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Prescott to Cornwall

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 29 April 2025

Today Tonight and Wednesday.

Wind south 15 knots veering to southwest 20 near noon then to northwest 15 near midnight. Wind diminishing to northwest 10 early Wednesday morning then becoming light near noon Wednesday.

Showers this afternoon and this evening with a risk of thunderstorms.

Extended Forecast

Issued 03:00 AM EDT 29 April 2025
Thursday Wind light.
Friday Wind light increasing to southwest 20 knots.
Saturday Wind light.

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

There is no ice forecast issued for this area.

Warnings

Watches (In effect)

Squall watch in effect

Prescott to Cornwall

Issued 5:49 PM EDT 29 April 2025 Conditions are favourable for the development of squalls with wind gusts up to 50 knots and hail.

A line of thunderstorms may cross the waters this afternoon into early this evening. The main threat is squalls to 50 knots. Hail is also possible.

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 6:30 PM EDT 29 April 2025 Tonight and Wednesday At 6:30 p.m. EDT tonight low 997 mb located over southern Quebec.
By 6:30 p.m. EDT Wednesday departing low 990 mb located northeast
of Prince Edward Island.

At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over northwestern Ontario.
By 6:30 p.m. EDT Wednesday ridge located on a line
northeast-southwest over Lake Huron.

By 6:30 p.m. EDT Wednesday trough located on a line
northeast-southwest over the Ontario - Manitoba border.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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