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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 17 July 2025

Tonight and Friday.

Strong wind warning in effect.

Wind southwest 20 to 30 knots with gusts to 50 near thunderstorms. Wind becoming northwest 15 to 25 early this evening then becoming westerly 15 early Friday morning.

Showers ending this evening with a risk of thunderstorms. Visibility 1 mile or less in showers.

Extended Forecast

Issued 06:00 AM EDT 17 July 2025
Saturday Wind southwest 10 to 15 knots increasing to southwest 15 to 20 in the morning.
Sunday Wind southwest 10 to 15 knots veering to northwest 10 to 15.
Monday Wind northwest 10 to 15 knots.

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Map of St. Lawrence - St. Lawrence River marine weather areas Cap-Chat Mont-Joli Airport Bathurst Airport Île Bicquette Charlo Port Menier Miramichi Pointe-au-Père Fundy Park (Alma) New Carlisle Grand Manan Bas Caraquet CFB Bagotville Jonquière Mistook Normandin Roberval Airport Deschambault Beauport North Bay Airport Trois-Rivières Airport Lake Nipissing - 45152 Kouchibouguac Baie-Comeau Airport Île d'Orléans Saint-Anicet Sainte-Anne-de-Bellevue Cap-Rouge Lac Memphrémagog Saint-Hubert Airport Montréal-Trudeau Int'l Airport Île Rouge Lac Saint-Pierre L'Isle-aux-Grues L'Assomption Pointe de l'Islet Pointe Claveau Sept-Îles Airport Pointe-des-Monts North Cape Pointe-Noire Yarmouth Airport Cap-d'Espoir Brier Island Rivière-la-Madeleine St. Stephen Gaspé Airport Saint John Airport Point Lepreau Greater Moncton Roméo LeBlanc Int'l Airport Miscou Island Kouchibouguac La Pocatière
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land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Squall warning in effect

Cornwall to Montréal

Issued 3:10 PM EDT 17 July 2025 Squalls with wind gusts up to 40 knots are expected or occurring in the area.



Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately.

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

Strong wind warning in effect

Cornwall to Montréal

Issued 3:00 PM EDT 17 July 2025

'Strong' winds of 20 to 33 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 PM EDT 17 July 2025 Tonight and Friday At 3:00 p.m. EDT today low 1001 mb located over southern Quebec.
By 8:00 p.m. EDT Friday low 988 mb located over Labrador.

At 3:00 p.m. EDT today high located south of Manitoba.
By 8:00 p.m. EDT Friday high located over Lake Ontario.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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