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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 11 May 2026

Today Tonight and Tuesday.

Strong wind warning in effect.

Wind north 10 knots becoming light this morning then becoming south 10 this afternoon. Wind increasing to southeast 15 near midnight and to southeast 20 Tuesday morning. Wind diminishing to east 15 Tuesday evening.

Periods of rain Tuesday.

Waves

Issued 03:00 AM EDT 11 May 2026
Today Tonight and Tuesday. Waves 0.5 metres or less building to 1 overnight and to 1.5 Tuesday morning. Waves subsiding to 1 Tuesday evening.

Extended Forecast

Issued 03:00 AM EDT 11 May 2026
Wednesday Wind northeast 15 knots backing to northwest 15 in the afternoon.
Thursday Wind light increasing to southeast 20 knots late in the day.
Friday Wind south 20 knots.

Ice Forecast*

Issued 12:00 PM EDT 10 May 2026 Today Tonight and Monday Open water except 1 tenth rotten very thick lake ice in Nipigon Bay and in northeastern Thunder Bay. 4 tenths rotten very thick lake ice in 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 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
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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 10 May 2026 Today Tonight and Monday

Ice Coverage

Open water except 1 tenth rotten very thick lake ice in Nipigon Bay
and in northeastern Thunder Bay. 4 tenths rotten very thick lake ice
in Black Bay.

Warnings

Warnings (In effect)

Strong wind warning in effect

Western Lake Superior

Issued 03:00 AM EDT 11 May 2026

'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 11 May 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today departing low 1001 mb located east of
James Bay.

At 3:00 a.m. EDT today high 1026 mb located over northwestern
Ontario.
By 3:00 a.m. EDT Tuesday high 1025 mb located near Lake Simcoe.

At 3:00 a.m. EDT today low 1002 mb located over Alberta.
By 3:00 a.m. EDT Tuesday low 1003 mb located over Minnesota.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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