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Southern Lake Huron

Forecast

Marine Forecast

Issued 06:30 PM EDT 12 July 2025

Tonight and Sunday.

Strong wind warning in effect.

Wind southwest 20 knots diminishing to southwest 15 this evening and to west 10 late overnight. Wind backing to southwest 10 near noon Sunday.

Scattered showers ending Sunday morning with a risk of thunderstorms. Fog patches.

Waves

Issued 06:30 PM EDT 12 July 2025
Tonight and Sunday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 near midnight and to 0.5 or less early Sunday morning.

Extended Forecast

Issued 06:30 PM EDT 12 July 2025
Monday Wind light becoming southwest 15 knots in the morning then diminishing to light late in the day.
Tuesday Wind light.
Wednesday Wind southwest 15 knots.

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Weather Conditions

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

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

Ice Forecasts

Lake Huron

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

Ice Forecasts

Lake Michigan

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

Warnings (In effect)

Strong wind warning in effect

Southern Lake Huron

Issued 6:30 PM EDT 12 July 2025

'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.

Watches (In effect)

Squall watch in effect

Southern Lake Huron

Issued 6:52 PM EDT 12 July 2025 Conditions are favourable for the development of squalls with wind gusts up to 35 knots and frequent lightning.

Thunderstorms this evening may produce strong wind gusts up to 35 knots.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

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 6:30 PM EDT 12 July 2025 Tonight and Sunday At 6:30 p.m. EDT tonight trough located on a line
northeast-southwest over Georgian Bay.
By 6:30 p.m. EDT Sunday trough located on a line northeast-southwest
over the St. Lawrence River.

At 6:30 p.m. EDT tonight low 1002 mb located over northern Ontario.
By 6:30 p.m. EDT Sunday low 988 mb located over southern Hudson Bay.

At 6:30 p.m. EDT tonight ridge located on a line north-south over
eastern Nebraska.
By 6:30 p.m. EDT Sunday ridge located on a line north-south over
Indiana.

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