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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 12 May 2025

Today Tonight and Tuesday.

Wind variable 15 knots becoming southeast 15 early this morning then increasing to south 15 to 20 this evening. Wind diminishing to southeast 10 overnight then increasing to southeast 15 near noon Tuesday.

Waves

Issued 03:00 AM EDT 12 May 2025
Today Tonight and Tuesday. Waves 1 metre building to 1 to 1.5 near midnight then subsiding to 0.5 Tuesday morning. Waves building to 1 Tuesday afternoon.

Extended Forecast

Issued 03:00 AM EDT 12 May 2025
Wednesday Wind southeast 20 knots.
Thursday Wind southeast 15 knots increasing to southeast 20 late in the day.
Friday Wind southeast 20 knots veering to southwest 15 late in the day.

Ice Forecast*

Issued 12:00 PM EDT 11 May 2025 Today Tonight and Monday Open water except 1 tenth rotten thick lake ice in northern Black Bay and western Nipigon 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 11 May 2025 Today Tonight and Monday

Ice Coverage

Open water except 1 tenth rotten thick lake ice in northern Black Bay and western Nipigon Bay.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 12 May 2025 Today Tonight and Tuesday At 3:00 a.m. EDT today high 1029 mb located over eastern Ontario.
By 3:00 a.m. EDT Tuesday ridge located on a line north-south over
central Quebec.

At 3:00 a.m. EDT today trough located on a line east-west over
northwestern Ontario.
By 3:00 a.m. EDT Tuesday trough located on a line east-west over
northern Ontario.

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