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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 17 April 2026

Tonight and Saturday.

Wind southeast 30 knots diminishing to northwest 25 near midnight then backing to west 25 near noon Saturday. Wind veering to northwest 25 Saturday evening.

Showers and fog patches tonight with a risk of thunderstorms becoming scattered flurries or scattered showers and ending Saturday morning. Scattered flurries Saturday evening.

Waves

Issued 06:30 PM EDT 17 April 2026
Tonight and Saturday. Over open water waves 2 to 3 metres.

Extended Forecast

Issued 06:30 PM EDT 17 April 2026
Sunday Wind northwest 25 knots diminishing to northwest 15 late in the day.
Monday Wind northwest 15 knots increasing to south 25 late in the day.
Tuesday Wind south 25 knots diminishing to northwest 15 late in the day.

Ice Forecast*

Issued 12:00 PM EDT 17 April 2026 Today Tonight and Saturday Open water except 5 tenths thick lake ice including 2 tenths very thick lake ice in Thunder Bay and along parts of the northwestern shore. 9 tenths rotten thick lake ice in Chequamegon Bay and near Duluth. Consolidated very thick lake ice in Black Bay and Nipigon Bay and in northeastern 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 Kenora Airport Pukaskwa National Park Royal Island Armstrong Airport Caribou Island Marathon Airport Thunder Bay Airport Welcome Island Little Flatland Island Sault Ste. Marie Airport Wawa Airport Slate Island - 45136 Lake Of the Woods - 45148
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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 17 April 2026 Today Tonight and Saturday

Ice Coverage

Open water except 5 tenths thick lake ice including 2 tenths very
thick lake ice in Thunder Bay and along parts of the northwestern
shore. 9 tenths rotten thick lake ice in Chequamegon Bay and near
Duluth. Consolidated very thick lake ice in Black Bay and Nipigon
Bay and in northeastern Thunder Bay.

Warnings

Watches (Ended)

Squall watch ended

Western Lake Superior

Issued 11:39 PM EDT 17 April 2026
Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 17 April 2026 Tonight and Saturday At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over the St. Lawrence River.
By 6:30 p.m. EDT Saturday ridge located on a line
northeast-southwest over Nova Scotia.

At 6:30 p.m. EDT tonight low 994 mb located over western Lake
Superior.
By 6:30 p.m. EDT Saturday low 982 mb located over southern
Hudson Bay.

At 6:30 p.m. EDT tonight cold front located on a line north-south
over Wisconsin.
By 6:30 p.m. EDT Saturday cold front from low located on a line
north-south over eastern Ontario.

Great Lakes - Lake Superior Area

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