Western Lake Superior

Forecast

Marine Forecast

Issued 10:30 AM EDT 21 October 2017

Today Tonight and Sunday.

Strong wind warning in effect.

Wind south 20 knots backing to southeast 25 this afternoon then veering to south 25 late overnight. Wind veering to southwest 20 Sunday morning.

Chance of showers. Risk of thunderstorms late this afternoon and this evening changing to showers Sunday morning and ending Sunday evening.

Waves

Issued 10:30 AM EDT 21 October 2017
Today Tonight and Sunday. Waves one metre building to one and one half metres early this evening then subsiding to one near noon Sunday.

Extended Forecast

Issued 03:00 AM EDT 21 October 2017
Monday Wind southwest 20 knots backing to southeast 15 late in the day.
Tuesday Wind northeast 15 knots increasing to north 35.
Wednesday Wind north 30 knots diminishing to southwest 20.

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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

Warnings (In effect)

Strong wind warning in effect

Western Lake Superior

Issued 10:30 AM EDT 21 October 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.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 21 October 2017 Today Tonight and Sunday At 10:30 a.m. EDT today ridge located on a line north-south
over Quebec.
By 10:30 a.m. EDT Sunday ridge located on a line north-south over
Nova Scotia.

At 10:30 a.m. EDT today low 988 mb located over central Manitoba.
By 10:30 a.m. EDT Sunday low 982 mb located over western Hudson Bay.

At 10:30 a.m. EDT today cold front located on a line north-south
over western Wisconsin.
By 10:30 a.m. EDT Sunday cold front located on a line north-south
over Lake Superior.

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Summer 2017: Significant weather across Canada

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