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Anticosti - southeastern half

Warnings

Forecast

Marine Forecast

Issued 03:00 AM AST 05 December 2025

Today Tonight and Saturday.

Storm warning in effect.

Wind northwest 45 knots increasing to northwest 55 near noon then diminishing to northwest 40 early this evening. Wind diminishing to northwest 30 near midnight and to northwest 20 Saturday morning. Wind diminishing to light Saturday afternoon.

Flurries ending Saturday morning. Visibility 1 mile or less in flurries.

Freezing spray warning in effect.

Moderate freezing spray ending Saturday morning except severe this morning.

Temperatures near minus 6.

Waves

Issued 05:00 AM AST 05 December 2025
Today Tonight and Saturday. Seas 3 to 5 metres building to 5 to 7 this morning then subsiding to 3 to 5 this evening. Seas subsiding to 2 to 3 Saturday morning and to 1 to 2 near noon Saturday.

Extended Forecast

Issued 03:00 AM AST 05 December 2025
Sunday Wind south 20 knots increasing to northwest 30 in the afternoon.
Monday Wind northwest 20 knots increasing to northwest 30.
Tuesday Wind west 30 knots.

Ice Forecast

Issued 10:00 AM EST 4 December 2025 Today Tonight and Friday Open water. 

[ Canadian Ice Service ]

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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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Ice Conditions

Ice Forecasts

Issued 10:00 AM EST 4 December 2025 Today Tonight and Friday

Ice Edge

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

Open water.

 

Iceberg Bulletin

Issued 1:30 PM EST 4 December 2025

Iceberg Limit

Iceberg limit at 0000 UTC 5 Dec estimated from Newfoundland near
4900N 5350W to 4900N 4815W to 5000N 4700W to 5100N 4730W to 5945N
5730W to 6120N 5340W then eastward.

Iceberg Count

No confirmed icebergs.
Warnings

Warnings (In effect)

Storm warning in effect

Anticosti - southeastern half

Issued 03:00 AM AST 05 December 2025

'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

Anticosti - southeastern half

Issued 03:00 AM AST 05 December 2025

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 AST 5 December 2025 Today Tonight and Saturday At 3:00 a.m. AST today departing trough located from Newfoundland
to Banquereau.

At 10:00 a.m. AST today intensifying low 976 mb located over
eastern Newfoundland.
By 10:00 a.m. AST Saturday low 955 mb located east of Newfoundland.

At 3:30 p.m. AST today ridge located west of the Marine District.
By 3:30 p.m. AST Saturday ridge located over the central Marine
District.

Marine Weather Statement

Issued 2:37 AM AST 5 December 2025 An intensifying trough of low pressure extending from Labrador to
Browns Bank will move eastward to lie east of the marine district by
Friday morning. Gale to storm force northwesterlies will develop in
the wake of the trough.

Marine interests are advised that storm warnings are in effect for
Banquereau, Cabot Strait, Gulf-Magdalen - northeastern half, and
Anticosti - southeastern half. Gale warnings are in effect for all
remaining waters.

Marine interests are also advised that freezing spray warnings are in
effect for all waters except Georges Bank, West Scotian Slope, East
Scotian Slope, and Laurentian Fan.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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