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Western Lake Superior


Marine Forecast

Issued 10:30 AM EDT 04 August 2021

Today Tonight and Thursday.

Strong wind warning in effect.

Wind south 10 knots increasing to southwest 15 near noon and to southwest 20 this afternoon. Wind diminishing to southwest 15 late overnight then backing to south 15 Thursday afternoon.

Scattered showers Thursday evening with a risk of thunderstorms.


Issued 10:30 AM EDT 04 August 2021
Today Tonight and Thursday. Waves one half metre or less building to one half to one metre near noon.

Extended Forecast

Issued 03:00 AM EDT 04 August 2021
Friday Wind south 15 knots diminishing to light in the morning.
Saturday Wind light.
Sunday Wind southeast 15 knots increasing to southeast 20.

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Weather Conditions

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Map of Great Lakes - Lake Superior marine weather areas Mid Superior - 45001 East Superior - 45004 West Superior - 45006 Slate Island - 45136 Lake Of the Woods - 45148 Kenora Airport Royal Island Armstrong Airport Caribou Island Marathon Airport Pukaskwa National Park Thunder Bay Airport Welcome Island Little Flatland Island Sault Ste. Marie Airport Wawa Airport
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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 2021 Forecasts have ended for the season.

Warnings (In effect)

Strong wind warning in effect

Western Lake Superior

Issued 10:30 AM EDT 04 August 2021

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.


Technical Marine Synopsis

Issued 10:30 AM EDT 4 August 2021 Today Tonight and Thursday At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over Georgian Bay.
By 10:30 a.m. EDT Thursday ridge located on a line north-south
over Lake Ontario.

At 10:30 a.m. EDT today trough located on a line northeast-southwest
over the Ontario - Manitoba border.
By 3:00 a.m. EDT Thursday trough located from James Bay to Lake
of the Woods.

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