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Severe weather warning for US waters: Storm Watch, Nantucket Sound
Official warning from NWS Boston/Norton MA for Nantucket Sound; Vineyard Sound; Buzzards Bay; Rhode Island Sound; Block Island Sound, Coastal Waters extending out to 25 NM South of Marthas Vineyard and …. Valid from 25 Sep 2026, 06:00 to 23 Sep 2026, 19:30 UTC.
Severe NAMMERT Assekuradeur GmbH
This alert reproduces an official warning as it stood when we published it and is not updated afterwards. The issuing service is authoritative. For what applies now, see the warning map.
- Area
- Nantucket Sound; Vineyard Sound; Buzzards Bay; Rhode Island Sound; Block 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, Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM; Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM, Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM, Cape Cod Bay, Ocean Waters from Provincetown to Nantucket from 20 to 60 NM, Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary; Massachusetts Bay and Ipswich Bay, Ocean Waters from the Merrimack River to Plymouth from 40 to 60 NM
- Warning
- Storm Watch
- Level
- Severe
- Valid from
- 25 Sep 2026, 06:00 UTC
- Valid until
- 23 Sep 2026, 19:30 UTC
- Region
- US waters
- Issued by
- NWS Boston/Norton MA
What matters now
If your boat lies somewhere it can get serious, you act on the plan you made earlier, not on this page. If you have no plan, today is the day to make one.
Doubled lines, chafe protection, fenders, canvas off: half an hour of work that often decides everything. Once it starts there is no time left for it.
Photograph the boat, the lines and the surroundings before anything happens. After a storm that is the only evidence of how it looked before.
Read what your own contract says about storms and about the hurricane season. Many contracts carry their own rules for it.
When it comes to it, the instruction of the local authority and the marina applies, not what a website says.