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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 30 March 2025

Tonight and Monday.

Gale warning in effect.

Wind northeast 15 to 20 knots veering to southeasterly 15 to 20 near midnight then to southwest 10 to 20 early Monday morning. Wind increasing to southwest 25 to 35 late Monday morning then diminishing to northwest 15 to 25 Monday evening.

Freezing rain changing to periods of rain late this afternoon. Mist forming late this afternoon and dissipating Monday morning. Visibility as low as 1 mile in mist.

Low tonight plus 2. High Monday plus 11.

Extended Forecast

Issued 06:00 PM EDT 30 March 2025
Tuesday Wind northwest 10 to 15 knots increasing to northwest 15 to 25 in the morning.
Wednesday Wind northwest 10 to 15 knots diminishing to light.
Thursday Wind easterly 10 to 20 knots becoming southwest 10 to 20.

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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
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buoy Buoy
land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Gale warning in effect

Cornwall to Montréal

Issued 10:32 PM EDT 30 March 2025

'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 PM EDT 30 March 2025 Tonight and Monday At 3:00 p.m. EDT today ridge located from James Bay to Nova Scotia.
By 8:00 a.m. EDT Monday departing ridge located from Ungava Bay
to Newfoundland.

At 3:00 p.m. EDT today low 998 mb located over the Midwestern
states.
By 8:00 p.m. EDT Monday low 992 mb located over Saguenay River.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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