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Northern Lake Huron

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 12 July 2025

Today Tonight and Sunday.

Strong wind warning in effect.

Wind south 15 knots increasing to south 20 this afternoon then diminishing to southwest 15 this evening. Wind diminishing to west 10 late overnight then backing to southwest 10 near noon Sunday. Wind backing to south 10 Sunday evening.

Showers ending Sunday morning with a risk of thunderstorms. Fog patches.

Waves

Issued 10:30 AM EDT 12 July 2025
Today Tonight and Sunday. Waves 0.5 to 1 metre building to 1 to 1.5 early this evening then subsiding to 0.5 to 1 near midnight. Waves subsiding to 0.5 or less early Sunday morning.

Extended Forecast

Issued 03:00 AM EDT 12 July 2025
Monday Wind light becoming southwest 15 knots in the afternoon then diminishing to light late in the day.
Tuesday Wind light.
Wednesday Wind light becoming northeast 15 knots late in the day.

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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

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

Northern Lake Huron

Issued 10:30 AM 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

Northern Lake Huron

Issued 4:31 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 afternoon and 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 10:30 AM EDT 12 July 2025 Today Tonight and Sunday At 10:30 a.m. EDT today trough located on a line north-south over
Lake Superior.
By 10:30 a.m. EDT Sunday trough located on a line north-south over
eastern Ontario.

At 10:30 a.m. EDT today ridge located on a line north-south over
South Dakota.
By 10:30 a.m. EDT Sunday ridge located on a line north-south
over Illinois.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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