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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 29 April 2025

Today Tonight and Wednesday.

Gale warning in effect.

Wind southwest 25 knots veering to west 25 this afternoon then increasing to west 35 early this evening. Wind diminishing to northwest 30 late this evening and to north 15 near midnight. Wind diminishing to variable 10 early Wednesday morning.

Scattered showers and fog patches ending this evening with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 29 April 2025
Today Tonight and Wednesday. Waves 1 to 1.5 metres building to 2 early this evening then subsiding to 1 late overnight. Waves subsiding to 0.5 or less Wednesday morning.

Extended Forecast

Issued 03:00 AM EDT 29 April 2025
Thursday Wind light increasing to east 20 knots late in the day.
Friday Wind east 20 knots becoming west 20.
Saturday Wind light.

Ice Forecast*

Issued 12:00 PM EDT 29 April 2025 Today Tonight and Wednesday Ice free.

*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 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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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 29 April 2025 Today Tonight and Wednesday

Ice Coverage

Ice free.

Warnings

Warnings (In effect)

Gale warning in effect

Georgian Bay

Issued 10:30 AM EDT 29 April 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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 Georgian Bay

Issued 3:07 PM EDT 29 April 2025 A line of strong to severe thunderstorms is expected push over Lake Huron and Georgian Bay this afternoon along and ahead of an advancing cold front. These storms may produce wind gusts up to 50 knots, large hail and frequent lightning.

Large hail can damage vessels and cause injury. 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.

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 29 April 2025 Today Tonight and Wednesday At 10:30 a.m. EDT today low 997 mb located over northeastern
Ontario.
By 10:30 a.m. EDT Wednesday low 990 mb located over eastern Quebec.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over the Ontario - Manitoba border.
By 10:30 a.m. EDT Wednesday ridge located on a line
northeast-southwest over Whitefish Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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