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Eastern Lake Ontario


Marine Forecast

Issued 03:00 AM EDT 30 July 2021

Today Tonight and Saturday.

Strong wind warning in effect.

Wind northwest 15 knots increasing to north 20 early this morning then diminishing to northwest 15 near noon. Wind increasing to west 15 to 20 Saturday morning then becoming southwest 15 Saturday evening.

Scattered showers ending early this morning. Scattered showers Saturday evening with a risk of thunderstorms.


Issued 03:00 AM EDT 30 July 2021
Today Tonight and Saturday. Waves one half to one metre building to one to one and one half metres Saturday morning.

Extended Forecast

Issued 03:00 AM EDT 30 July 2021
Sunday Wind light becoming north 15 knots in the afternoon.
Monday Wind northwest 15 knots backing to southwest 15.
Tuesday Wind light becoming southwest 15 knots.

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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 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 30 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 30 July 2021 Today Tonight and Saturday At 3:00 a.m. EDT today cold front located on a line
northeast-southwest over southern Ontario.
By 3:00 a.m. EDT Saturday departing cold front located on a line
northeast-southwest over Nova Scotia.

At 3:00 a.m. EDT today ridge from 1022 mb high located from
Minnesota to Hudson Bay.
By 3:00 a.m. EDT Saturday ridge from 1021 mb high located from
Illinois to Ottawa.

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