Great Lakes - Western Lake Ontario Marine Forecast and Alerts

Canada

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Current Conditions

Canada 7 Day High and Low Temperatures Forecast

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Western Lake Ontario

Marine Forecast

Issued 10:30 AM EDT 27 June 2025

Today Tonight and Saturday.

Strong wind warning in effect.

Wind east 20 knots diminishing to east 15 near noon and to south 10 early this evening. Wind increasing to southwest 15 near midnight then diminishing to southwest 10 early Saturday morning. Wind veering to west 10 near noon Saturday.

Scattered showers ending Saturday morning with a risk of thunderstorms. Fog patches forming near midnight and dissipating near noon Saturday.

Winds

Issued 10:30 AM EDT 27 June 2025

Today Tonight and Saturday. Strong wind warning in effect. Wind east 20 knots diminishing to east 15 near noon and to south 10 early this evening. Wind increasing to southwest 15 near midnight then diminishing to southwest 10 early Saturday morning. Wind veering to west 10 near noon Saturday.

Waves

Issued 10:30 AM EDT 27 June 2025

Today Tonight and Saturday. Waves 1 metre subsiding to 0.5 this evening then building to 0.5 to 1 late overnight. Waves subsiding to 0.5 or less Saturday morning.

Weather & Visibility

Issued 10:30 AM EDT 27 June 2025

Today Tonight and Saturday. Scattered showers ending Saturday morning with a risk of thunderstorms. Fog patches forming near midnight and dissipating near noon Saturday.

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.

Warnings (In effect)

Strong wind warning in effect

Western Lake Ontario

Issued 10:30 AM EDT 27 June 2025

'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 27 June 2025 Today Tonight and Saturday At 10:30 a.m. EDT today low 1006 mb located over eastern Lake
Superior.
By 10:30 a.m. EDT Saturday low 1004 mb located over western Quebec.

By 10:30 a.m. EDT Saturday approaching ridge located on a line
north-south over Wisconsin.

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