WHUS71 KBOX 201711

MWWBOX



URGENT - MARINE WEATHER MESSAGE

National Weather Service Boston/Norton MA

111 PM EDT Fri Mar 20 2026



ANZ232>235-237-210900-

/O.CON.KBOX.SC.Y.0033.260320T1800Z-260321T0900Z/

Nantucket Sound-Vineyard Sound-Buzzards Bay-Rhode Island Sound-

Block Island Sound-

111 PM EDT Fri Mar 20 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM EDT

SATURDAY...



* WHAT...South winds 15 to 20 kt with gusts up to 30 kt and seas 

  3 to 5 feet expected.



* WHERE...In Massachusetts coastal waters, Nantucket Sound, 

  Vineyard Sound and Buzzards Bay. In Rhode Island coastal 

  waters, Rhode Island Sound and Block Island Sound.



* WHEN...Until 5 AM EDT Saturday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



ANZ250-254>256-210900-

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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-

111 PM EDT Fri Mar 20 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT

SATURDAY...



* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt and 

  seas 4 to 7 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...Until 8 PM EDT Saturday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



ANZ231-251-210900-

/O.CON.KBOX.SC.Y.0033.260320T1800Z-260321T0900Z/

Cape Cod Bay-Massachusetts Bay and Ipswich Bay-

111 PM EDT Fri Mar 20 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 5 AM EDT

SATURDAY...



* WHAT...South winds 15 to 20 kt with gusts up to 30 kt and seas 

  2 to 4 feet expected.



* WHERE...Cape Cod Bay and Massachusetts Bay and Ipswich Bay.



* WHEN...Until 5 AM EDT Saturday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



ANZ236-210600-

/O.CON.KBOX.SC.Y.0033.260320T1800Z-260321T0600Z/

Narragansett Bay-

111 PM EDT Fri Mar 20 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 AM EDT

SATURDAY...



* WHAT...South winds 15 to 20 kt with gusts up to 30 kt and 

  waves around 3 feet expected.



* WHERE...Narragansett Bay.



* WHEN...Until 2 AM EDT Saturday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$



ANZ230-210600-

/O.CON.KBOX.SC.Y.0033.260320T1800Z-260321T0600Z/

Boston Harbor-

111 PM EDT Fri Mar 20 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 AM EDT

SATURDAY...



* WHAT...South winds 10 to 20 kt with gusts up to 30 kt and 

  waves around 2 feet expected.



* WHERE...Boston Harbor.



* WHEN...Until 2 AM EDT Saturday.



* IMPACTS...Conditions will be hazardous to small craft.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Inexperienced mariners, especially those operating smaller

vessels, should avoid navigating in hazardous conditions.



&&



$$