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Northumberland Strait - western half

Warnings

Forecast

Marine Forecast

Issued 03:00 AM AST 13 December 2025

Today Tonight and Sunday.

Wind northwest 25 to 30 knots diminishing to west 20 this morning and to west 10 to 15 early this evening. Wind diminishing to light after midnight then increasing to north 20 Sunday evening.

Scattered flurries Sunday evening.

Risk of freezing spray today.

Temperatures near minus 4.

Extended Forecast

Issued 03:00 AM AST 13 December 2025
Monday Wind northerly 25 knots increasing to northerly 40 in the afternoon.
Tuesday Wind northwest 35 knots diminishing to northwesterly 25.
Wednesday Wind southwest 20 to 25 knots.

Ice Forecast

Issued 10:00 AM EST 12 December 2025 Today Tonight and Saturday Open water except 5 tenths new ice including 2 tenths grey ice along parts of the coasts. 

[ 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 12 December 2025 Today Tonight and Saturday

Ice Edge

First ice edge estimated from 4723N 6136W to 4738N 6112W to 4744N
6124W to 4734N 6159W to 4706N 6212W to 4706N 6147W to 4723N 6136W.
Sea ice within the ice edge.

Second ice edge estimated from Nova Scotia near 4551N 6201W to
Prince Edward Island near 4621N 6211W. Sea ice west of the ice edge.

Third ice edge estimated from Prince Edward Island near 4628N 6231W
to 4640N 6329W to 4736N 6409W to 4904N 6404W to 4925N 6516W to 4916N
6703W to 4956N 6635W to Anticosti Island near 4924N 6336W. Sea ice
west then north of the ice edge.

Fourth ice edge estimated from Anticosti Island near 4945N 6301W to
4946N 5954W to 5106N 5804W to Newfoundland near 5029N 5728W. Sea ice
north of the ice edge.

Ice Coverage

Open water except 5 tenths new ice including 2 tenths grey ice along
parts of the coasts.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM AST 13 December 2025 Today Tonight and Sunday At 3:00 a.m. AST today departing low 955 mb located east of
Labrador Sea.

At 3:30 p.m. AST Sunday low 1013 mb located southwest of Georges
Bank.
By 8:00 p.m. AST Sunday low 999 mb located over West Scotian Slope.

At 10:00 a.m. AST today ridge located from Quebec to the Gulf
of Maine.
By 8:00 p.m. AST tonight weakening ridge located from New Brunswick
to East Scotian Slope.

Marine Weather Statement

Issued 2:50 AM AST 13 December 2025 An intense low pressure system east of the Labrador Sea will continue
slowly tracking eastward today. Strong to gale force westerly winds
will diminish through the day today.

A second low pressure system will approach the slope waters from the
southwest on Sunday and lie over West Scotian Slope Sunday evening.
Strong to gale force southwest winds are forecast southeast of the
low with strong to possibly gale force northerly winds expected to
the northwest of it.

Marine interests are advised that gale warnings are in effect for
East Scotian Slope, Banquereau, Laurentian Fan, and Cabot Strait -
northern half.

St. Lawrence - St. Lawrence River Area

Another Region

Marine Weather for Canada

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