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Northumberland Strait - western half

Warnings

Forecast

Marine Forecast

Issued 08:00 PM AST 11 December 2025

Tonight and Friday.

Gale warning in effect.

Wind southwesterly 20 to 25 knots increasing to west 35 late Friday morning then diminishing to northwest 30 Friday evening.

Flurries tonight and Friday. Visibility 1 mile or less in flurries.

Freezing spray warning in effect.

Freezing spray beginning after midnight and ending Friday evening.

Temperatures minus 1 falling to minus 6 Friday afternoon.

Extended Forecast

Issued 03:30 PM AST 11 December 2025
Saturday Wind west 25 knots.
Sunday Wind west 20 knots increasing to southeast 25.
Monday Wind northerly 25 knots increasing to northerly 40.

Ice Forecast

Issued 10:00 AM EST 11 December 2025 Today Tonight and Friday Open water except 3 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 11 December 2025 Today Tonight and Friday

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 3 tenths new ice including 1 tenth grey ice along
parts of the coasts.

Warnings

Warnings (In effect)

Gale warning in effect

Northumberland Strait - western half

Issued 8:00 PM AST 11 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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

Northumberland Strait - western half

Issued 8:00 PM AST 11 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 8:00 PM AST 11 December 2025 Tonight and Friday At 8:00 p.m. AST tonight departing trough located over the Grand
Banks.

At 8:00 p.m. AST tonight low 982 mb located near Anticosti Island.
By 8:00 p.m. AST Friday departing low 968 mb located over Labrador
Sea.

Marine Weather Statement

Issued 7:45 PM AST 11 December 2025 A low pressure system near Anticosti Island will continue slowly
moving north-northeastward to lie over the Strait of Belle Isle by
Friday afternoon. Strong to gale force westerly winds will intensify
south of the low. On Friday, westerly winds will intensify to storm
force strength over southeastern waters. Winds will begin to diminish
Friday night as the low departs the region to the northeast.

Marine interests are advised that storm warnings are in effect for
East Scotian Slope and Laurentian Fan. Gale warnings are in effect
for all remaining waters except Northwestern Anticosti.

Additionally, freezing spray warnings are in effect for Fundy, Grand
Manan, Northumberland Strait, Gulf-Magdalen, and Chaleur-Miscou.

St. Lawrence - St. Lawrence River Area

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