Larsen Marine Forecast, Warnings and Alerts

Canada

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Laurentian Fan

Marine Forecast

Issued 03:00 AM AST 18 December 2025

Today Tonight and Friday.

Gale warning in effect.

Wind southwest 35 knots veering to northwest 35 this morning then diminishing to northwest 20 this afternoon. Wind diminishing to light this evening then increasing to southwest 20 overnight. Wind increasing to south 30 Friday afternoon and to south 40 Friday evening.

Showers ending this morning.

Winds

Issued 03:00 AM AST 18 December 2025

Today Tonight and Friday. Gale warning in effect. Wind southwest 35 knots veering to northwest 35 this morning then diminishing to northwest 20 this afternoon. Wind diminishing to light this evening then increasing to southwest 20 overnight. Wind increasing to south 30 Friday afternoon and to south 40 Friday evening.

Waves

Issued 05:00 AM AST 18 December 2025

Today Tonight and Friday. Seas 3 to 5 metres subsiding to 2 to 3 this evening then building to 3 to 4 Friday evening.

Weather & Visibility

Issued 03:00 AM AST 18 December 2025

Today Tonight and Friday. Showers ending this morning.

Ice Forecasts

Issued 10:00 AM EST 17 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 4540N 6136W 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 5035N 5733W to 4818N 5929W to 4731N
5923W to Newfoundland near 4736N 5740W. Sea ice north then east of
the ice edge.

Ice Coverage

Ice free.

Iceberg Bulletin

Issued 1:30 PM EST 17 December 2025

Iceberg Limit

Iceberg limit at 0000 UTC 18 Dec estimated from Newfoundland near
5020N 5628W to 5030N 5500W to 5330N 5200W to 5945N 5730W to 6155N
5330W to 6005N 4945W to 5900N 4600W then northeastward.

Iceberg Count

No confirmed icebergs.

Warnings (In effect)

Gale warning in effect

Laurentian Fan

Issued 03:00 AM AST 18 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.

Technical Marine Synopsis

Issued 3:00 AM AST 18 December 2025 Today Tonight and Friday At 3:00 a.m. AST today trough located over the southeastern Marine
District.
By 10:00 a.m. AST today departing trough located over the Grand
Banks.

At 10:00 a.m. AST Friday intensifying trough located over New
England.
By 8:00 p.m. AST Friday trough located over the western Marine
District.

At 10:00 a.m. AST today high located over the Gulf of Maine.
By 8:00 p.m. AST tonight departing high located over Laurentian Fan.

Marine Weather Statement

Issued 2:52 AM AST 18 December 2025 A trough of low pressure over southeastern waters will move east of
the area this morning. Strong to gale force southwesterlies ahead of
the trough will shift to strong to gale force northwesterlies in its
wake.

A trough of low pressure will approach the Maritimes from the west on
Friday and deepen as it moves to lie over the western marine district
Friday evening. Winds will strengthen to gale to storm force
southerlies ahead of the trough.

Marine interests are advised that storm warnings are in effect for
Grand Manan, Lurcher, Browns Bank, Georges Bank, southwestern shore,
LaHave Bank, West Scotian Slope, eastern shore, Sable, East Scotian
Slope, Gulf-Magdalen and Anticosti - southeastern half. Gale warnings
are in effect for all remaining waters.

Marine interests are also advised that a freezing spray warning is in
effect for Anticosti - northwestern half.

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