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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 29 April 2025

Today Tonight and Wednesday.

Wind southwest 25 knots veering to northwest 20 this evening then diminishing to northwest 10 late overnight. Wind becoming light Wednesday morning.

Scattered showers ending this evening with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 29 April 2025
Today Tonight and Wednesday. Waves 1.5 metres subsiding to 1 near midnight and to 0.5 or less early Wednesday morning.

Extended Forecast

Issued 03:00 AM EDT 29 April 2025
Thursday Wind light increasing to east 20 knots in the afternoon.
Friday Wind southwest 25 knots diminishing to west 15 late in the day.
Saturday Wind light.

Ice Forecast*

Issued 12:00 PM EDT 29 April 2025 Today Tonight and Wednesday Ice free.

*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 29 April 2025 Today Tonight and Wednesday

Ice Coverage

Ice free.

Warnings

Watches (In effect)

Squall watch in effect

Western Lake Ontario

Issued 1:47 PM EDT 29 April 2025 Conditions are favourable for the development of squalls with wind gusts up to 50 knots and hail.

A line of thunderstorms may cross the waters this afternoon into early this evening. The main threat is squalls to 50 knots. Hail is also possible.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 29 April 2025 Today Tonight and Wednesday At 10:30 a.m. EDT today low 997 mb located over northeastern
Ontario.
By 10:30 a.m. EDT Wednesday low 990 mb located over eastern Quebec.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over the Ontario - Manitoba border.
By 10:30 a.m. EDT Wednesday ridge located on a line
northeast-southwest over Whitefish Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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