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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 07:17 AM EDT 17 March 2026

Today Tonight and Wednesday.

Storm warning in effect.

Wind southwest 40 to 50 knots diminishing to southwest 30 to 40 near noon and to west 15 to 25 early this evening. Wind diminishing to southwest 10 to 15 near midnight then backing to southeast 10 to 15 Wednesday evening.

Flurries ending this evening. Visibility 1 mile or less in flurries.

High today zero. Low tonight minus 13. High Wednesday minus 4.

Extended Forecast

Issued 06:00 AM EDT 17 March 2026
Thursday Wind southerly 10 to 20 knots.
Friday Wind southerly 10 to 20 knots veering to west 15 to 25 late in the day.
Saturday Wind west 15 knots diminishing to light.

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

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Storm warning in effect

Cornwall to Montréal

Issued 07:17 AM EDT 17 March 2026

'Storm' force winds of 48 to 63 knots are occurring or expected to occur in this marine area. 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 17 March 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today intensifying low 978 mb located over western
Lake Saint-Jean.
By 8:00 a.m. EDT Wednesday departing low 946 mb located over
eastern Ungava Bay.

At 3:00 a.m. EDT today ridge located on a line north-south over
western Lake Superior.
By 8:00 p.m. EDT Wednesday ridge located on a line
northwest-southeast over Rimouski.

At 5:00 a.m. EDT Wednesday low located over western Manitoba.
By 8:00 p.m. EDT Wednesday low located over northern Lake Superior.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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