Eastern Lake Superior, Canada Marine Forecast, Warnings and Alerts

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Eastern Lake Superior

Marine Forecast

Issued 03:00 AM EDT 25 August 2026

Today Tonight and Wednesday.

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

Scattered showers tonight and Wednesday with a risk of thunderstorms.

Winds

Issued 03:00 AM EDT 25 August 2026

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

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 early this evening then subsiding to 0.5 Wednesday afternoon. Waves building to 1 to 1.5 Wednesday evening.

Weather & Visibility

Issued 03:00 AM EDT 25 August 2026

Today Tonight and Wednesday. Scattered showers 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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