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Government of Canada / Gouvernement du Canada

Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 19 March 2026

Today Tonight and Friday.

Wind north 10 knots becoming light near noon then increasing to southeast 15 this evening. Wind increasing to southeast 20 near midnight then becoming north 20 Friday morning. Wind diminishing to northwest 10 near noon Friday then backing to southwest 10 Friday evening.

Snow tonight with a risk of freezing rain changing to scattered showers or scattered flurries and ending Friday morning. Visibility 1 mile or less in snow.

Waves

Issued 03:00 AM EDT 19 March 2026
Today Tonight and Friday. Over open water waves 0.5 metres or less building to 1.5 near midnight then subsiding to 1 Friday morning. Waves subsiding to 0.5 or less Friday afternoon.

Extended Forecast

Issued 03:00 AM EDT 19 March 2026
Saturday Wind light increasing to east 15 knots in the afternoon and to northeast 25 late in the day.
Sunday Wind northeast 25 knots diminishing to north 15 late in the day.
Monday Wind light becoming south 15 knots late in the day.

Ice Forecast*

Issued 12:00 PM EDT 18 March 2026 Today Tonight and Thursday 3 tenths new lake ice including 1 tenth thick lake ice except 9 tenths thick lake ice along parts of the southern shore. Consolidated thick lake ice in Thunder Bay and along parts of the southern shore. Consolidated very thick lake ice in Black Bay and Nipigon Bay.

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

 

[ Canadian Ice Service ]

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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 18 March 2026 Today Tonight and Thursday

Ice Coverage

3 tenths new lake ice including 1 tenth thick lake ice except 9
tenths thick lake ice along parts of the southern shore.
Consolidated thick lake ice in Thunder Bay and along parts of the
southern shore. Consolidated very thick lake ice in Black Bay and
Nipigon Bay.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 19 March 2026 Today Tonight and Friday At 3:00 a.m. EDT today low 1010 mb located over northeastern
Ontario.
By 3:00 a.m. EDT Friday departing low 1013 mb located over Quebec.

At 3:00 a.m. EDT today ridge located on a line north-south over
eastern Manitoba.
By 3:00 a.m. EDT Friday ridge located on a line north-south over
eastern Ontario.

By 3:00 a.m. EDT Friday low 1005 mb located over northwestern
Ontario.

Great Lakes - Lake Superior Area

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