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Anticosti - western half

Warnings

Forecast

Marine Forecast

Issued 03:00 AM AST 05 March 2026

Today Tonight and Friday.

Gale warning in effect.

Wind northwest 25 to 35 knots becoming northwest 25 this morning then diminishing to northwest 15 to 20 overnight. Wind diminishing to light Friday morning then increasing to southerly 15 to 20 Friday evening.

Scattered flurries ending overnight.

Freezing spray warning in effect.

Over open water freezing spray ending overnight.

Temperatures minus 12 rising to minus 8 Friday evening.

Waves

Issued 05:00 PM AST 04 March 2026
Tonight and Thursday. Over open water seas 1 metre or less building to 1 to 2 this evening then subsiding to 1 or less late Thursday morning.

Extended Forecast

Issued 03:00 AM AST 05 March 2026
Saturday Wind southerly 25 knots increasing to south 35 in the afternoon.
Sunday Wind southwest 25 knots veering to northwest 20.
Monday Wind southwest 20 knots.

Ice Forecast

Issued 10:00 AM EST 4 March 2026 Today Tonight and Thursday 5 tenths new ice including 1 tenth grey ice except 8 tenths grey-white ice including 1 tenth first-year ice in the southern section. Consolidated first-year ice along parts of the coasts. 

[ Canadian Ice Service ]

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Map of St. Lawrence - St. Lawrence River marine weather areas Miramichi North Cape Port Menier Roberval Airport Normandin Mistook Jonquière CFB Bagotville Cap-Chat Île Bicquette Charlo North Bay Airport Yarmouth Airport Brier Island St. Stephen Saint John Airport Point Lepreau Greater Moncton Roméo LeBlanc Int'l Airport Miscou Island Kouchibouguac Kouchibouguac Grand Manan Fundy Park (Alma) Bas Caraquet Bathurst Airport Lac Saint-Pierre Pointe-Noire Île d'Orléans Pointe-des-Monts L'Assomption Sept-Îles Airport Pointe Claveau Pointe de l'Islet Trois-Rivières Airport L'Isle-aux-Grues Deschambault Île Rouge Montréal-Trudeau Int'l Airport Montréal Metropolitain Airport Lac Memphrémagog Sainte-Anne-de-Bellevue Cap-Rouge Saint-Anicet Baie-Comeau Airport La Pocatière Pointe-au-Père New Carlisle Mont-Joli Airport Gaspé Airport Lake Nipissing - 45152 Rivière-la-Madeleine Beauport Cap-d'Espoir
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Ice Conditions

Ice Forecasts

Issued 10:00 AM EST 4 March 2026 Today Tonight and Thursday

Ice Edge

Ice edge estimated from 4420N 6720W to 4430N 6635W to 4330N 6615W to
4315N 6515W to 4600N 5845W to 4715N 5915W to 4630N 5615W to
Newfoundland near 4640N 5530W. Sea ice north of the ice edge.

Ice Coverage

5 tenths new ice including 1 tenth grey ice except 8 tenths
grey-white ice including 1 tenth first-year ice in the southern
section. Consolidated first-year ice along parts of the coasts.

 

Iceberg Bulletin

Issued 1:49 PM EST 4 March 2026

Iceberg Limit

Iceberg limit at 0000 UTC 5 Mar estimated from Newfoundland near
4640N 5310W to 4540N 4930W to 4615N 4545W to 4830N 4255W to 5930N
5700W to 6150N 5400W to 5850N 5035W to 5810N 4530W then eastward.

Iceberg Count

No confirmed icebergs.
Warnings

Warnings (In effect)

Gale warning in effect

Anticosti - western half

Issued 03:00 AM AST 05 March 2026

'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 - western half

Issued 03:00 AM AST 05 March 2026

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 March 2026 Today Tonight and Friday At 3:00 a.m. AST today weakening trough located from Newfoundland
to Nova Scotia.

At 3:00 a.m. AST Friday low located south of Long Island.
By 8:00 p.m. AST Friday low located south of Georges Bank.

At 10:00 a.m. AST today building ridge located over the Maritimes.

Marine Weather Statement

Issued 2:50 AM AST 5 March 2026 Strong to gale force northwest winds over northern waters will
diminish somewhat this morning as a ridge of high pressure builds
over the Maritimes.

A low pressure system will slowly approach southwestern waters on
Friday passing just south of Georges Bank by evening. Winds will
increase to strong to gale force easterlies ahead of the low.

Marine interests are advised that gale warnings are in effect for
Georges Bank, West Scotian Slope, Cabot Strait - northern half, Gulf
- Magdalen - northeastern half and Anticosti.

Marine interests are also advised that freezing spray warnings are in
effect for eastern shore, Sable - eastern half, Fourchu, Banquereau,
Cabot Strait, Gulf - Magdalen - northeastern half and Anticosti.

St. Lawrence - St. Lawrence River Area

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