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Western Lake Ontario


Marine Forecast

Issued 10:30 AM EDT 20 June 2024

Today Tonight and Friday.

Wind light becoming northwest 10 knots near noon then becoming light this evening. Wind light Friday.

Scattered showers tonight. Risk of thunderstorms today and tonight. Risk of thunderstorms Friday late in the day.


Issued 10:30 AM EDT 20 June 2024
Today Tonight and Friday. Waves less than 0.5 metres.

Extended Forecast

Issued 03:00 AM EDT 20 June 2024
Saturday Wind light becoming east 15 knots in the afternoon.
Sunday Wind southeast 15 knots veering to southwest 20.
Monday Wind west 15 knots diminishing to light.

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Map of Great Lakes - Lake Huron 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
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Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 27 April 2024 Forecasts have ended for the season.

Watches (In effect)

Squall watch in effect

Western Lake Ontario

Issued 2:37 PM EDT 20 June 2024 Conditions are favourable for the development of squalls with wind gusts up to 35 knots.

Thunderstorms are expected to develop this afternoon and evening.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.


Technical Marine Synopsis

Issued 10:30 AM EDT 20 June 2024 Today Tonight and Friday At 10:30 a.m. EDT today ridge located on a line east-west over
northern Ontario.
By 10:30 a.m. EDT Friday ridge located from Lake Superior to
New Brunswick.

At 10:30 a.m. EDT today cold front located from Ottawa to Lake
St. Clair.
By 10:30 a.m. EDT Friday cold front located from Rochester to

Great Lakes - Lake Huron Area

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