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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 05 December 2025

Today Tonight and Saturday.

Wind west 20 knots diminishing to west 10 this morning then increasing to west 15 this afternoon. Wind veering to northwest 20 this evening then increasing to northwest 25 overnight. Wind diminishing to northwest 15 Saturday afternoon and to northwest 10 Saturday evening.

Snow changing to flurries early this morning. Visibility 1 mile or less in precipitation.

Freezing spray warning in effect.

Freezing spray ending this morning.

Waves

Issued 03:00 AM EST 05 December 2025
Today Tonight and Saturday. Waves 3 metres subsiding to 2 early this morning and to 1 near noon. Waves building to 1.5 early this evening then subsiding to 1 Saturday afternoon.

Extended Forecast

Issued 03:00 AM EST 05 December 2025
Sunday Wind northwest 15 knots increasing to northwest 25 in the morning then diminishing to northwest 15 late in the day.
Monday Wind west 15 knots increasing to southwest 25.
Tuesday Wind southwest 25 knots veering to northwest 25.

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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
Legend:
buoy Buoy
land station Land Station
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)

Freezing spray warning in effect

Western Lake Superior

Issued 03:00 AM EST 05 December 2025

Moderate or severe freezing spray is 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 EST 5 December 2025 Today Tonight and Saturday At 3:00 a.m. EST today ridge located on a line north-south over
Ottawa.
By 3:00 a.m. EST Saturday departing ridge located on a line
north-south over New Brunswick.

At 3:00 a.m. EST today cold front located on a line
northeast-southwest over southern Manitoba.
By 3:00 a.m. EST Saturday cold front located on a line
northeast-southwest over Sault Ste. Marie.

Great Lakes - Lake Superior Area

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