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Eastern Lake Superior


Marine Forecast

Issued 10:30 AM EDT 20 October 2021

Today Tonight and Thursday.

Strong wind warning in effect.

Wind northeast 20 knots diminishing to northeast 15 this afternoon then increasing to northeast 20 Thursday morning. Wind backing to northwest 20 near noon Thursday then diminishing to northwest 15 Thursday evening.

Risk of waterspouts Thursday afternoon and evening.


Issued 10:30 AM EDT 20 October 2021
Today Tonight and Thursday. Waves 1.5 metres subsiding to 0.5 to 1 early this evening then building to 1.5 near noon Thursday.

Extended Forecast

Issued 03:35 AM EDT 20 October 2021
Friday Wind north 15 knots diminishing to light in the morning then becoming north 15 late in the day.
Saturday Wind north 15 knots diminishing to light.
Sunday Wind northwest 15 knots veering to northeast 15.

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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

Eastern Lake Superior

Issued 1:13 PM EDT 20 October 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 20 October 2021 Today Tonight and Thursday At 10:30 a.m. EDT today departing high 1027 mb located over
eastern Tennessee.

At 10:30 a.m. EDT today departing trough located on a line east-west
over North Channel.

By 10:30 a.m. EDT Thursday approaching low 1005 mb located over
central Lake Huron.

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