Marine Forecast
Issued 06:30 PM EST 04 December 2025
Tonight and Friday.
Wind northwest 20 knots backing to southwest 15 this evening
then increasing to southwest 25 near midnight. Wind southwest 25
Friday.
Scattered flurries this evening and Friday. Visibility 1
mile or less in flurries.
Freezing spray warning in effect.
Freezing spray late overnight and Friday morning.
Strong wind warning program has ended for the season.
Winds
Issued 06:30 PM EST 04 December 2025
Tonight and Friday.
Wind northwest 20 knots backing to southwest 15 this evening
then increasing to southwest 25 near midnight. Wind southwest 25
Friday.
Strong wind warning program has ended for the season.
Waves
Issued 06:30 PM EST 04 December 2025
Tonight and Friday.
Waves 1 metre building to 2 late overnight.
Weather & Visibility
Issued 06:30 PM EST 04 December 2025
Tonight and Friday.
Scattered flurries this evening and Friday. Visibility 1
mile or less in flurries.
Freezing Spray
Issued 06:30 PM EST 04 December 2025
Tonight and Friday.
Freezing spray warning in effect.
Freezing spray late overnight and Friday morning.
Ice Forecasts
Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings (In effect)
Southern Georgian Bay
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.