Western Lake Superior


Marine Forecast

Issued 03:00 AM EDT 20 September 2017

Today Tonight and Thursday.

Strong wind warning in effect.

Wind southeast 20 knots increasing to southeast 25 this morning then diminishing to southwest 15 early this evening. Wind diminishing to light near midnight then becoming southeast 10 Thursday evening.

A few showers beginning this morning and ending this evening with a risk of thunderstorms. Fog patches forming near noon and dissipating near midnight.


Issued 03:00 AM EDT 20 September 2017
Today Tonight and Thursday. Waves one metre building to 2 near noon then subsiding to one this evening. Waves subsiding to one half metre or less overnight.

Extended Forecast

Issued 03:00 AM EDT 20 September 2017
Friday Wind light becoming southeast 15 knots in the afternoon.
Saturday Wind southeast 15 knots.
Sunday Wind light becoming south 15 knots late in the day.

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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 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 Kenora Airport
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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 27 April 2017 Forecasts have ended for the season.

Warnings (In effect)

Strong wind warning in effect

Western Lake Superior

Issued 03:00 AM EDT 20 September 2017

'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 3:00 AM EDT 20 September 2017 Today Tonight and Thursday At 3:00 a.m. EDT today quasi-stationary ridge located on a line
northeast-southwest over eastern Ontario.

At 3:00 a.m. EDT today trough located from Saskatchewan to
By 3:00 a.m. EDT Thursday trough located over James Bay to
Whitefish Bay.

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