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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 20 March 2025

Tonight and Friday.

Wind southeast 10 to 15 knots veering to southwesterly 15 late this afternoon then increasing to westerly 15 to 25 near midnight. Wind becoming westerly 15 near noon Friday.

Showers this evening changing to flurries and ending Friday morning. Visibility as low as 1 mile in flurries.

Low tonight minus 2. High Friday plus 7.

Extended Forecast

Issued 06:00 PM EDT 20 March 2025
Saturday Wind southwest 10 to 15 knots increasing to southwest 15 to 25 in the afternoon then veering to northwest 15 to 25 late in the day.
Sunday Wind northwest 15 knots diminishing to light.
Monday Wind southeasterly 10 to 20 knots.

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

There is no ice forecast issued for this area.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 20 March 2025 Tonight and Friday At 3:00 p.m. EDT today low 992 mb located northwest of Lake
Saint-Jean.
By 8:00 p.m. EDT Friday low 986 mb located over Labrador Sea.

At 3:00 p.m. EDT today trough from low located on a line
northeast-southwest over Lake Erie.
By 8:00 p.m. EDT Friday trough from low located on a line
north-south over the Quebec Lower North Shore.

At 3:00 p.m. EDT today ridge located on a line northeast-southwest
over northern Ontario.
By 8:00 p.m. EDT Friday ridge located on a line northeast-southwest
over Cornwall.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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