Western Lake Ontario


Marine Forecast

Issued 03:00 AM EDT 19 August 2017

Today Tonight and Sunday.

Wind west 15 knots backing to southwest 15 this morning then veering to northwest 15 this afternoon. Wind diminishing to northwest 10 near midnight then backing to southwest 10 Sunday morning. Wind increasing to southwest 15 Sunday evening.

Chance of showers today and early this evening. Risk of thunderstorms late this afternoon and this evening.


Issued 03:00 AM EDT 19 August 2017
Today Tonight and Sunday. Waves one metre subsiding to one half metre or less overnight then building to one Sunday evening.

Extended Forecast

Issued 03:00 AM EDT 19 August 2017
Monday Wind light becoming southwest 15 knots in the afternoon.
Tuesday Wind southwest 15 knots increasing to southwest 20.
Wednesday Wind northwest 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 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 Goderich Sarnia Chris Hadfield Airport Tobermory Harrow AAFC Port Weller St. Catharines Airport Southeast Shoal Vineland Station Welland-Pelham Windsor Airport Burlington Lift Bridge Cobourg Hamilton Munro Int'l Airport Oshawa Municipal Airport Point Petre Toronto City Centre Airport CFB Trenton Peterborough Municipal Airport Killarney Western Islands Cove Island Long Point Port Colborne Erieau Point Pelee
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Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 27 April 2017 Forecasts have ended for the season.

No watches or warnings in effect.


Technical Marine Synopsis

Issued 3:00 AM EDT 19 August 2017 Today Tonight and Sunday At 3:00 a.m. EDT today low 1001 mb located southeast of James Bay.
By 3:00 a.m. EDT Sunday low 999 mb located over northern Quebec.

At 3:00 a.m. EDT today ridge located from Manitoba to Iowa.
By 3:00 a.m. EDT Sunday ridge located from Lake Huron to Kentucky.

At 3:00 a.m. EDT today low 1002 mb located over southwestern
By 3:00 a.m. EDT Sunday low 1002 mb located over northeastern

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