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Warnings

Forecast

Marine Forecast

Issued 03:30 PM ADT 18 April 2026

Tonight and Sunday.

Strong wind warning in effect.

Wind east 25 knots veering to southeast 15 to 20 late overnight then diminishing to south 10 to 15 Sunday morning. Wind increasing to south 20 Sunday afternoon and to south 25 to 30 Sunday evening.

Showers tonight and Sunday morning. Rain Sunday evening with a risk of thunderstorms. Fog patches.

Waves

Issued 05:00 PM ADT 18 April 2026
Tonight and Sunday. Seas 2 to 3 metres subsiding to 1 to 2 late overnight.

Extended Forecast

Issued 03:30 PM ADT 18 April 2026
Monday Wind northwest 25 knots diminishing to northwest 15 in the afternoon.
Tuesday Wind north 20 knots diminishing to variable 10 to 15.
Wednesday Wind variable 10 to 15 knots increasing to south 20.

Ice Forecast

Issued 10:00 AM EDT 18 April 2026 Today Tonight and Sunday Ice free. 

[ 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 EDT 18 April 2026 Today Tonight and Sunday

Ice Edge

First ice edge estimated from Cape Breton Island near 4702N 6025W to
4745N 6115W to Gaspe Peninsula near 4846N 6410W. Sea ice southwest
of the ice edge.

Second ice edge estimated from Quebec near 4838N 6811W to 5005N
6600W to 4945N 6015W to Newfoundland near 4806N 5905W. Sea ice north
of the ice edge.

Ice Coverage

Ice free.

Warnings

Warnings (In effect)

Strong wind warning in effect

Lurcher

Issued 3:30 PM ADT 18 April 2026

'Strong' winds of 20 to 33 knots are 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 3:30 PM ADT 18 April 2026 Tonight and Sunday At 3:30 p.m. ADT today low 1012 mb located southwest of Georges
Bank.
By 3:00 a.m. ADT Sunday dissipating low located near Browns Bank.

At 3:30 p.m. ADT today ridge located over Newfoundland.
By 8:00 p.m. ADT tonight ridge located east of the Avalon Peninsula.

At 10:00 a.m. ADT Sunday trough located from Quebec to New England.
By 8:00 p.m. ADT Sunday trough located from Labrador to the Gulf
of Maine.

Marine Weather Statement

Issued 4:23 PM ADT 18 April 2026 A trough of low pressure extending from a low over Northern Quebec
will slowly approach the marine district tonight and Sunday.
Increasing southerly winds will reach strong to gale force across the
region ahead of the trough on Sunday.

Marine interests are advised that a gale warning is in effect for
Cabot Strait - northern half.

St. Lawrence - St. Lawrence River Area

Another Region

Marine Weather for Canada

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