Marine Weather Message
Issued by NWS Boston, MA
Issued by NWS Boston, MA
553 WHUS71 KBOX 211847 MWWBOX URGENT - MARINE WEATHER MESSAGE National Weather Service Boston/Norton MA 247 PM EDT Mon Sep 21 2026 ANZ255-256-221100- /O.CON.KBOX.SC.Y.0087.000000T0000Z-260922T0700Z/ /O.CON.KBOX.GL.A.0017.260922T1800Z-260924T1700Z/ 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- 247 PM EDT Mon Sep 21 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 AM EDT TUESDAY... ...GALE WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... * WHAT...For the Small Craft Advisory, northeast winds 15 to 20 kt with gusts up to 25 kt and seas 3 to 5 feet. For the Gale Watch, northeast winds 20 to 30 kt with gusts up to 40 kt and seas 8 to 13 feet possible. * 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 Small Craft Advisory, until 3 AM EDT Tuesday. For the Gale Watch, from Tuesday afternoon through Thursday afternoon. * IMPACTS...Strong winds can cause hazardous seas which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should consider altering plans to avoid possible hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for severe wind and seas. && $$ ANZ235-237-221100- /O.CON.KBOX.SC.Y.0087.000000T0000Z-260921T2100Z/ /O.CON.KBOX.GL.A.0017.260922T1800Z-260924T1700Z/ Rhode Island Sound-Block Island Sound- 247 PM EDT Mon Sep 21 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... ...GALE WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... * WHAT...For the Small Craft Advisory, northeast winds 15 to 20 kt with gusts up to 25 kt and seas 2 to 4 feet. For the Gale Watch, northeast winds 20 to 30 kt with gusts up to 40 kt and seas 5 to 8 feet possible. * WHERE...Rhode Island Sound and Block Island Sound. * WHEN...For the Small Craft Advisory, until 5 PM EDT this afternoon. For the Gale Watch, from Tuesday afternoon through Thursday afternoon. * IMPACTS...Strong winds can cause hazardous seas which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should consider altering plans to avoid possible hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for severe wind and seas. && $$ ANZ254-220700- /O.CON.KBOX.SC.Y.0087.000000T0000Z-260922T0700Z/ Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM- 247 PM EDT Mon Sep 21 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 AM EDT TUESDAY... * WHAT...Northeast winds 10 to 20 kt and seas 3 to 5 feet. * WHERE...Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM. * WHEN...Until 3 AM EDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ233-234-212100- /O.CON.KBOX.SC.Y.0087.000000T0000Z-260921T2100Z/ Vineyard Sound-Buzzards Bay- 247 PM EDT Mon Sep 21 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... * WHAT...Northeast winds 15 to 20 kt with gusts up to 25 kt and seas around 3 feet. * WHERE...Vineyard Sound and Buzzards Bay. * WHEN...Until 5 PM EDT this afternoon. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ231-232-212100- /O.CON.KBOX.SC.Y.0087.000000T0000Z-260921T2100Z/ Cape Cod Bay-Nantucket Sound- 247 PM EDT Mon Sep 21 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... * WHAT...Northeast winds 15 to 20 kt with gusts up to 25 kt and seas around 3 feet. * WHERE...Cape Cod Bay and Nantucket Sound. * WHEN...Until 5 PM EDT this afternoon. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ282-283-221100- /O.CON.KBOX.GL.A.0017.260922T1800Z-260924T1700Z/ Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM- Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM- 247 PM EDT Mon Sep 21 2026 ...GALE WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH THURSDAY AFTERNOON... * WHAT...Northeast winds 25 to 35 kt with gusts up to 45 kt and seas 10 to 15 feet possible. * WHERE...Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM and Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM. * WHEN...From Tuesday afternoon through Thursday afternoon. * IMPACTS...Strong winds can cause hazardous seas which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should consider altering plans to avoid possible hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for severe wind and seas. && $$