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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 11 March 2026

Today Tonight and Thursday.

Gale warning in effect.

Wind northeast 20 knots diminishing to northeast 15 near noon then increasing to southwest 30 this evening. Wind increasing to west 35 near midnight then diminishing to west 30 Thursday morning. Wind veering to northwest 25 Thursday afternoon then increasing to northwest 30 Thursday evening.

Showers with a risk of thunderstorms changing to scattered flurries Thursday morning.

Waves

Issued 03:00 AM EDT 11 March 2026
Today Tonight and Thursday. Over open water waves 1 to 1.5 metres subsiding to 0.5 to 1 this afternoon then building to 2 near midnight. Waves subsiding to 1.5 Thursday evening.

Extended Forecast

Issued 03:00 AM EDT 11 March 2026
Friday Wind northwest 15 knots increasing to southwest 25 in the afternoon.
Saturday Wind west 35 knots diminishing to west 15 late in the day.
Sunday Wind east 20 knots increasing to east 30.

Ice Forecast*

Issued 12:00 PM EDT 10 March 2026 Today Tonight and Wednesday Open water except 2 tenths thick lake ice in the northeastern section. Consolidated thick lake ice along parts of the shore and in the Bay of Quinte.

*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
Legend:
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land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 10 March 2026 Today Tonight and Wednesday

Ice Coverage

Open water except 2 tenths thick lake ice in the northeastern
section. Consolidated thick lake ice along parts of the shore and in
the Bay of Quinte.

Warnings

Warnings (In effect)

Gale warning in effect

Eastern Lake Ontario

Issued 03:00 AM 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 3:00 AM EDT 11 March 2026 Today Tonight and Thursday At 3:00 a.m. EDT today deepening low 1003 mb located over northern
Illinois.
By 3:00 a.m. EDT Thursday low 988 mb located over southern Quebec.

At 3:00 a.m. EDT today departing high 1031 mb located east of
James Bay.

By 3:00 a.m. EDT Thursday ridge located on a line north-south over
northwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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