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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 11 March 2026

Tonight and Thursday.

Gale warning in effect.

Wind southwest 25 knots increasing to west 35 near midnight then diminishing to west 25 early Thursday morning. Wind veering to northwest 20 Thursday evening.

Scattered showers changing to scattered flurries overnight.

Waves

Issued 06:30 PM EDT 11 March 2026
Tonight and Thursday. Waves 0.5 to 1 metre building to 1.5 this evening and to 2 near midnight. Waves subsiding to 1 to 1.5 near noon Thursday and to 0.5 to 1 Thursday evening.

Extended Forecast

Issued 06:30 PM EDT 11 March 2026
Friday Wind northwest 15 knots diminishing to light in the morning then increasing to southeast 20 in the afternoon.
Saturday Wind southwest 35 knots diminishing to light late in the day.
Sunday Wind light increasing to east 30 knots.

Ice Forecast*

Issued 12:00 PM EDT 11 March 2026 Today Tonight and Thursday 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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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 11 March 2026 Today Tonight and Thursday

Ice Coverage

Open water.

Warnings

Warnings (In effect)

Gale warning in effect

Western Lake Ontario

Issued 6:30 PM EDT 11 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 11 March 2026 Tonight and Thursday At 6:30 p.m. EDT tonight low 995 mb located over eastern Ontario.
By 6:30 p.m. EDT Thursday departing low 991 mb located over the
Gulf of St. Lawrence.

By 6:30 p.m. EDT Thursday ridge located on a line north-south over
northeastern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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