Marine Forecast
Issued 03:00 AM EST 18 December 2025
Today Tonight and Friday.
Storm warning in effect.
Wind southwest 15 to 25 knots backing to southeasterly 20 to 30
Friday morning then increasing to southeasterly 40 to 50 Friday
afternoon.
Rain Friday.
Temperatures minus 4 rising to plus 7 then falling to plus 2
Friday evening.
Strong wind warning program has ended for the season.
Winds
Issued 03:00 AM EST 18 December 2025
Today Tonight and Friday.
Storm warning in effect.
Wind southwest 15 to 25 knots backing to southeasterly 20 to 30
Friday morning then increasing to southeasterly 40 to 50 Friday
afternoon.
Strong wind warning program has ended for the season.
Waves
Issued 03:00 AM EST 18 December 2025
Today Tonight and Friday.
Seas 1 metre.
Weather & Visibility
Issued 03:00 AM EST 18 December 2025
Today Tonight and Friday.
Rain Friday.
Air temperature
Issued 03:00 AM EST 18 December 2025
Today Tonight and Friday.
Temperatures minus 4 rising to plus 7 then falling to plus 2
Friday evening.
Ice Forecasts
Issued 10:00 AM EST 18 December 2025 Today Tonight and Friday 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
Open water except 3 tenths new ice including 1 tenth grey ice along
parts of the coasts.
Warnings (In effect)
Pointe à Michel to Pointe-des-Monts
Issued 03:00 AM EST 18 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.
Technical Marine Synopsis
Issued 3:00 AM EST 18 December 2025 Today Tonight and Friday At 3:00 a.m. EST today ridge located on a line north-south over
Trois-Rivières.
By 7:00 p.m. EST tonight departing ridge located on a line
northwest-southeast over the Gulf of St. Lawrence.
At 7:00 p.m. EST tonight low 989 mb located over Lake Superior.
By 7:00 p.m. EST Friday low 972 mb located north of Lake Saint-Jean.