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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 17 April 2025

Today Tonight and Friday.

Wind southeast 15 knots increasing to southeast 20 early this morning and to southeast 25 near noon. Wind diminishing to southeast 15 near midnight then backing to northeast 20 Friday morning.

Showers tonight with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 17 April 2025
Today Tonight and Friday. Waves 0.5 metres building to 1.5 this morning and to 2 this afternoon. Waves subsiding to 1 overnight.

Extended Forecast

Issued 03:00 AM EDT 17 April 2025
Saturday Wind northeast 20 knots backing to northwest 15 late in the day.
Sunday Wind light.
Monday Wind southeast 15 knots backing to east 20.

Ice Forecast*

Issued 12:00 PM EDT 16 April 2025 Today Tonight and Thursday Open water except 1 tenth thick lake ice along parts of the shores. Consolidated thick lake ice in Black Bay, Nipigon Bay and extreme northeastern section of Thunder 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 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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land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 16 April 2025 Today Tonight and Thursday

Ice Coverage

Open water except 1 tenth thick lake ice along parts of the shores.
Consolidated thick lake ice in Black Bay, Nipigon Bay and extreme
northeastern section of Thunder Bay.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 17 April 2025 Today Tonight and Friday At 3:00 a.m. EDT today ridge located on a line north-south over
Whitefish Bay.
By 3:00 a.m. EDT Friday ridge located on a line north-south over
the St. Lawrence River.

At 3:00 a.m. EDT today low 998 mb located over South Dakota.
By 3:00 a.m. EDT Friday trough from 994 mb low located on a line
northeast-southwest over western Lake Superior.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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