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Western Lake Ontario


Marine Forecast

Issued 10:30 AM EDT 02 June 2023

Today Tonight and Saturday.

Strong wind warning in effect.

Wind light becoming north 10 knots early this evening then increasing to northeast 15 late overnight. Wind increasing to northeast 20 Saturday morning then diminishing to east 15 Saturday afternoon. Wind backing to northeast 15 Saturday evening.

Scattered showers this afternoon and this evening with a risk of thunderstorms.


Issued 10:30 AM EDT 02 June 2023
Today Tonight and Saturday. Waves 0.5 metres or less building to 0.5 to 1 early Saturday morning and to 1 to 1.5 near noon Saturday. Waves subsiding to 0.5 to 1 Saturday evening.

Extended Forecast

Issued 03:00 AM EDT 02 June 2023
Sunday Wind northeast 15 knots diminishing to light late in the day.
Monday Wind light becoming north 15 knots late in the day.
Tuesday Wind north 15 knots.

Ice Forecast*

Issued Forecasts available to mariners upon request.

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


[ Canadian Ice Service ]

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Weather Conditions

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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


Ice Coverage

Forecasts available to mariners upon request.


Warnings (In effect)

Squall warning in effect

Western Lake Ontario

Issued 4:46 PM EDT 02 June 2023 Squalls with wind gusts up to 45 knots, hail of 1 to 2 centimetres and poor to very poor visibility in thunderstorms heavy at times are expected or occurring in the area.

Severe thunderstorms located south of Bowmanville will continue to move south late this afternoon and this evening.

Large hail can damage vessels and cause injury. Proceed with caution as visibility may suddenly be reduced to near zero. 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 11:18 AM EDT 02 June 2023

'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 10:30 AM EDT 2 June 2023 Today Tonight and Saturday At 10:30 a.m. EDT today quasi-stationary high 1038 mb located over
northern Quebec.

At 10:30 a.m. EDT today cold front located on a line east-west
over northern Ontario.
By 10:30 a.m. EDT Saturday cold front located off the East Coast
of the U.S.

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