Northumberland Strait
Forecast
Marine Forecast
Issued 10:00 AM ADT 17 July 2025
Today Tonight and Friday.
Strong wind warning in effect.
Wind southwesterly 10 to 15 knots increasing to south 15 to 20 early this evening and to south 20 to 25 near midnight. Wind veering to westerly 20 to 25 Friday afternoon then diminishing to northwest 10 to 15 Friday evening.
Showers overnight and Friday with a risk of thunderstorms.
Extended Forecast
Issued 03:00 AM ADT 17 July 2025
Saturday
Wind northwest 15 to 20 knots backing to
southwest 15 to 20 in the afternoon.
Sunday
Wind southwest 15 to 20 knots diminishing to
light.
Monday
Wind northerly 15 to 20 knots.
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Weather Conditions
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Ice Conditions
Ice Forecasts
Issued 10:00 AM EDT 26 May 2025 Forecasts have ended for the season.Warnings
Warnings (In effect)
Strong wind warning in effect
Northumberland Strait
Issued 10:00 AM ADT 17 July 2025'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 10:00 AM ADT 17 July 2025 Today Tonight and Friday At 10:00 a.m. ADT today low 1003 mb located near the Great Lakes.By 3:00 a.m. ADT Friday low 995 mb located over the St. Lawrence
River.
At 8:00 p.m. ADT Friday low 988 mb located over Labrador.
Marine Weather Statement
Issued 9:51 AM ADT 17 July 2025 A low pressure system over the Great Lakes will intensify as istracks northeastward along the St. Lawrence River tonight to lie over
Labrador on Friday. Strong southerly winds will veer to strong to
gale force westerly winds on Friday in the wake of the system before
diminishing Friday night.
Marine interests are advised that a gale warning is in effect for
Anticosti.
St. Lawrence - St. Lawrence River Area
- Anticosti - northern half
- Anticosti - southern half
- Beauport to L'Isle-aux-Coudres
- Browns Bank
- Chaleur - Miscou - eastern half
- Chaleur - Miscou - western half
- Cornwall to Montréal
- Donnacona to Beauport
- Fundy
- Grand Manan
- Gulf - Magdalen
- Lake Memphrémagog - northern half
- Lake Nipissing
- Lake Saint-Jean
- Lurcher
- L'Isle-aux-Coudres to Tadoussac
- Montréal to Trois-Rivières
- Northumberland Strait
- Pointe à Michel to Pointe-des-Monts
- Pointe-des-Monts to Anticosti - northern half
- Pointe-des-Monts to Anticosti - southern half
- Prescott to Cornwall
- Richelieu River and Northern Lake Champlain
- Saguenay to Tadoussac
- Tadoussac to Pointe à Michel
- Trois-Rivières to Donnacona
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