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Eastern Lake Superior

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 21 June 2025

Today Tonight and Sunday.

Strong wind warning in effect.

Wind southeast 20 knots diminishing to southwest 10 this afternoon then becoming variable 10 this evening. Wind becoming east 10 late overnight then increasing to east 15 Sunday morning. Wind veering to southeast 15 Sunday afternoon.

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

Waves

Issued 10:30 AM EDT 21 June 2025
Today Tonight and Sunday. Waves 1 to 1.5 metres subsiding to 0.5 or less early this evening then 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)

Strong wind warning in effect

Eastern Lake Superior

Issued 10:30 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 10:30 AM EDT 21 June 2025 Today Tonight and Sunday At 10:30 a.m. EDT today departing ridge located on a line
north-south over western Quebec.

At 10:30 a.m. EDT today low 992 mb located over South Dakota.
By 10:30 a.m. EDT Sunday low 1005 mb located over southern Quebec.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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