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Warnings

Forecast

Marine Forecast

Issued 03:00 AM AST 06 December 2025

Today Tonight and Sunday.

Wind southwest 10 to 15 knots diminishing to light early this morning then becoming south 15 early this evening. Wind veering to west 10 to 15 near midnight then to northwest 15 Sunday morning. Wind diminishing to light Sunday evening.

Waves

Issued 05:00 PM AST 05 December 2025
Tonight and Saturday. Seas 1 to 2 metres subsiding to 1 or less after midnight.

Extended Forecast

Issued 03:00 AM AST 06 December 2025
Monday Wind northeast 15 knots increasing to northwest 25 to 35 in the afternoon.
Tuesday Wind northwest 20 knots backing to southwest 20.
Wednesday Wind southwest 25 knots.

Ice Forecast

Issued 10:00 AM EST 5 December 2025 Today Tonight and Saturday 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 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 Montréal Metropolitain 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

Ice Forecasts

Issued 10:00 AM EST 5 December 2025 Today Tonight and Saturday

Ice Edge

First ice edge estimated from New Brunswick near 4705N 6450W to
4758N 6416W to Gaspe Peninsula near 4830N 6413W. Sea ice east of the
ice edge.

Second ice edge estimated from Gaspe Peninsula near 4856N 6712W to
4956N 6635W to 4958N 6014W to Quebec near 5125N 5737W. Sea ice north
of the ice edge.

Ice Coverage

Ice free.

 

Iceberg Bulletin

Issued 1:30 PM EST 5 December 2025

Iceberg Limit

Iceberg limit at 0000 UTC 6 Dec estimated from Newfoundland near
4830N 5310W to 4900N 4815W to 5000N 4700W to 5100N 4730W to 5945N
5730W to 6120N 5340W then eastward.

Iceberg Count

No confirmed icebergs.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM AST 6 December 2025 Today Tonight and Sunday At 3:00 a.m. AST today departing low 960 mb located northeast
of Newfoundland.

At 3:00 a.m. AST Sunday low 1004 mb located near the St. Lawrence
River.
By 3:30 p.m. AST Sunday low 1000 mb located over the northeastern
Gulf of St. Lawrence.

At 3:00 a.m. AST today ridge located over the western Marine
District.
By 8:00 p.m. AST tonight ridge located over the eastern Marine
District.

Marine Weather Statement

Issued 7:32 PM AST 5 December 2025 An intense low pressure system northeast of Newfoundland will slowly
track eastward and away from the region tonight. A ridge of high
pressure over the western marine district will move to lie over the
eastern marine district by Saturday evening. Gale to storm force
northwesterlies are expected between these two features with light to
moderate winds under the ridge.

Marine interests are advised that a storm warning is in effect for
Banquereau. Gale warnings are in effect for eastern shore - eastern
half, Sable - eastern half, East Scotian Slope - eastern half,
Fourchu, Laurentian Fan, Cabot Strait, Gulf-Magdalen , Chaleur-Miscou
- eastern half, and Anticosti - southeastern half.

Marine interests are also advised that freezing spray warnings are in
effect for Cabot Strait and all Gulf of St Lawrence waters.

St. Lawrence - St. Lawrence River Area

Another Region

Marine Weather for Canada

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