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Western Lake Ontario


Marine Forecast

Issued 10:30 AM EDT 24 July 2024

Today Tonight and Thursday.

Wind southwest 15 knots with gusts to 50 near thunderstorms. Wind becoming west 15 this evening with gusts to 50 near thunderstorms this evening. Wind diminishing to west 10 early Thursday morning then increasing to northwest 15 Thursday afternoon.

Scattered showers ending near midnight with a risk of thunderstorms.


Issued 10:30 AM EDT 24 July 2024
Today Tonight and Thursday. Waves 0.5 metres or less building to 0.5 to 1 near noon then subsiding to 0.5 or less Thursday morning. Waves building to 0.5 to 1 Thursday evening.

Extended Forecast

Issued 03:00 AM 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 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 12:00 PM EDT 24 July 2024 Squalls with wind gusts up to 35 knots and frequent lightning are expected or occurring in the area.

A line of thunderstorms located from Toronto to Grimsby at 11:54 A.M. EDT is moving east at 30 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 10:30 AM EDT 24 July 2024 Today Tonight and Thursday At 10:30 a.m. EDT today low 1013 mb located over Georgian Bay.
By 10:30 a.m. EDT Thursday low 1009 mb located over southern Quebec.

At 10:30 a.m. EDT today ridge located on a line east-west over
James Bay.
By 10:30 a.m. EDT Thursday ridge located on a line north-south
over northern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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