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Western Lake Superior

Forecast

Marine Forecast

Issued 10:30 AM EDT 09 May 2025

Today Tonight and Saturday.

Wind south 10 knots veering to southwest 10 near noon then becoming variable 10 early this evening. Wind increasing to north 15 near midnight then diminishing to light near noon Saturday.

Scattered showers this afternoon and this evening.

Waves

Issued 10:30 AM EDT 09 May 2025
Today Tonight and Saturday. Waves 0.5 metres or less building to 0.5 to 1 late overnight then subsiding to 0.5 or less Saturday afternoon.

Extended Forecast

Issued 03:00 AM EDT 09 May 2025
Sunday Wind light increasing to south 20 knots in the morning.
Monday Wind south 15 knots.
Tuesday Wind south 15 knots.

Ice Forecast*

Issued 12:00 PM EDT 9 May 2025 Today Tonight and Saturday Open water except 1 tenth thick lake ice in the extreme northeastern Thunder Bay section. 7 tenths thick lake ice in Nipigon Bay and eastern Black 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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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 9 May 2025 Today Tonight and Saturday

Ice Coverage

Open water except 1 tenth thick lake ice in the extreme northeastern Thunder Bay section. 7 tenths thick lake ice in Nipigon Bay and eastern Black Bay.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 9 May 2025 Today Tonight and Saturday At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over northeastern Ontario.
By 10:30 a.m. EDT Saturday ridge located on a line
northeast-southwest over southern Ontario.

At 10:30 a.m. EDT today cold front located on a line
northeast-southwest over northwestern Ontario.
By 10:30 a.m. EDT Saturday cold front located on a line
northeast-southwest over northeastern Ontario.

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