Language selection

Weather shortcuts

Cornwall to Montréal

Forecast

Marine Forecast

Issued 03:00 PM EDT 24 July 2024

Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 15 knots with gusts to 40 near thunderstorms. Wind diminishing to light near midnight then increasing to southwest 15 to 25 Thursday morning. Wind diminishing to northwest 10 to 15 Thursday evening.

Showers. Risk of thunderstorms late this afternoon and this evening and Thursday afternoon. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 24 July 2024
Friday Wind northwesterly 10 to 15 knots backing to southwesterly 10 to 15 in the afternoon.
Saturday Wind light becoming southwest 10 to 15 knots.
Sunday Wind southwest 10 to 15 knots.

Stay connected

ATOM

Weather Conditions

Skip Image

Zoom-in to make a selection

Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas N Huron - 45003 W Erie - 45005 S Huron - 45008 Lake Ontario - 45012 Port Stanley - 45132 Prince Edward Point - 45135 Georgian Bay - 45137 Grimsby - 45139 Port Colborne - 45142 South Georgian Bay - 45143 Lake St Clair - 45147 South Lake Huron - 45149 Lake Simcoe - 45151 Lake Nipissing - 45152 North Channel - 45154 Ajax - 45159 Sault Ste. Marie Airport Killarney Greater Sudbury Airport North Bay Airport Gore Bay-Manitoulin Airport Great Duck Island Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Cove Island Goderich Sarnia Chris Hadfield Airport Tobermory Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal Vineland Station Welland-Pelham Windsor Airport Port Colborne Erieau Point Pelee Burlington Lift Bridge Cobourg Hamilton Munro Int'l Airport Oshawa Executive Airport Point Petre Toronto City Centre Airport CFB Trenton Peterborough Municipal Airport
Legend:
buoy Buoy
land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Strong wind warning in effect

Cornwall to Montréal

Issued 5:01 PM EDT 24 July 2024

'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.

Watches (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 5:00 PM EDT 24 July 2024 Conditions will be favourable for the development of squalls with wind gusts up to 40 knots, frequent lightning and hail.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

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 24 July 2024 Tonight and Thursday At 3:00 p.m. EDT today ridge located from James Bay to the Gulf
of St. Lawrence.
By 8:00 a.m. EDT Thursday weakening ridge located from Havre
Saint-Pierre to Newfoundland.

At 3:00 p.m. EDT today low located over eastern Ontario.
By 8:00 p.m. EDT Thursday low located near Anticosti Island.

Great Lakes - Lake Erie and Lake Ontario Area

Another Region

Features

New Predicting and Alerting Coastal Flooding Program

Find out about coastal flooding coverage, forecasts and warnings in your region

Date modified: