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Anticosti - northwestern half

Warnings

Forecast

Marine Forecast

Issued 08:00 PM AST 10 December 2025

Tonight and Thursday.

Gale warning in effect.

Wind northeast 15 knots increasing to northeast 25 to 30 after midnight and to northeasterly 35 Thursday morning. Wind diminishing to northerly 25 late Thursday afternoon and to northwest 15 Thursday evening.

Snow overnight and Thursday. Visibility 1 mile or less in snow.

Freezing spray warning in effect.

Freezing spray beginning Thursday morning and ending Thursday evening.

Temperatures near minus 4.

Waves

Issued 05:00 PM AST 10 December 2025
Tonight and Thursday. Seas 1 metre or less building to 1 to 2 early Thursday morning and to 2 to 3 near noon Thursday. Seas subsiding to 1 to 2 Thursday evening.

Extended Forecast

Issued 03:30 PM AST 10 December 2025
Friday Wind west 30 knots.
Saturday Wind northwest 25 knots.
Sunday Wind west 20 knots increasing to easterly 25.

Ice Forecast

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

 

Iceberg Bulletin

Issued 1:30 PM EST 10 December 2025

Iceberg Limit

Iceberg limit at 0000 UTC 11 Dec estimated from Newfoundland near
4730N 5239W to 4745N 5030W to 5230N 5000W to 5945N 5730W to 6155N
5330W to 6005N 4945W then northeastward.

Iceberg Count

No confirmed icebergs.
Warnings

Warnings (In effect)

Gale warning in effect

Anticosti - northwestern half

Issued 8:00 PM AST 10 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

Anticosti - northwestern half

Issued 8:00 PM AST 10 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 10 December 2025 Tonight and Thursday At 8:00 p.m. AST tonight trough located over East Scotian Slope.
By 3:00 a.m. AST Thursday departing trough located over Banquereau.

At 8:00 p.m. AST tonight low 990 mb located over southern Quebec.
By 3:30 p.m. AST Thursday low 982 mb located over the northern
Gulf of St. Lawrence.

Marine Weather Statement

Issued 7:44 PM AST 10 December 2025 A trough of low pressure over East Scotian Slope will track
northeastward across the southern marine district this evening.
Strong to gale force southerly winds are forecast ahead of this
feature.

A low pressure system over Southern Quebec 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, Banquereau -
southeastern half, Laurentian Fan and Anticosti - northwestern half.

Additionally, a freezing spray warning is in effect for Anticosti -
northwestern half.

St. Lawrence - St. Lawrence River Area

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Marine Weather for Canada

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