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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 10 May 2025

Today Tonight and Sunday.

Strong wind warning in effect.

Wind north 10 knots becoming light near noon then increasing to south 15 late overnight. Wind increasing to south 20 Sunday morning then diminishing to southeast 15 Sunday afternoon. Wind diminishing to variable 10 Sunday evening.

Waves

Issued 10:30 AM EDT 10 May 2025
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 early Sunday morning and to 1 to 1.5 near noon Sunday. Waves subsiding to 0.5 to 1 Sunday evening.

Extended Forecast

Issued 03:00 AM EDT 10 May 2025
Monday Wind south 15 knots.
Tuesday Wind south 15 knots.
Wednesday Wind southeast 15 knots diminishing to light.

Ice Forecast*

Issued 12:00 PM EDT 9 May 2025 Today Tonight and Saturday Open water except 1 tenth thick lake ice in the extreme northeastern Thunder Bay section. 7 tenths thick lake ice in Nipigon Bay and eastern Black 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 9 May 2025 Today Tonight and Saturday

Ice Coverage

Open water except 1 tenth thick lake ice in the extreme northeastern Thunder Bay section. 7 tenths thick lake ice in Nipigon Bay and eastern Black Bay.

Warnings

Warnings (In effect)

Strong wind warning in effect

Western Lake Superior

Issued 10:30 AM EDT 10 May 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 10:30 AM EDT 10 May 2025 Today Tonight and Sunday At 10:30 a.m. EDT today low 1000 mb located south of Nova Scotia.
By 10:30 a.m. EDT Sunday departing low 992 mb located east of
Labrador.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over northwestern Ontario.
By 10:30 a.m. EDT Sunday ridge located on a line northeast-southwest
over Lake Huron.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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