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Western Lake Ontario


Marine Forecast

Issued 08:07 AM EDT 16 July 2024

Today Tonight and Wednesday.

Strong wind warning in effect.

Wind southwest 15 knots with gusts to 40 near thunderstorms. Wind becoming southwest 20 this morning with gusts to 40 near thunderstorms late this morning. Wind diminishing to southwest 15 this afternoon then veering to west 15 early this evening. Wind backing to southwest 10 to 15 near noon Wednesday then veering to northwest 15 Wednesday evening.

Scattered showers ending this evening with a risk of thunderstorms. Scattered showers Wednesday evening.


Issued 03:00 AM EDT 16 July 2024
Today Tonight and Wednesday. Waves 0.5 metres or less building to 1 this morning then subsiding to 0.5 Wednesday evening.

Extended Forecast

Issued 03:00 AM EDT 16 July 2024
Thursday Wind northwest 15 knots diminishing to light late in the day.
Friday Wind light.
Saturday Wind light becoming west 10 to 15 knots.

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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.

Warnings (In effect)

Squall warning in effect

Western Lake Ontario

Issued 08:24 AM EDT 16 July 2024 Squalls with wind gusts up to 40 knots and frequent lightning are expected or occurring in the area.

A line of thunderstorms near the west end of Lake Ontario is expected to track east this morning. This line is moving east at 40 knots.

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.

Strong wind warning in effect

Western Lake Ontario

Issued 08:07 AM EDT 16 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.


Technical Marine Synopsis

Issued 3:00 AM EDT 16 July 2024 Today Tonight and Wednesday At 3:00 a.m. EDT today trough located on a line northeast-southwest
over northern Lake Huron.
By 3:00 a.m. EDT Wednesday trough located on a line
northeast-southwest over the St. Lawrence River.

Great Lakes - Lake Huron Area

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