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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 21 June 2025

Today Tonight and Sunday.

Strong wind warning in effect.

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

Showers ending this afternoon with a risk of thunderstorms. Scattered showers overnight and Sunday morning with a risk of thunderstorms. Fog patches.

Waves

Issued 03:00 AM EDT 21 June 2025
Today Tonight and Sunday. Waves 0.5 to 1 metre building to 1 to 1.5 this morning then subsiding to 0.5 or less this afternoon. Waves building to 0.5 to 1 near noon Sunday.

Extended Forecast

Issued 03:00 AM EDT 21 June 2025
Monday Wind southwest 15 knots.
Tuesday Wind northwest 15 knots diminishing to light.
Wednesday Wind light.

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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 16 May 2025 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Squall warning in effect

Western Lake Superior

Issued 04:05 AM EDT 21 June 2025 Squalls with wind gusts up to 40 knots, frequent lightning and hail of 1 to 2 centimetres are expected or occurring in the area.

As of 3:50 a.m. EDT, this line of thunderstorms is located from 15 nautical miles southwest of Suomi to 27 nautical miles south of Pigeon River, moving northeast at 40 knots.

Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Strong wind warning in effect

Western Lake Superior

Issued 03:00 AM EDT 21 June 2025

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 21 June 2025 Today Tonight and Sunday At 3:00 a.m. EDT today departing ridge located on a line north-south
over western Quebec.

At 3:00 a.m. EDT today low 992 mb located over South Dakota.
By 3:00 a.m. EDT Sunday low 1001 mb located over southern Quebec.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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