Western Lake Superior, Canada Marine Forecast, Warnings and Alerts

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Western Lake Superior

Marine Forecast

Issued 03:00 AM EDT 25 August 2026

Today Tonight and Wednesday.

Wind west 10 knots backing to south 10 early this morning then increasing to southeast 15 early this evening. Wind veering to south 15 near midnight then diminishing to west 10 Wednesday morning. Wind increasing to northwest 15 to 20 Wednesday afternoon.

Scattered showers this afternoon tonight and Wednesday with a risk of thunderstorms.

Winds

Issued 03:00 AM EDT 25 August 2026

Today Tonight and Wednesday. Wind west 10 knots backing to south 10 early this morning then increasing to southeast 15 early this evening. Wind veering to south 15 near midnight then diminishing to west 10 Wednesday morning. Wind increasing to northwest 15 to 20 Wednesday afternoon.

Waves

Issued 03:00 AM EDT 25 August 2026

Today Tonight and Wednesday. Waves 0.5 metres or less building to 0.5 to 1 this evening then subsiding to 0.5 or less Wednesday morning. Waves building to 1 Wednesday evening.

Weather & Visibility

Issued 03:00 AM EDT 25 August 2026

Today Tonight and Wednesday. Scattered showers this afternoon tonight and Wednesday with a risk of thunderstorms.

Ice Forecasts

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

No watches or warnings in effect.

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.

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