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Small Craft Advisory — Boston Harbor, AN
Issued
Expires
7:00 PM CDT · Thu, Sep 24 2026
Issuing Office
NWS KBOX

Affected Areas

Boston Harbor, AN

Official Bulletin

* WHAT...For the first Small Craft Advisory, northeast winds
around 20 kt and seas 3 to 5 feet. For the second Small Craft
Advisory, northeast winds 20 to 25 kt with gusts up to 30 kt
and seas 4 to 7 feet expected. For the Gale Warning, northeast
winds 25 to 35 kt with gusts up to 40 kt and seas 7 to 12 feet
expected.

* WHERE...In Massachusetts coastal waters, Coastal Waters
extending out to 25 NM South of Marthas Vineyard and
Nantucket. In Rhode Island coastal waters, Coastal Waters from
Montauk NY to Marthas Vineyard extending out to 20 NM South of
Block Island.

* WHEN...For the first Small Craft Advisory, until 3 AM EDT
early this morning. For the second Small Craft Advisory, from
8 AM this morning to 2 AM EDT Wednesday. For the Gale Warning,
from 2 AM Wednesday to 8 PM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous seas which could
capsize or damage vessels and reduce visibility.

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.