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Prescott to Cornwall

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 21 July 2026

Tonight and Wednesday.

Wind southwest 15 knots diminishing to southwest 10 this evening then increasing to southwest 15 early Wednesday morning. Wind veering to west 15 Wednesday afternoon then diminishing to west 10 Wednesday evening.

Scattered showers. Risk of thunderstorms tonight.

Extended Forecast

Issued 06:30 PM EDT 21 July 2026
Thursday Wind light.
Friday Wind light.
Saturday Wind light.

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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

There is no ice forecast issued for this area.

Warnings

Watches (In effect)

Squall watch in effect

Prescott to Cornwall

Issued 8:31 PM EDT 21 July 2026 Thunderstorms capable of wind gusts up to 35 knots linger early this evening.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 21 July 2026 Tonight and Wednesday At 6:30 p.m. EDT tonight trough from 991 mb low located on a line
north-south over Lake Simcoe.
By 6:30 p.m. EDT Wednesday trough from 993 mb low located on a
line north-south over Maine.

At 6:30 p.m. EDT tonight ridge located on a line northwest-southeast
over North Dakota.
By 6:30 p.m. EDT Wednesday ridge located on a line
northwest-southeast over Wisconsin.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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