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Eastern Lake Ontario


Marine Forecast

Issued 06:30 PM EDT 24 July 2024

Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 15 to 20 knots with gusts to 35 near thunderstorms. Wind becoming west 15 near midnight then increasing to west 20 near noon Thursday. Wind diminishing to northwest 15 Thursday evening.

Scattered showers ending overnight with a risk of thunderstorms.


Issued 06:30 PM EDT 24 July 2024
Tonight and Thursday. Waves 1 metre building to 1 to 1.5 Thursday afternoon then subsiding to 0.5 to 1 Thursday evening.

Extended Forecast

Issued 06:30 PM EDT 24 July 2024
Friday Wind northwest 15 knots diminishing to light in the morning.
Saturday Wind light.
Sunday Wind light.

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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

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

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 6:30 PM EDT 24 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.

Watches (In effect)

Squall watch in effect

Eastern Lake Ontario

Issued 6:20 PM EDT 24 July 2024 Conditions are favourable for the development of squalls with wind gusts up to 35 knots.

Thunderstorms remain possible early this evening.

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.


Technical Marine Synopsis

Issued 6:30 PM EDT 24 July 2024 Tonight and Thursday At 6:30 p.m. EDT tonight low 1013 mb located east of Lake Nipissing.
By 6:30 p.m. EDT Thursday low 1008 mb located over southeastern

At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over Lake Nipigon.
By 6:30 p.m. EDT Thursday ridge located on a line north-south over
northern Ontario.

Great Lakes - Lake Huron Area

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