Marine Forecast
Issued 03:00 AM EDT 04 October 2026
Today Tonight and Monday.
Strong wind warning in effect.
Wind northwest 25 knots diminishing to northwest 15 Monday
morning and to west 10 Monday afternoon. Wind increasing to southwest 15 Monday
evening.
Periods of rain ending this morning.
Winds
Issued 03:00 AM EDT 04 October 2026
Today Tonight and Monday.
Strong wind warning in effect.
Wind northwest 25 knots diminishing to northwest 15 Monday
morning and to west 10 Monday afternoon. Wind increasing to southwest 15 Monday
evening.
Waves
Issued 03:00 AM EDT 04 October 2026
Today Tonight and Monday.
Waves 2 metres subsiding to 1 near noon Monday and to 0.5 or less
Monday evening.
Weather & Visibility
Issued 03:00 AM EDT 04 October 2026
Today Tonight and Monday.
Periods of rain ending this morning.
Ice Forecasts
Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings (In effect)
Western Lake Superior
Issued 03:00 AM EDT 04 October 2026'Strong' winds of 20 to 33 knots are 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.
Technical Marine Synopsis
Issued 3:00 AM EDT 4 October 2026 Today Tonight and Monday At 3:00 a.m. EDT today departing high 1030 mb located near Maine.
At 3:00 a.m. EDT today trough located on a line north-south over
western Lake Superior.
By 3:00 a.m. EDT Monday trough located on a line northeast-southwest
over eastern Lake Ontario.
At 3:00 a.m. EDT today low 1010 mb located over northwestern
Ontario.
By 3:00 a.m. EDT Monday low 998 mb located east of James Bay.