Cornwall to Montréal
Forecast
Marine Forecast
Issued 03:00 PM EDT 13 July 2025
Tonight and Monday.
Wind south 15 knots diminishing to light this evening then becoming southwest 10 to 15 Monday morning. Wind becoming light Monday evening.
Showers ending near midnight with a risk of thunderstorms. Visibility as low as 1 mile in showers.
Extended Forecast
Issued 06:00 AM EDT 13 July 2025
Tuesday
Wind southwest 10 to 15 knots diminishing to
light late in the day.
Wednesday
Wind light becoming southwest 10 to 15
knots.
Thursday
Wind light.
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Weather Conditions
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Ice Conditions
There is no ice forecast issued for this area.
Warnings
Watches (In effect)
Squall watch in effect
Cornwall to Montréal
Issued 4:57 PM EDT 13 July 2025 This afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 50 knots, frequent lightning and poor to very poor visibilities caused by thunderstorms at times strong.Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Delay travel or if underway, reduce speed or return to port if safe to do so.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Synopsis
Technical Marine Synopsis
Issued 3:00 PM EDT 13 July 2025 Tonight and Monday At 3:00 p.m. EDT today low 988 mb located over James Bay.By 8:00 p.m. EDT Monday low 987 mb located over the Ungava
Peninsula.
At 3:00 p.m. EDT today trough located on a line northwest-southeast
over Lake Saint-Jean.
By 8:00 p.m. EDT Monday trough located on a line northeast-southwest
over Havre Saint-Pierre.
Great Lakes - Lake Huron Area
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