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Marine Thunderstorm Wind · Gulf of Alaska

Marine Thunderstorm Wind September 16, 2009 · Cape Edgecumbe To Cape Fairweather, Gulf of Alaska

58 mph

Estimated gust (50 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Numerous thunderstorms occurred in the waters around Baranof Island on the afternoon of September 16th. Several gusts to 40 knots were observed at Sitka airport from 1401 to 1500 AKST. Buoy 46083 had a gusts to 33 knots around 1500 AKST. Cape Decision had gusts to 42 knots at 1600 AKST. The Biorka radar had continuous strong cell echoes from 1400 to 1800 AKST.

The wider storm

On September 16, an upper level disturbance moved over the Eastern Gulf of Alaska. Cold air aloft over the warm waters of the Gulf caused numerous thunderstorms especially for the waters around Baranof Island. Frequent lightning was observed both visually and from the Canadian lightning detection system that afternoon.

Began near Cape Edgecumbe (57.2089, -137.9883).

Source: NOAA Storm Events Database, event 198243. Narratives are written by the National Weather Service forecast office that issued the report.

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