Marine Forecast
Issued 03:00 AM EST 20 December 2025
Today Tonight and Sunday.
Gale warning in effect.
Wind south 30 knots veering to southwest 25 early this morning
then increasing to west 35 this afternoon. Wind veering to northwest 35 early
this evening then diminishing to northwest 25 near midnight. Wind diminishing to
northwest 15 Sunday morning and to west 10 near noon Sunday. Wind increasing to
southwest 15 Sunday evening.
Snow changing to scattered flurries this afternoon.
Visibility 1 mile or less in snow.
Freezing spray warning in effect.
Freezing spray beginning this evening and ending Sunday
morning.
Strong wind warning program has ended for the season.
Winds
Issued 03:00 AM EST 20 December 2025
Today Tonight and Sunday.
Gale warning in effect.
Wind south 30 knots veering to southwest 25 early this morning
then increasing to west 35 this afternoon. Wind veering to northwest 35 early
this evening then diminishing to northwest 25 near midnight. Wind diminishing to
northwest 15 Sunday morning and to west 10 near noon Sunday. Wind increasing to
southwest 15 Sunday evening.
Strong wind warning program has ended for the season.
Waves
Issued 03:00 AM EST 20 December 2025
Today Tonight and Sunday.
Waves 2 to 3 metres subsiding to 2 overnight and to 0.5 to 1
Sunday morning.
Weather & Visibility
Issued 03:00 AM EST 20 December 2025
Today Tonight and Sunday.
Snow changing to scattered flurries this afternoon.
Visibility 1 mile or less in snow.
Freezing Spray
Issued 03:00 AM EST 20 December 2025
Today Tonight and Sunday.
Freezing spray warning in effect.
Freezing spray beginning this evening and ending Sunday
morning.
Ice Forecasts
Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings (In effect)
Western Lake Superior
Issued 03:00 AM EST 20 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 03:00 AM EST 20 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 3:00 AM EST 20 December 2025 Today Tonight and Sunday At 3:00 a.m. EST today ridge located on a line north-south over
northeastern Ontario.
By 3:00 a.m. EST Sunday departing ridge located on a line
northwest-southeast over the Gulf of St. Lawrence.
At 3:00 a.m. EST today low 996 mb located north of Lake of the
Woods.
By 3:00 a.m. EST Sunday low 999 mb located over western Quebec.
By 3:00 a.m. EST Sunday ridge located on a line north-south over
Minnesota.