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Western Lake Ontario


Marine Forecast

Issued 06:30 PM EDT 20 June 2024

Tonight and Friday.

Wind light tonight and Friday.

Scattered showers ending overnight with a risk of thunderstorms. Scattered showers Friday afternoon and evening with a risk of thunderstorms.


Issued 06:30 PM EDT 20 June 2024
Tonight and Friday. Waves less than 0.5 metres.

Extended Forecast

Issued 06:30 PM 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 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
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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.

Warnings (In effect)

Squall warning in effect

Western Lake Ontario

Issued 6:30 PM EDT 20 June 2024 Squalls with wind gusts up to 40 knots, frequent lightning and poor to very poor visibility in thunderstorms heavy at times are expected or occurring in the area.

This thunderstorm is located near the western shoreline of Lake Ontario moving east at 15 knots.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately.

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 6:30 PM EDT 20 June 2024 Tonight and Friday At 6:30 p.m. EDT tonight ridge located on a line east-west over
northern Lake Superior.
By 6:30 p.m. EDT Friday ridge located from Lake Winnipeg to Lake
Huron then to Kentucky.

At 6:30 p.m. EDT tonight cold front located from Cornwall to
By 6:30 p.m. EDT Friday cold front located on a line east-west
over Lake St. Clair.

Great Lakes - Lake Erie and Lake Ontario Area

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