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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 17 April 2026

Today Tonight and Saturday.

Wind southeast 20 knots increasing to southeast 30 this afternoon then diminishing to northwest 25 near midnight. Wind backing to west 25 near noon Saturday then veering to northwest 25 Saturday evening.

Scattered showers this morning. 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 10:30 AM EDT 17 April 2026
Today Tonight and Saturday. Over open water waves 0.5 to 1 metre building to 1.5 near noon and to 2 to 3 early this evening.

Extended Forecast

Issued 03:00 AM EDT 17 April 2026
Sunday Wind northwest 25 knots.
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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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

Warnings (In effect)

Squall warning in effect

Western Lake Superior

Issued 6:04 PM EDT 17 April 2026 Squalls with wind gusts up to 45 knots and frequent lightning are expected or occurring in the area.

A line of thunderstorms located over Minnesota is moving northeast at 45 knots and is expected to move into Canadian waters by 6:30 PM EDT.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. Consider delaying or postponing travel in areas under the squall warning.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

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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