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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 13 July 2025

Today Tonight and Monday.

Wind southwest 15 knots diminishing to south 10 this evening then becoming light near midnight. Wind becoming southwest 10 Monday morning.

Scattered showers ending near midnight with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 13 July 2025
Today Tonight and Monday. Waves 0.5 to 1 metre subsiding to 0.5 or less near midnight.

Extended Forecast

Issued 03:00 AM EDT 13 July 2025
Tuesday Wind light.
Wednesday Wind light.
Thursday Wind light becoming southwest 15 knots.

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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
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land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings

Watches (In effect)

Squall watch in effect

Eastern Lake Ontario

Issued 1:02 PM EDT 13 July 2025 Conditions are favourable for the development of squalls with wind gusts up to 35 knots and frequent lightning.

Thunderstorms with squalls possible this afternoon and evening. Storms will mainly be moving eastward.

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 13 July 2025 Today Tonight and Monday At 10:30 a.m. EDT today trough from 992 mb low located from James
Bay to Lake Erie.
By 10:30 a.m. EDT Monday departing trough from 985 mb low located
from Hudson Bay to the St. Lawrence River.

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

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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