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Southern Georgian Bay


Marine Forecast

Issued 06:30 PM EDT 20 October 2021

Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 10 knots increasing to southwest 15 early Thursday morning and to southwest 20 late Thursday morning. Wind becoming north 20 Thursday afternoon.

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


Issued 06:30 PM EDT 20 October 2021
Tonight and Thursday. Waves 0.5 metres or less building to 0.5 to 1 Thursday morning and to 1.5 Thursday evening.

Extended Forecast

Issued 06:30 PM EDT 20 October 2021
Friday Wind north 15 knots diminishing to light in the afternoon.
Saturday Wind light.
Sunday Wind west 15 knots becoming northeast 15 late in the day.

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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

Southern Georgian Bay

Issued 6:30 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 6:30 PM EDT 20 October 2021 Tonight and Thursday At 6:30 p.m. EDT tonight departing ridge located on a line
northeast-southwest over Lake Erie.

At 6:30 p.m. EDT tonight departing trough located on a line
east-west over Georgian Bay.

At 6:30 p.m. EDT tonight low 1007 mb located over southwestern
By 6:30 p.m. EDT Thursday low 1004 mb located over southern Quebec.

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