L'Isle-aux-Coudres to Tadoussac, Canada Marine Forecast, Warnings and Alerts

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L'Isle-aux-Coudres to Tadoussac

Marine Forecast

Issued 03:00 AM EST 18 December 2025

Today Tonight and Friday.

Storm warning in effect.

Wind northwest 10 to 15 knots increasing to southwest 25 early this morning then diminishing to southwest 15 this evening. Wind diminishing to light overnight then increasing to easterly 15 Friday morning. Wind increasing to southeasterly 20 to 30 Friday afternoon except south 50 near the south shore. Wind becoming southwest 40 to 50 Friday evening.

Rain Friday changing to snow. Visibility 1 mile or less in snow.

Temperatures minus 5 rising to plus 9 Friday afternoon then falling to plus 3 Friday evening.

Winds

Issued 03:00 AM EST 18 December 2025

Today Tonight and Friday. Storm warning in effect. Wind northwest 10 to 15 knots increasing to southwest 25 early this morning then diminishing to southwest 15 this evening. Wind diminishing to light overnight then increasing to easterly 15 Friday morning. Wind increasing to southeasterly 20 to 30 Friday afternoon except south 50 near the south shore. Wind becoming southwest 40 to 50 Friday evening.

Waves

Issued 03:00 AM EST 18 December 2025

Today Tonight and Friday. Over open water seas 1 metre or less building to 1 to 2 Friday evening.

Weather & Visibility

Issued 03:00 AM EST 18 December 2025

Today Tonight and Friday. Rain Friday changing to snow. Visibility 1 mile or less in snow.

Air temperature

Issued 03:00 AM EST 18 December 2025

Today Tonight and Friday. Temperatures minus 5 rising to plus 9 Friday afternoon then falling to plus 3 Friday evening.

There is no ice forecast issued for this area.

Warnings (In effect)

Storm warning in effect

L'Isle-aux-Coudres to Tadoussac

Issued 03:00 AM EST 18 December 2025

'Storm' force winds of 48 to 63 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 3:00 AM EST 18 December 2025 Today Tonight and Friday At 3:00 a.m. EST today ridge located on a line north-south over
Trois-Rivières.
By 7:00 p.m. EST tonight departing ridge located on a line
northwest-southeast over the Gulf of St. Lawrence.

At 7:00 p.m. EST tonight low 989 mb located over Lake Superior.
By 7:00 p.m. EST Friday low 972 mb located north of Lake Saint-Jean.

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