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L'Isle-aux-Coudres to Tadoussac

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 17 March 2026

Today Tonight and Wednesday.

Storm warning in effect.

Wind southerly 20 to 30 knots except south 50 near the coast. Wind becoming southwest 40 to 50 early this morning then diminishing to southwest 25 to 35 early this evening. Wind diminishing to southwest 15 to 20 near midnight. Wind southwest 15 to 20 Wednesday.

Showers changing to flurries this morning and ending this evening. Visibility 1 mile or less in flurries.

Freezing spray warning in effect.

Freezing spray tonight. Risk of freezing spray late overnight and Wednesday.

High today plus 11. Low tonight minus 14. High Wednesday minus 8.

Waves

Issued 03:00 AM EDT 17 March 2026
Today Tonight and Wednesday. Over open water seas 1 metre or less building to 1 to 2 early this morning and to 2 to 3 late this morning. Seas subsiding to 2 this evening.

Extended Forecast

Issued 06:00 AM EDT 17 March 2026
Thursday Wind southwest 10 to 20 knots.
Friday Wind light.
Saturday Wind west 15 knots diminishing to light.

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

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Storm warning in effect

L'Isle-aux-Coudres to Tadoussac

Issued 09:17 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.

Freezing spray warning in effect

L'Isle-aux-Coudres to Tadoussac

Issued 09:17 AM EDT 17 March 2026

Moderate or severe freezing spray is 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.

St. Lawrence - St. Lawrence River Area

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