Marine Forecast
Issued 07:01 PM EST 04 December 2025
Tonight and Friday.
Gale warning in effect.
Wind southwest 35 knots diminishing to southwest 30 near
midnight and to northwest 20 late overnight. Wind diminishing to west 10 Friday
morning then increasing to west 20 Friday afternoon. Wind veering to northwest
20 Friday evening.
Scattered flurries changing to snow this evening then to
scattered flurries Friday morning. Visibility 1 mile or less in
precipitation.
Freezing spray warning in effect.
Freezing spray ending Friday morning.
Strong wind warning program has ended for the season.
Winds
Issued 07:01 PM EST 04 December 2025
Tonight and Friday.
Gale warning in effect.
Wind southwest 35 knots diminishing to southwest 30 near
midnight and to northwest 20 late overnight. Wind diminishing to west 10 Friday
morning then increasing to west 20 Friday afternoon. Wind veering to northwest
20 Friday evening.
Strong wind warning program has ended for the season.
Waves
Issued 02:05 AM EST 05 December 2025
Friday.
Waves 3 metres subsiding to 2 early Friday morning and to 1 near
noon Friday. Waves building to 1.5 early Friday evening.
Weather & Visibility
Issued 07:01 PM EST 04 December 2025
Tonight and Friday.
Scattered flurries changing to snow this evening then to
scattered flurries Friday morning. Visibility 1 mile or less in
precipitation.
Freezing Spray
Issued 07:01 PM EST 04 December 2025
Tonight and Friday.
Freezing spray warning in effect.
Freezing spray ending Friday morning.
Ice Forecasts
Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings (In effect)
Western Lake Superior
Issued 7:01 PM EST 04 December 2025'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.
Western Lake Superior
Issued 7:01 PM EST 04 December 2025Moderate or severe freezing spray is 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 6:30 PM EST 4 December 2025 Tonight and Friday At 6:30 p.m. EST tonight ridge located on a line northeast-southwest
over southwestern Ontario.
By 6:30 p.m. EST Friday departing ridge located on a line
northeast-southwest over the Maritimes.
At 6:30 p.m. EST tonight cold front located on a line east-west
over southern Manitoba.
By 6:30 p.m. EST Friday cold front located on a line
northeast-southwest over Lake Superior.