Marine Forecast
Issued 10:30 AM EST 18 December 2025
Today Tonight and Friday.
Gale warning in effect.
Wind south 20 knots increasing to north 30 this afternoon and to
north 40 early this evening. Wind diminishing to north 25 Friday morning and to
north 15 Friday afternoon. Wind becoming southeast 15 Friday
evening.
Rain changing to snow this afternoon then to scattered
flurries near noon Friday. Visibility 1 mile or less in
precipitation.
Freezing spray warning in effect.
Freezing spray beginning this evening and ending Friday
afternoon.
Strong wind warning program has ended for the season.
Winds
Issued 10:30 AM EST 18 December 2025
Today Tonight and Friday.
Gale warning in effect.
Wind south 20 knots increasing to north 30 this afternoon and to
north 40 early this evening. Wind diminishing to north 25 Friday morning and to
north 15 Friday afternoon. Wind becoming southeast 15 Friday
evening.
Strong wind warning program has ended for the season.
Waves
Issued 10:30 AM EST 18 December 2025
Today Tonight and Friday.
Waves 2 metres building to 3 to 4 this evening then subsiding to
2 near noon Friday. Waves subsiding to 0.5 to 1 Friday evening.
Weather & Visibility
Issued 10:30 AM EST 18 December 2025
Today Tonight and Friday.
Rain changing to snow this afternoon then to scattered
flurries near noon Friday. Visibility 1 mile or less in
precipitation.
Freezing Spray
Issued 10:30 AM EST 18 December 2025
Today Tonight and Friday.
Freezing spray warning in effect.
Freezing spray beginning this evening and ending Friday
afternoon.
Ice Forecasts
Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings (In effect)
Western Lake Superior
Issued 10:30 AM EST 18 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 10:30 AM EST 18 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 10:30 AM EST 18 December 2025 Today Tonight and Friday At 10:30 a.m. EST today low 984 mb located over northeastern
Minnesota.
By 10:30 a.m. EST Friday deepening low 981 mb located southeast
of James Bay.
At 10:30 a.m. EST today ridge located on a line north-south over
eastern Montana.
By 10:30 a.m. EST Friday ridge located on a line north-south over
northwestern Ontario.