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Cabot Strait

Warnings

Forecast

Marine Forecast

Issued 03:30 PM AST 04 December 2025

Tonight and Friday.

Storm warning in effect.

Wind southwest 15 knots increasing to southerly 25 late this afternoon and to northwest 35 near midnight. Wind increasing to northwest 45 late overnight and to northwest 55 Friday morning. Wind diminishing to northwest 40 Friday evening.

Showers changing to flurries after midnight. Visibility 1 mile or less in flurries.

Freezing spray warning in effect.

Freezing spray beginning overnight and ending Friday evening.

Temperatures plus 3 falling to minus 5 Friday morning.

Waves

Issued 05:00 PM AST 04 December 2025

Cabot Strait - northern half

Tonight and Friday. Seas 1 to 2 metres building to 2 to 3 this evening and to 4 to 6 late overnight. Seas building to 6 to 8 near noon Friday.

Cabot Strait - southern half

Tonight and Friday. Seas 1 to 2 metres building to 2 to 3 this evening and to 4 to 6 early Friday morning.

Extended Forecast

Issued 03:30 PM AST 04 December 2025
Saturday Wind northwest 35 knots diminishing to northwest 20 in the afternoon.
Sunday Wind westerly 20 knots.
Monday Wind light increasing to northerly 30 knots.

Ice Forecast

Issued 10:00 AM EST 4 December 2025 Today Tonight and Friday Ice free. 

[ Canadian Ice Service ]

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Weather Conditions

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Map of Atlantic - Newfoundland marine weather areas Eskasoni (First Nations) Heath Point Bonavista Wreckhouse St.Paul Island Winterland Branch Hill Twillingate Stephenville Airport Burgeo St. Lawrence St. John's Int'l Airport St. Anthony Airport Grates Cove Cape Race Grand Étang Sagona Island North Mountain Port aux Basques Ingonish Beach La Scie Ferolle Point Englee Daniel's Harbour Corner Brook Cartwright Airport East Point West Chedabucto Bay – 44489 Blanc-Sablon Airport East Chedabucto Bay – 44488 Cap Whittle Chevery Banquereau - 44139 Charlottetown Airport Mary's Harbour North Cape Natashquan Airport Argentia J.A. Douglas McCurdy Sydney Airport Berry Hill Long Pond Îles de la Madeleine Airport Miscou Island Marticot Island Pool's Island
Legend:
buoy Buoy
land station Land Station
Ice Conditions

Ice Forecasts

Issued 10:00 AM EST 4 December 2025 Today Tonight and Friday

Ice Edge

Ice edge estimated from Gaspe Peninsula near 4856N 6712W to 4956N
6635W to 4958N 6014W to Quebec near 5125N 5737W. Sea ice north of
the ice edge.

Ice Coverage

Ice free.

 

Iceberg Bulletin

Issued 1:30 PM EST 4 December 2025

Iceberg Limit

Iceberg limit at 0000 UTC 5 Dec estimated from Newfoundland near
4900N 5350W to 4900N 4815W to 5000N 4700W to 5100N 4730W to 5945N
5730W to 6120N 5340W then eastward.

Iceberg Count

No confirmed icebergs.
Warnings

Warnings (In effect)

Storm warning in effect

Cabot Strait

Issued 3:30 PM AST 04 December 2025

'Storm' force winds of 48 to 63 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.

Freezing spray warning in effect

Cabot Strait

Issued 3:30 PM AST 04 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 3:30 PM AST 4 December 2025 Tonight and Friday At 3:30 p.m. AST today trough located from Labrador to Cape Cod.
By 3:00 a.m. AST Friday trough from 987 mb low located from the
Quebec Lower North Shore to Laurentian Fan.

At 3:30 p.m. AST Friday low 966 mb located east of Newfoundland.

At 3:30 p.m. AST Friday ridge located west of the Marine District.

Marine Weather Statement

Issued 3:17 PM AST 4 December 2025 An intensifying trough of low pressure approaching from the west will
move east to lie over the Gulf of St. Lawrence by evening, and east
of Newfoundland by Friday afternoon. Gale to storm force westerlies
will develop in the wake of the trough.

Marine interests are advised that storm warnings are in effect for
Banquereau, Cabot Strait, Gulf - Magdalen - northeastern half, and
Anticosti - southeastern half. Gale warnings are in effect for
remaining waters.

Marine interests are also advised that freezing spray warnings are in
effect for all waters except Georges Bank, West Scotian Slope, East
Scotian Slope, and Laurentian Fan.

Atlantic - Newfoundland Area

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Marine Weather for Canada

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