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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 12 March 2026

Tonight and Friday.

Gale warning in effect.

Wind northwest 20 knots diminishing to light near midnight then increasing to southeast 15 Friday morning. Wind increasing to southeast 25 Friday afternoon and to southwest 35 Friday evening.

Scattered flurries this evening. Snow Friday morning and afternoon changing to showers or flurries. Visibility 1 mile or less in snow.

Waves

Issued 06:30 PM EDT 12 March 2026
Tonight and Friday. Waves 1 metre subsiding to 0.5 or less late overnight then building to 1 near noon Friday. Waves building to 2 Friday evening.

Extended Forecast

Issued 06:30 PM EDT 12 March 2026
Saturday Wind west 40 knots diminishing to west 15 late in the day.
Sunday Wind light increasing to south 30 knots late in the day.
Monday Wind south 30 knots increasing to southwest 35 late in the day.

Ice Forecast*

Issued 12:00 PM EDT 12 March 2026 Today Tonight and Friday Open water.

*Ice Forecast and Warnings also apply to U.S. waters

 

[ Canadian Ice Service ]

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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buoy Buoy
land station Land Station
Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 12 March 2026 Today Tonight and Friday

Ice Coverage

Open water.

Warnings

Warnings (In effect)

Gale warning in effect

Western Lake Ontario

Issued 6:30 PM EDT 12 March 2026

'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.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 12 March 2026 Tonight and Friday At 6:30 p.m. EDT tonight ridge located on a line north-south over
Whitefish Bay.
By 6:30 p.m. EDT Friday departing ridge located on a line
north-south over Maine.

At 6:30 p.m. EDT tonight low 990 mb located over North Dakota.
By 6:30 p.m. EDT Friday low 993 mb located over Lake Huron.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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