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Northern Lake Huron

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 21 April 2026

Tonight and Wednesday.

Wind south 15 knots diminishing to northeast 10 this evening then backing to north 10 late overnight. Wind becoming light Wednesday morning.

Waves

Issued 06:30 PM EDT 21 April 2026
Tonight and Wednesday. Waves 0.5 to 1 metre subsiding to 0.5 or less near midnight.

Extended Forecast

Issued 06:30 PM EDT 21 April 2026
Thursday Wind light becoming east 15 knots in the morning.
Friday Wind east 20 knots.
Saturday Wind east 15 knots diminishing to light.

Ice Forecast*

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday Open water except 1 tenth thick lake ice in strips and patches near the Straits of Mackinac and near North Channel.

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

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

Ice Forecasts

Northern Lake Huron

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday

Ice Coverage

Open water except 1 tenth thick lake ice in strips and patches near
the Straits of Mackinac and near North Channel.

Ice Forecasts

Northern Lake Michigan

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday

Ice Coverage

Open water except 5 tenths thick lake ice in Little Traverse Bay.

Ice Forecasts

Southern Lake Michigan

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday

Ice Coverage

Ice free.

Ice Forecasts

Green Bay

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday

Ice Coverage

Open water except 9 tenths thick lake ice in Bays de Noc.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 21 April 2026 Tonight and Wednesday At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over the Eastern Seaboard.
By 6:30 p.m. EDT Wednesday ridge located on a line north-south
over Nova Scotia.

By 6:30 p.m. EDT Wednesday low 988 mb located over eastern Montana.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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