Marine Forecast
Issued 10:30 AM EST 21 December 2025
Today Tonight and Monday.
Gale warning in effect.
Wind west 35 knots diminishing to northwest 25 early this
evening and to northwest 15 near midnight. Wind backing to west 20 early Monday
morning then to southwest 15 Monday evening.
Scattered flurries ending this evening. Scattered flurries
Monday.
Strong wind warning program has ended for the season.
Winds
Issued 10:30 AM EST 21 December 2025
Today Tonight and Monday.
Gale warning in effect.
Wind west 35 knots diminishing to northwest 25 early this
evening and to northwest 15 near midnight. Wind backing to west 20 early Monday
morning then to southwest 15 Monday evening.
Strong wind warning program has ended for the season.
Waves
Issued 10:30 AM EST 21 December 2025
Today Tonight and Monday.
Waves 3 to 4 metres subsiding to 2 to 3 this evening and to 0.5
to 1 late overnight. Waves building to 1.5 Monday morning then subsiding to 0.5
to 1 Monday evening.
Weather & Visibility
Issued 10:30 AM EST 21 December 2025
Today Tonight and Monday.
Scattered flurries ending this evening. Scattered flurries
Monday.
Ice Forecasts
Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings (In effect)
Eastern Lake Ontario
Issued 10:30 AM EST 21 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.
Technical Marine Synopsis
Issued 10:30 AM EST 21 December 2025 Today Tonight and Monday At 10:30 a.m. EST today departing low 1000 mb located north of
the St. Lawrence River.
At 10:30 a.m. EST today ridge located on a line north-south over
Wisconsin.
By 10:30 a.m. EST Monday ridge located on a line north-south over
eastern Ontario.