Johnstone Strait Marine Forecast, Warnings and Alerts

Canada

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Johnstone Strait

Marine Forecast

Issued 10:30 AM PDT 15 May 2026

Today Tonight and Saturday.

Strong wind warning in effect.

Wind southeast 5 to 15 knots becoming light late this afternoon then increasing to northwest 10 to 20 this evening. Wind becoming northwest 15 to 25 Saturday afternoon.

Showers ending overnight. Risk of thunderstorms this afternoon and this evening. Showers Saturday. Fog patches forming overnight and dissipating Saturday morning.

Winds

Issued 10:30 AM PDT 15 May 2026

Today Tonight and Saturday. Strong wind warning in effect. Wind southeast 5 to 15 knots becoming light late this afternoon then increasing to northwest 10 to 20 this evening. Wind becoming northwest 15 to 25 Saturday afternoon.

Weather & Visibility

Issued 10:30 AM PDT 15 May 2026

Today Tonight and Saturday. Showers ending overnight. Risk of thunderstorms this afternoon and this evening. Showers Saturday. Fog patches forming overnight and dissipating Saturday morning.

There is no ice forecast issued for this area.

Warnings (In effect)

Strong wind warning in effect

Johnstone Strait

Issued 10:30 AM PDT 15 May 2026

'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 PDT 15 May 2026 Today Tonight and Saturday At 10:30 a.m. PDT today trough located over Explorer.
By 4:00 p.m. PDT today trough located over the South Coast.

At 9:30 p.m. PDT tonight ridge located west of the offshore waters.
By 10:30 a.m. PDT Saturday ridge located on a line north-south
over Bowie.

At 9:30 p.m. PDT Saturday approaching frontal system located west
of Bowie.

Marine Weather Statement

Issued 10:20 AM PDT 15 May 2026 A trough is moving through Explorer this afternoon. This will
generate northwesterly gale force winds in southwestern sections of
Explorer. Winds will ease overnight as the trough leaves Explorer.

In addition, this trough will create conditions favourable for the
development of waterspouts across the Strait of Georgia, Howe Sound
and west coast Vancouver Island from this afternoon to Saturday
morning.

A transient ridge of high pressure builds over the offshore waters on
Saturday. As the ridge moves closer to the coast, gale force
westerlies will develop through Juan de Fuca Strait Saturday
afternoon. These winds will ease to strong westerlies Saturday
overnight.

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