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Northumberland Strait

Warnings

Forecast

Marine Forecast

Issued 10:00 AM AST 10 December 2025

Today Tonight and Thursday.

Wind southerly 20 to 25 knots diminishing to westerly 15 this afternoon and to light early this evening. Wind increasing to southeast 20 near midnight then veering to southerly 25 late overnight. Wind veering to southwest 20 near noon Thursday.

Flurries near noon becoming showers or flurries and ending late this afternoon. Snow beginning this evening and changing to rain near midnight and ending near noon Thursday. Visibility 1 mile or less in snow.

Temperatures minus 2 rising to plus 5 Thursday afternoon then falling to zero Thursday evening.

Extended Forecast

Issued 03:00 AM AST 10 December 2025
Friday Wind west 40 knots.
Saturday Wind west 25 knots.
Sunday Wind west 20 knots increasing to southeast 25.

Ice Forecast

Issued 10:00 AM EST 10 December 2025 Today Tonight and Thursday Open water except 7 tenths new ice including 1 tenth 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 10 December 2025 Today Tonight and Thursday

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 4949N 6317W to
4946N 5954W to 5106N 5804W to Newfoundland near 5029N 5728W. Sea ice
north of the ice edge.

Ice Coverage

Open water except 7 tenths new ice including 1 tenth grey ice along
parts of the coasts.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:00 AM AST 10 December 2025 Today Tonight and Thursday At 10:00 a.m. AST today trough located south of Georges Bank.
By 3:00 a.m. AST Thursday trough located east of the Marine
District.

At 8:00 p.m. AST tonight low 990 mb located over southern Ontario.
By 3:30 p.m. AST Thursday low 986 mb located over the northern
Gulf of St. Lawrence.

Marine Weather Statement

Issued 9:37 AM AST 10 December 2025 A trough of low pressure will track northeastward across the southern
marine district today. Strong to gale force southerly winds will
develop ahead of this feature.

A low pressure system developing over Southern Ontario will track
across New Brunswick Thursday morning to lie over Northern Gulf of
St. Lawrence waters Thursday afternoon. Strong to gale force easterly
winds are forecast ahead of the low. Strong to gale force westerly
winds are expected south of the low late in the day Thursday.

Marine interests are advised that gale warnings are in effect for
Grand Manan, Lurcher, Browns Bank, Georges Bank, southwestern shore,
LaHave Bank, West Scotian Slope, East Scotian Slope, Laurentian Fan
and Anticosti - northwestern half.

Additionally, a freezing spray warning is in effect Anticosti.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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