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Eastern Lake Ontario


Marine Forecast

Issued 10:30 AM EDT 29 July 2021

Today Tonight and Friday.

Strong wind warning in effect.

Wind south 10 knots increasing to northwest 15 this evening then veering to north 15 late overnight. Wind increasing to north 20 early Friday morning then diminishing to northwest 15 near noon Friday.

Scattered showers ending Friday morning. Risk of thunderstorms today and early this evening.


Issued 10:30 AM EDT 29 July 2021
Today Tonight and Friday. Waves one half metre or less building to one half to one metre this evening.

Extended Forecast

Issued 03:00 AM EDT 29 July 2021
Saturday Wind west 15 knots.
Sunday Wind southwest 15 knots increasing to north 20.
Monday Wind north 15 knots becoming southwest 15.

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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 10:30 AM EDT 29 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 10:30 AM EDT 29 July 2021 Today Tonight and Friday At 10:30 a.m. EDT today cold front located on a line
northeast-southwest over northern Lake Huron.
By 10:30 a.m. EDT Friday departing cold front located from Maine
to Virginia.

At 10:30 a.m. EDT today ridge from 1024 mb high located from North
Dakota to Lake Winnipeg.
By 10:30 a.m. EDT Friday ridge from 1023 mb high located from
Wisconsin to James Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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