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Severe · Special Marine WarningThis alert has expired. It is kept for reference.

Special Marine Warning issued September 4 at 3:06AM EDT until September 4

Affecting Rhode Island Sound; Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket; Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island

In effect until: Sep 4, 2026, 8:00 AM

Rhode Island Sound; Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket; Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island

Likely impact; effects through 8:00 AM.

Move to safe harbor until hazardous weather passes. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.

Read the original bulletin (official text)
SMWBOX

The National Weather Service in Boston/Norton has issued a

* Special Marine Warning for...
Coastal Waters extending out to 25 NM South of Marthas Vineyard and
Nantucket...
Coastal Waters from Montauk NY to Marthas Vineyard extending out to
20 NM South of Block Island...
Rhode Island Sound...

* Until 400 AM EDT.

* At 305 AM EDT, a strong thunderstorm was located over The Coastal
Waters Between Block Island And Marthas Vineyard, moving east at 20
knots.

HAZARD...Wind gusts 34 knots or greater.

SOURCE...Radar.

IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.

* Locations impacted include...
Rhode Island Sound and The Coastal Waters Between Block Island And
Marthas Vineyard.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™