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National Weather Service proposes adding swell height and direction to marine forecasts


Dan Foster

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The National Weather Service is considering adding a new Wave Detail line to their marine forecasts, which will indicate the primary and secondary swell height, period, and direction:

Old:

TONIGHT...NE winds around 10 kt. Gusts up to 20 kt this evening.
Seas 3 to 4 ft.

New:

TONIGHT...NE winds around 10 kt. Gusts up to 20 kt this evening.
Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and E 2 ft at
11 seconds.

 

They've got a feedback form if anyone wants to chime in. Seems like a useful addition to the paddling forecast!

Experimental Coastal Waters Forecast Wave Component Update (weather.gov)

Proposed Coastal Waters Forecast - NWS Boston/Norton, MA (weather.gov)

 

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