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Warnings

Forecast

Marine Forecast

Issued 08:00 PM ADT 21 April 2026

Tonight and Wednesday.

Wind variable 10 to 15 knots diminishing to light near midnight then becoming southwest 10 to 15 Wednesday afternoon.

Waves

Issued 05:00 PM ADT 21 April 2026
Tonight and Wednesday. Seas 1 metre or less.

Extended Forecast

Issued 03:30 PM ADT 21 April 2026
Thursday Wind south 15 knots becoming variable 10 to 15 in the afternoon.
Friday Wind variable 10 to 15 knots becoming northwest 15.
Saturday Wind northerly 20 knots.

Ice Forecast

Issued 10:00 AM EDT 21 April 2026 Today Tonight and Wednesday Ice free. 

[ Canadian Ice Service ]

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Weather Conditions

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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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Ice Conditions

Ice Forecasts

Issued 10:00 AM EDT 21 April 2026 Today Tonight and Wednesday

Ice Edge

First ice edge estimated from Cape Breton Island near 4702N 6025W to
4745N 6115W to Gaspe Peninsula near 4846N 6410W. Sea ice southwest
of the ice edge.

Second ice edge estimated from Quebec near 4920N 6722W to 5005N
6558W to 4841N 6158W to 4957N 6006W to 4935N 5822W to 4836N 5937W to
Newfoundland near 4806N 5905W. Sea ice north of the ice edge.

Ice Coverage

Ice free.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 8:00 PM ADT 21 April 2026 Tonight and Wednesday At 8:00 p.m. ADT tonight ridge located from Labrador to the Gulf
of Maine.
By 3:30 p.m. ADT Wednesday quasi-stationary ridge located from
Labrador to Browns Bank.

At 8:00 p.m. ADT tonight low 1004 mb located south of Laurentian
Fan.
By 3:30 p.m. ADT Wednesday low 1001 mb located near the Avalon
Peninsula.

Marine Weather Statement

Issued 7:32 PM ADT 21 April 2026 A low pressure system south of Laurentian Fan this evening will move
northeast tonight to lie near the Avalon Peninsula by Wednesday
afternoon. Strong to gale force northerly winds will develop on the
western side of the low tonight.

Marine interests are advised that a gale warning is in effect for
Laurentian Fan - southeastern half.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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