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Lake St. Clair


Marine Forecast

Issued 09:37 PM EDT 20 June 2021

Tonight and Monday.

Strong wind warning in effect.

Wind southwest 15 knots with gusts to 45 near thunderstorms. Wind becoming southwest 20 near midnight then veering to west 20 Monday morning. Wind veering to northwest 20 Monday afternoon.

Showers or a few thunderstorms tonight and Monday morning. Risk of thunderstorms late Monday morning.


Issued 06:30 PM EDT 20 June 2021
Tonight and Monday. Waves less than one half metre building to one half to one metre near midnight.

Extended Forecast

Issued 06:30 PM EDT 20 June 2021
Tuesday Wind north 15 knots diminishing to light in the morning.
Wednesday Wind light.
Thursday Wind south 15 knots.

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Weather Conditions

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Map of Great Lakes - Lake Huron marine weather areas N Huron - 45003 W Erie - 45005 S Huron - 45008 Lake Ontario - 45012 Port Stanley - 45132 Prince Edward Point - 45135 Georgian Bay - 45137 Grimsby - 45139 Port Colborne - 45142 South Georgian Bay - 45143 Lake St Clair - 45147 South Lake Huron - 45149 Lake Simcoe - 45151 Lake Nipissing - 45152 North Channel - 45154 Ajax - 45159 Sault Ste. Marie Airport Killarney Greater Sudbury Airport North Bay Airport Gore Bay-Manitoulin Airport Great Duck Island Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Cove Island Goderich Sarnia Chris Hadfield Airport Tobermory Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal Vineland Station Welland-Pelham Windsor Airport Port Colborne Erieau Point Pelee Burlington Lift Bridge Cobourg Hamilton Munro Int'l Airport Oshawa Executive Airport Point Petre Toronto City Centre Airport CFB Trenton Peterborough Municipal Airport
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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 9 May 2021 Forecasts have ended for the season.

Warnings (In effect)

Strong wind warning in effect

Lake St. Clair

Issued 11:57 PM EDT 20 June 2021

'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

Lake St. Clair

Issued 00:38 AM EDT 21 June 2021 Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning, hail and poor to very poor visibility in thunderstorms heavy at times.

Another round of thunderstorms with squalls to 45 knots is possible overnight.

Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous. Vessels without lightning protection should make their way to shore immediately. 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.

Warnings (Ended)

Squall warning ended

Lake St. Clair

Issued 00:39 AM EDT 21 June 2021

Technical Marine Synopsis

Issued 6:30 PM EDT 20 June 2021 Tonight and Monday At 6:30 p.m. EDT tonight weakening ridge located on a line
northeast-southwest over Pennsylvania.

At 6:30 p.m. EDT tonight low 1000 mb located over Wisconsin.
By 6:30 p.m. EDT Monday low 984 mb located over western Quebec.

By 6:30 p.m. EDT Monday ridge located on a line northeast-southwest
over Lower Michigan.

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