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Western Lake Ontario


Marine Forecast

Issued 03:00 AM EDT 21 September 2021

Today Tonight and Wednesday.

Strong wind warning in effect.

Wind south 20 knots diminishing to south 15 this morning and to south 10 early this evening. Wind increasing to south 15 overnight then backing to southeast 15 near noon Wednesday. Wind diminishing to variable 10 Wednesday evening.

Showers beginning near noon with a risk of thunderstorms late this afternoon and this evening changing to rain Wednesday morning.


Issued 03:00 AM EDT 21 September 2021
Today Tonight and Wednesday. Waves one half to one metre.

Extended Forecast

Issued 03:00 AM EDT 21 September 2021
Thursday Wind variable 15 knots increasing to southeast 20 in the morning.
Friday Wind southwest 20 knots.
Saturday Wind southwest 15 knots diminishing to light.

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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

Western Lake Ontario

Issued 03:00 AM EDT 21 September 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 21 September 2021 Today Tonight and Wednesday At 3:00 a.m. EDT today trough located on a line northeast-southwest
over eastern Lake Superior.
By 3:00 a.m. EDT Wednesday trough located on a line
northeast-southwest over southern Lake Huron.

At 3:00 a.m. EDT today departing ridge located on a line
northeast-southwest over the Maritimes.

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