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Prescott to Cornwall

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 19 August 2026

Tonight and Thursday.

Wind light tonight and Thursday.

Scattered showers this evening with a risk of thunderstorms. Scattered showers Thursday evening. Fog patches forming near midnight and dissipating near noon Thursday.

Extended Forecast

Issued 06:30 PM EDT 19 August 2026
Friday Wind light.
Saturday Wind light becoming south 15 knots late in the day.
Sunday Wind south 15 knots veering to west 15 late in the day.

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Map of St. Lawrence - St. Lawrence River marine weather areas Grand Manan New Carlisle Pointe-au-Père Fundy Park (Alma) Port Menier Miramichi Île Bicquette Charlo Cap-Chat Bathurst Airport CFB Bagotville Jonquière Mistook Normandin Roberval Airport Île-d'Orléans - Quai de St-Jean Deschambault North Bay Airport Beauport L'Isle-aux-Grues Bas Caraquet Lake Nipissing - 45152 Pointe-des-Monts L'Assomption Baie-Comeau Airport Saint-Anicet Cap-Rouge Sainte-Anne-de-Bellevue Lac Memphrémagog Montréal Metropolitain Airport Île Rouge Montréal-Trudeau Int'l Airport Lac Saint-Pierre Trois-Rivières Airport Pointe de l'Islet Pointe Claveau Sept-Îles Airport Kouchibouguac 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 La Pocatière Miscou Island Mont-Joli Airport
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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

Prescott to Cornwall

Issued 8:39 PM EDT 19 August 2026 Squalls with wind gusts up to 35 knots are expected or occurring in the area.


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 19 August 2026 Tonight and Thursday At 6:30 p.m. EDT tonight trough from low located on a line
northeast-southwest over Saskatchewan.
By 6:30 p.m. EDT Thursday trough from low located on a line
northwest-southeast over the Ontario - Manitoba border.

At 6:30 p.m. EDT tonight departing cold front located on a line
northeast-southwest over the southern Ontario - Quebec border.

At 6:30 p.m. EDT tonight ridge located on a line north-south over
the Ontario - Manitoba border.
By 6:30 p.m. EDT Thursday high 1020 mb located over southern
Ontario.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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