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Eastern Lake Ontario


Marine Forecast

Issued 03:00 AM EDT 25 July 2021

Today Tonight and Monday.

Strong wind warning in effect.

Wind southwest 20 knots diminishing to southwest 15 this morning then veering to west 15 near midnight. Wind diminishing to west 10 Monday morning then increasing to west 15 Monday afternoon.

Showers ending early this morning with a risk of thunderstorms.


Issued 03:00 AM EDT 25 July 2021
Today Tonight and Monday. Waves one metre subsiding to one half metre near noon Monday then building to one Monday evening.

Extended Forecast

Issued 03:00 AM EDT 25 July 2021
Tuesday Wind light becoming west 15 knots late in the day.
Wednesday Wind west 15 knots diminishing to light.
Thursday 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 9 May 2021 Forecasts have ended for the season.

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 03:00 AM EDT 25 July 2021

'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 25 July 2021 Today Tonight and Monday At 3:00 a.m. EDT today cold front located from Lake Ontario to
Lake Erie then to Iowa.
By 3:00 a.m. EDT Monday cold front located from Maine to Kentucky.

At 3:00 a.m. EDT today ridge located on a line northwest-southeast
over South Dakota.
By 3:00 a.m. EDT Monday ridge located on a line north-south
over Iowa.

Great Lakes - Lake Erie and Lake Ontario Area

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