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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 30 April 2025

Today Tonight and Thursday.

Wind variable 10 knots increasing to southeast 15 early this morning and to southeast 20 this afternoon. Wind diminishing to southeast 15 this evening and to east 10 Thursday afternoon. Wind becoming light Thursday evening.

Waves

Issued 03:00 AM EDT 30 April 2025
Today Tonight and Thursday. Waves 0.5 metres or less building to 0.5 to 1 this morning and to 1 to 1.5 this afternoon. Waves subsiding to 1 overnight and to 0.5 or less Thursday afternoon.

Extended Forecast

Issued 03:00 AM EDT 30 April 2025
Friday Wind light becoming north 15 knots in the morning.
Saturday Wind north 15 knots becoming southwest 15.
Sunday Wind light.

Ice Forecast*

Issued 12:00 PM EDT 29 April 2025 Today Tonight and Wednesday Open water. CONSOLIDATED rotten thick lake ice in Black Bay, Nipigon Bay and the extreme northeastern section of Thunder Bay.

*Ice Forecast and Warnings also apply to U.S. waters

 

[ Canadian Ice Service ]

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Map of Great Lakes - Lake Superior marine weather areas Pukaskwa National Park Marathon Airport Caribou Island Armstrong Airport Royal Island Kenora Airport Thunder Bay Airport Welcome Island Lake Of the Woods - 45148 Little Flatland Island Sault Ste. Marie Airport Wawa Airport Slate Island - 45136
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Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 29 April 2025 Today Tonight and Wednesday

Ice Coverage

Open water. CONSOLIDATED rotten thick lake ice in Black Bay, Nipigon
Bay and the extreme northeastern section of Thunder Bay.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 30 April 2025 Today Tonight and Thursday At 3:00 a.m. EDT today departing trough located on a line
northeast-southwest over eastern Ontario.

At 3:00 a.m. EDT today high 1025 mb located over Lake Superior.
By 3:00 a.m. EDT Thursday high 1024 mb located over western Quebec.

By 3:00 a.m. EDT Thursday approaching low 1005 mb located over
Missouri.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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