Marine Forecast
Issued 10:30 AM EST 20 December 2025
Today Tonight and Sunday.
Gale warning in effect.
Wind south 20 knots veering to southwest 25 early this evening
then increasing to west 35 late overnight. Wind diminishing to northwest 25
Sunday afternoon and to northwest 15 Sunday evening.
Scattered showers tonight. Scattered flurries Sunday late
in the day.
Strong wind warning program has ended for the season.
Winds
Issued 10:30 AM EST 20 December 2025
Today Tonight and Sunday.
Gale warning in effect.
Wind south 20 knots veering to southwest 25 early this evening
then increasing to west 35 late overnight. Wind diminishing to northwest 25
Sunday afternoon and to northwest 15 Sunday evening.
Strong wind warning program has ended for the season.
Waves
Issued 10:30 AM EST 20 December 2025
Today Tonight and Sunday.
Waves 0.5 to 1 metre building to 1 to 1.5 this afternoon and to 2
to 3 late overnight. Waves subsiding to 1 to 1.5 Sunday evening.
Weather & Visibility
Issued 10:30 AM EST 20 December 2025
Today Tonight and Sunday.
Scattered showers tonight. Scattered flurries Sunday late
in the day.
Ice Forecasts
Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings (In effect)
Western Lake Ontario
Issued 10:30 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.
Technical Marine Synopsis
Issued 10:30 AM EST 20 December 2025 Today Tonight and Sunday At 10:30 a.m. EST today ridge located on a line north-south over
eastern Ontario.
By 10:30 a.m. EST Sunday departing ridge located on a line
northeast-southwest over the East Coast of the U.S.
At 10:30 a.m. EST today low 994 mb located near Lake Nipigon.
By 10:30 a.m. EST Sunday low 997 mb located over southeastern
Quebec.
By 10:30 a.m. EST Sunday ridge located on a line north-south over
the Ontario - Manitoba border.