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Eastern Lake Superior

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 05 December 2025

Today Tonight and Saturday.

Wind southwest 25 knots diminishing to southwest 15 this afternoon then increasing to southwest 20 this evening. Wind veering to northwest 25 near midnight then diminishing to northwest 15 Saturday afternoon.

Flurries. Visibility 1 mile or less in flurries.

Waves

Issued 10:30 AM EST 05 December 2025
Today Tonight and Saturday. Waves 2 metres subsiding to 1.5 this afternoon then building to 2 late overnight. Waves subsiding to 1.5 near noon Saturday and to 1 Saturday evening.

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
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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 (Ended)

Freezing spray warning ended

Eastern Lake Superior

Issued 10:30 AM EST 05 December 2025
Synopsis

Technical Marine Synopsis

Issued 10:30 AM EST 5 December 2025 Today Tonight and Saturday At 10:30 a.m. EST today ridge located on a line north-south over
central Quebec.
By 10:30 a.m. EST Saturday departing ridge located on a line
north-south over New Brunswick.

At 10:30 a.m. EST today cold front located on a line
northeast-southwest over northwestern Ontario.
By 10:30 a.m. EST Saturday cold front located on a line
northeast-southwest over northeastern Ontario.

Great Lakes - Lake Superior Area

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