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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 24 April 2026

Today Tonight and Saturday.

Wind southeast 30 knots diminishing to northeast 10 early this evening then backing to north 10 near midnight. Wind becoming light near noon Saturday.

Scattered showers with a risk of thunderstorms changing to rain this morning then to scattered showers this evening and ending near noon Saturday. Fog patches forming near midnight.

Waves

Issued 03:00 AM EDT 24 April 2026
Today Tonight and Saturday. Over open water waves 2 to 3 metres subsiding to 2 this afternoon and to 0.5 to 1 this evening. Waves subsiding to 0.5 or less overnight.

Extended Forecast

Issued 03:00 AM EDT 24 April 2026
Sunday Wind light.
Monday Wind southeast 15 knots increasing to southeast 25 late in the day.
Tuesday Wind southeast 30 knots diminishing to northwest 25.

Ice Forecast*

Issued 12:00 PM EDT 23 April 2026 Today Tonight and Friday Open water except 2 tenths very thick lake ice in Thunder Bay and along parts of the northwestern shore. 7 tenths rotten thick lake ice in Chequamegon Bay and east of Duluth. Consolidated very thick lake ice in Black Bay and Nipigon Bay and in northeastern 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 Kenora Airport Pukaskwa National Park Royal Island Armstrong Airport Caribou Island Marathon Airport Thunder Bay Airport Welcome Island Little Flatland Island Sault Ste. Marie Airport Wawa Airport Slate Island - 45136 Lake Of the Woods - 45148
Legend:
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land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 23 April 2026 Today Tonight and Friday

Ice Coverage

Open water except 2 tenths very thick lake ice in Thunder Bay and
along parts of the northwestern shore. 7 tenths rotten thick lake
ice in Chequamegon Bay and east of Duluth. Consolidated very thick
lake ice in Black Bay and Nipigon Bay and in northeastern Thunder
Bay.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 24 April 2026 Today Tonight and Saturday At 3:00 a.m. EDT today ridge located on a line north-south over
the Ontario - Quebec border.
By 3:00 a.m. EDT Saturday ridge located on a line north-south
over Montréal.

At 3:00 a.m. EDT today cold front located from Thunder Bay to
Missouri.
By 3:00 a.m. EDT Saturday cold front located on a line north-south
over Lake Erie.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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