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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 13 December 2025

Today Tonight and Sunday.

Wind northwest 25 knots veering to north 20 near midnight then backing to northwest 15 Sunday morning. Wind backing to southwest 15 Sunday afternoon then increasing to southwest 25 Sunday evening.

Flurries.

Freezing spray warning in effect.

Freezing spray ending overnight.

Waves

Issued 10:30 AM EST 13 December 2025
Today Tonight and Sunday. Waves 2 metres subsiding to 1 late overnight.

Extended Forecast

Issued 03:00 AM EST 13 December 2025
Monday Wind southwest 25 knots increasing to southwest 30 in the morning then diminishing to northwest 20 in the afternoon.
Tuesday Wind light increasing to southwest 30 knots late in the day.
Wednesday Wind northwest 35 knots diminishing to south 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 (In effect)

Freezing spray warning in effect

Western Lake Superior

Issued 10:30 AM EST 13 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 10:30 AM EST 13 December 2025 Today Tonight and Sunday At 10:30 a.m. EST today departing ridge located on a line
north-south over eastern Quebec.

At 10:30 a.m. EST today low 1005 mb located over northeastern
Ontario.
By 10:30 a.m. EST Sunday low 1016 mb located over eastern Quebec.

At 10:30 a.m. EST today ridge located on a line north-south over
southern Saskatchewan.
By 10:30 a.m. EST Sunday approaching ridge located on a line
north-south over Minnesota.

Great Lakes - Lake Superior Area

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