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Western Lake Ontario


Marine Forecast

Issued 01:20 PM EDT 22 September 2021

Today Tonight and Thursday.

Strong wind warning in effect.

Wind southeast 20 knots except north 20 near the west end. Wind becoming east 20 near midnight then diminishing to southwest 10 Thursday morning. Wind increasing to southwest 15 Thursday afternoon and to southwest 20 Thursday evening.

Showers. Risk of thunderstorms late this afternoon and tonight.


Issued 10:30 AM EDT 22 September 2021
Today Tonight and Thursday. Waves 0.5 to 1 metre.

Extended Forecast

Issued 03:00 AM EDT 22 September 2021
Friday Wind southwest 20 knots.
Saturday Wind southwest 15 knots veering to west 20 late in the day.
Sunday Wind west 20 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

Western Lake Ontario

Issued 2:35 PM EDT 22 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 10:30 AM EDT 22 September 2021 Today Tonight and Thursday At 10:30 a.m. EDT today deepening low 1009 mb located over
southern Ohio.
By 10:30 a.m. EDT Thursday low 1001 mb located over northwestern

At 10:30 a.m. EDT today quasi-stationary trough from low located
on a line northeast-southwest over southern Ontario.

At 10:30 a.m. EDT today quasi-stationary ridge located on a line
northeast-southwest over Lake Superior.

Great Lakes - Lake Huron Area

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