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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 18 April 2025

Today Tonight and Saturday.

Wind southeast 10 knots increasing to southwest 15 near noon then backing to south 15 this evening. Wind veering to southwest 20 late overnight then increasing to southwest 25 Saturday morning. Wind veering to west 20 Saturday afternoon.

Scattered showers this afternoon tonight and Saturday with a risk of thunderstorms. Fog patches forming near midnight and dissipating Saturday evening.

Waves

Issued 10:30 AM EDT 18 April 2025
Today Tonight and Saturday. Waves 0.5 metres or less building to 0.5 to 1 this afternoon then subsiding to 0.5 or less near midnight. Waves building to 1 to 1.5 early Saturday morning.

Extended Forecast

Issued 03:00 AM EDT 18 April 2025
Sunday Wind northwest 20 knots diminishing to light late in the day.
Monday Wind northeast 15 knots veering to east 20.
Tuesday Wind southwest 25 knots.

Ice Forecast*

Issued 12:00 PM EDT 18 April 2025 Today Tonight and Saturday Open water except 5 tenths thick lake ice near St. Catharines.

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

 

[ Canadian Ice Service ]

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
Legend:
buoy Buoy
land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 18 April 2025 Today Tonight and Saturday

Ice Coverage

Open water except 5 tenths thick lake ice near St. Catharines.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 18 April 2025 Today Tonight and Saturday At 10:30 a.m. EDT today departing ridge located on a line
north-south over southern Quebec.

At 10:30 a.m. EDT today trough located on a line northeast-southwest
over northeastern Ontario.
By 10:30 a.m. EDT Saturday trough located on a line
northeast-southwest over southern Ontario.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over northern Manitoba.
By 10:30 a.m. EDT Saturday ridge located on a line
northeast-southwest over northwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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