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Home Return to list Ice Accretion Advisory 0011 Issued by the Boston Forecast Office
Action: New Issued At: 2026-02-28 12:23:24 369 WHUS71 KBOX 281823 MWWBOX URGENT - MARINE WEATHER MESSAGE National Weather Service Boston/Norton MA 123 PM EST Sat Feb 28 2026 ANZ250-254>256-011300- /O.NEW.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 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- 123 PM EST Sat Feb 28 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 9 PM SUNDAY TO 1 PM EST MONDAY... * WHAT...North winds 10 to 20 kt with gusts up to 25 kt and seas 4 to 6 feet expected. * WHERE...In Massachusetts coastal waters, Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary, Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm and 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...From 9 PM Sunday to 1 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ231>235-237-251-011300- /O.NEW.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay- Rhode Island Sound-Block Island Sound- Massachusetts Bay and Ipswich Bay- 123 PM EST Sat Feb 28 2026 ...FREEZING SPRAY ADVISORY IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...Moderate accumulation of freezing spray expected. * WHERE...Portions of Massachusetts coastal waters and Rhode Island coastal waters. * WHEN...From 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. && $$ Action: Continued Issued At: 2026-03-01 00:02:45 381 WHUS71 KBOX 010602 MWWBOX URGENT - MARINE WEATHER MESSAGE National Weather Service Boston/Norton MA 102 AM EST Sun Mar 1 2026 ANZ255-256-011915- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ /O.EXA.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ 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- 102 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... ...FREEZING SPRAY ADVISORY IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...For the Small Craft Advisory, north winds 10 to 20 kt and seas 3 to 5 feet expected. For the Freezing Spray Advisory, moderate accumulation of freezing spray 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 Small Craft Advisory, from 9 PM this evening to 1 PM EST Monday. For the Freezing Spray Advisory, from 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ250-254-011915- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 102 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... * WHAT...North winds 10 to 20 kt with gusts up to 25 kt and seas 4 to 6 feet expected. * WHERE...Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary and Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm. * WHEN...From 9 PM this evening to 1 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ231>235-237-251-011915- /O.CON.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay- Rhode Island Sound-Block Island Sound- Massachusetts Bay and Ipswich Bay- 102 AM EST Sun Mar 1 2026 ...FREEZING SPRAY ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...Moderate accumulation of freezing spray expected. * WHERE...Portions of Massachusetts coastal waters and Rhode Island coastal waters. * WHEN...From 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. && $$ Action: Area Extended Issued At: 2026-03-01 00:02:45 381 WHUS71 KBOX 010602 MWWBOX URGENT - MARINE WEATHER MESSAGE National Weather Service Boston/Norton MA 102 AM EST Sun Mar 1 2026 ANZ255-256-011915- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ /O.EXA.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 102 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... ...FREEZING SPRAY ADVISORY IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...For the Small Craft Advisory, north winds 10 to 20 kt and seas 3 to 5 feet expected. For the Freezing Spray Advisory, moderate accumulation of freezing spray expected. * WHERE...In Massachusetts coastal waters, Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket. In Rhode Island coastal waters, Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island. * WHEN...For the Small Craft Advisory, from 9 PM this evening to 1 PM EST Monday. For the Freezing Spray Advisory, from 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ250-254-011915- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 102 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... * WHAT...North winds 10 to 20 kt with gusts up to 25 kt and seas 4 to 6 feet expected. * WHERE...Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary and Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm. * WHEN...From 9 PM this evening to 1 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ231>235-237-251-011915- /O.CON.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay- Rhode Island Sound-Block Island Sound- Massachusetts Bay and Ipswich Bay- 102 AM EST Sun Mar 1 2026 ...FREEZING SPRAY ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...Moderate accumulation of freezing spray expected. * WHERE...Portions of Massachusetts coastal waters and Rhode Island coastal waters. * WHEN...From 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. && $$ Action: Continued Issued At: 2026-03-01 08:42:15 131 WHUS71 KBOX 011441 MWWBOX URGENT - MARINE WEATHER MESSAGE National Weather Service Boston/Norton MA 941 AM EST Sun Mar 1 2026 ANZ255-256-021500- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ /O.CON.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ 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- 941 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... ...FREEZING SPRAY ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...For the Small Craft Advisory, north winds 10 to 20 kt with gusts up to 25 kt and seas 3 to 5 feet expected. For the Freezing Spray Advisory, moderate accumulation of freezing spray 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 Small Craft Advisory, from 9 PM this evening to 1 PM EST Monday. For the Freezing Spray Advisory, from 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ250-254-021500- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 941 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... * WHAT...North winds 15 to 25 kt and seas 4 to 6 feet expected. * WHERE...Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary and Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm. * WHEN...From 9 PM this evening to 1 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ231>235-237-251-021500- /O.CON.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay- Rhode Island Sound-Block Island Sound- Massachusetts Bay and Ipswich Bay- 941 AM EST Sun Mar 1 2026 ...FREEZING SPRAY ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...Moderate accumulation of freezing spray expected. * WHERE...Portions of Massachusetts coastal waters and Rhode Island coastal waters. * WHEN...From 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. && $$ Action: Continued Issued At: 2026-03-01 08:42:15 131 WHUS71 KBOX 011441 MWWBOX URGENT - MARINE WEATHER MESSAGE National Weather Service Boston/Norton MA 941 AM EST Sun Mar 1 2026 ANZ255-256-021500- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ /O.CON.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 941 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... ...FREEZING SPRAY ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...For the Small Craft Advisory, north winds 10 to 20 kt with gusts up to 25 kt and seas 3 to 5 feet expected. For the Freezing Spray Advisory, moderate accumulation of freezing spray expected. * WHERE...In Massachusetts coastal waters, Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket. In Rhode Island coastal waters, Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island. * WHEN...For the Small Craft Advisory, from 9 PM this evening to 1 PM EST Monday. For the Freezing Spray Advisory, from 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ250-254-021500- /O.CON.KBOX.SC.Y.0026.260302T0200Z-260302T1800Z/ Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 941 AM EST Sun Mar 1 2026 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 1 PM EST MONDAY... * WHAT...North winds 15 to 25 kt and seas 4 to 6 feet expected. * WHERE...Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary and Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm. * WHEN...From 9 PM this evening to 1 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. && $$ ANZ231>235-237-251-021500- /O.CON.KBOX.UP.Y.0011.260302T0600Z-260302T1500Z/ Cape Cod Bay-Nantucket Sound-Vineyard Sound-Buzzards Bay- Rhode Island Sound-Block Island Sound- Massachusetts Bay and Ipswich Bay- 941 AM EST Sun Mar 1 2026 ...FREEZING SPRAY ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM EST MONDAY... * WHAT...Moderate accumulation of freezing spray expected. * WHERE...Portions of Massachusetts coastal waters and Rhode Island coastal waters. * WHEN...From 1 AM to 10 AM EST Monday. * IMPACTS...Operating a vessel in freezing spray is hazardous. Freezing spray may render mechanical and electronic components inoperative. Ice accretion on decks and superstructures may result in some loss of stability. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should prepare for ice accumulation on their vessel and consider altering plans to avoid or mitigate these hazardous conditions. During freezing spray conditions, the U.S. Coast Guard advises mariners to check and ensure all life-saving devices remain free of ice. && $$ | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||