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Southern Georgian Bay


Marine Forecast

Issued 10:30 AM EDT 20 October 2021

Today Tonight and Thursday.

Strong wind warning in effect.

Wind west 15 knots diminishing to southwest 10 early this evening then increasing to south 15 late overnight. Wind increasing to southwest 20 Thursday morning then becoming north 20 Thursday afternoon.

Showers tonight and Thursday. Risk of waterspouts Thursday late in the day.


Issued 10:30 AM EDT 20 October 2021
Today Tonight and Thursday. Waves 0.5 to 1 metre subsiding to 0.5 or less this evening then building to 0.5 to 1 early Thursday morning. Waves building to 1.5 Thursday evening.

Extended Forecast

Issued 03:35 AM EDT 20 October 2021
Friday Wind north 15 knots diminishing to light in the afternoon.
Saturday Wind light.
Sunday Wind west 15 knots diminishing to light late in the day.

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Weather Conditions

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Map of Great Lakes - Lake Erie and Lake Ontario 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

Southern Georgian Bay

Issued 1:13 PM EDT 20 October 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.


Technical Marine Synopsis

Issued 10:30 AM EDT 20 October 2021 Today Tonight and Thursday At 10:30 a.m. EDT today departing high 1027 mb located over
eastern Tennessee.

At 10:30 a.m. EDT today departing trough located on a line east-west
over North Channel.

By 10:30 a.m. EDT Thursday approaching low 1005 mb located over
central Lake Huron.

Great Lakes - Lake Erie and Lake Ontario Area

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