots increasing to southwest 20 this afternoon and to southwest 20 to 25 early this evening. Wind veering to west 15 to 20 early Thursday morning then becoming northwest 15 Thursday evening.

Showers ending near midnight with a risk of thunderstorms.

Winds

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday. Strong wind warning in effect. Wind south 15 knots increasing to southwest 20 this afternoon and to southwest 20 to 25 early this evening. Wind veering to west 15 to 20 early Thursday morning then becoming northwest 15 Thursday evening.

Waves

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday. Waves 0.5 to 1 metre building to 1 to 1.5 early this evening then subsiding to 0.5 to 1 Thursday evening.

Weather & Visibility

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday. Showers ending near midnight with a risk of thunderstorms.

Ice Forecasts

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

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 10:30 AM EDT 09 September 2026

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio.

Technical Marine Synopsis

Issued 10:30 AM EDT 9 September 2026 Today Tonight and Thursday At 10:30 a.m. EDT today departing ridge located on a line
northeast-southwest over the Gulf of St. Lawrence.

At 10:30 a.m. EDT today low 986 mb located over southern Hudson Bay.
By 10:30 a.m. EDT Thursday low 982 mb located east of Hudson Bay.

At 10:30 a.m. EDT today cold front from low located on a line
northeast-southwest over eastern Lake Superior.
By 10:30 a.m. EDT Thursday cold front from low located on a line
northeast-southwest over New England.

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