Sandy Bay Weather Center
Weather Center


X

ANZ230 Boston Harbor

Expires:202604262100;;543033
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ230-262100-
Boston Harbor-
405 AM EDT Sun Apr 26 2026

.TODAY...N winds around 5 kt, becoming E this afternoon. Waves
1 foot or less. 
.TONIGHT...E winds around 5 kt, becoming NE after midnight. Waves
1 foot or less. 
.MON...NE winds 5 to 10 kt. Waves 1 foot or less, then around
2 ft in the afternoon. 
.MON NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. 
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. 
.WED...NE winds 5 to 10 kt. Waves 1 foot or less, except 2 to
4 ft at the outer harbor entrance. 
.WED NIGHT...E winds 5 to 10 kt. Waves 1 foot or less, except
2 to 4 ft at the outer harbor entrance. Showers likely. 
.THU...E winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft
at the outer harbor entrance. Showers.
.THU NIGHT...N winds 15 to 20 kt. Waves around 2 ft. Showers
likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


	
X

ANZ231 Cape Cod Bay

		
Expires:202604262100;;543024
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ231-262100-
Cape Cod Bay-
405 AM EDT Sun Apr 26 2026

.TODAY...NE winds around 5 kt. Seas around 2 ft this morning,
then 1 foot or less. Wave Detail: E 2 ft at 9 seconds and N
1 foot at 4 seconds, becoming N 1 foot at 4 seconds and S 1 foot
at 7 seconds. Scattered sprinkles this morning. 
.TONIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail:
N 1 foot at 2 seconds and SE 1 foot at 8 seconds. 
.MON...NE winds around 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: N 1 foot at 3 seconds and SE
1 foot at 8 seconds. 
.MON NIGHT...NE winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and N
1 foot at 3 seconds. 
.TUE AND TUE NIGHT...NE winds around 10 kt with gusts up to
20 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and N
1 foot at 3 seconds. 
.WED...NE winds around 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft
at 9 seconds and NE 2 ft at 11 seconds. 
.WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. 
.THU...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. 
.THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Showers likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


	        
X

ANZ232 Nantucket Sound

Expires:202604262100;;543028
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ232-262100-
Nantucket Sound-
405 AM EDT Sun Apr 26 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...

.TODAY...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 9 seconds and NW 1 foot at 3 seconds. Scattered
sprinkles. 
.TONIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt after
midnight. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and
E 1 foot at 3 seconds. 
.MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 7 seconds and NE 2 ft at 3 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E
2 ft at 8 seconds. 
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: E 3 ft at 8 seconds and N 2 ft at 5 seconds. 
.TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail:
NE 3 ft at 5 seconds and E 3 ft at 10 seconds. 
.WED...NE winds around 10 kt. Seas 3 to 5 ft. 
.WED NIGHT...E winds around 10 kt. Seas 2 to 4 ft. Showers
likely. 
.THU...E winds around 10 kt. Seas 2 to 4 ft. Showers likely. 
.THU NIGHT...W winds 15 to 20 kt. Seas 3 to 5 ft. Showers likely.
 

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


	                	
X

ANZ233 Vinyard Sound

Expires:202604262100;;543029
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ233-262100-
Vineyard Sound-
405 AM EDT Sun Apr 26 2026

.TODAY...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 foot at 2 seconds and S 1 foot at 6 seconds. A chance of rain
this morning, then scattered sprinkles this afternoon. 
.TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 7 seconds and NE 1 foot at 3 seconds. 
.MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 3 seconds and SE 2 ft at 7 seconds. 
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and SE
2 ft at 8 seconds. 
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at
9 seconds. 
.WED...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 11 seconds and NE 1 foot at 3 seconds. 
.WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. 
.THU...E winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. 
.THU NIGHT...NW winds 15 to 20 kt. Seas 2 to 4 ft. Showers
likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		                	
X

ANZ234 Buzzards Bay

Expires:202604262100;;543030
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ234-262100-
Buzzards Bay-
405 AM EDT Sun Apr 26 2026

.TODAY...NE winds 5 to 10 kt. Seas 1 foot or less, then around
2 ft this afternoon. Wave Detail: N 1 foot at 3 seconds and E
1 foot at 3 seconds, becoming E 1 foot at 2 seconds and N 1 foot
at 3 seconds. Scattered sprinkles. 
.TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 9 seconds and N 1 foot at 2 seconds. 
.MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 3 seconds and E 2 ft at 8 seconds. 
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and
SE 2 ft at 9 seconds. 
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot
at 9 seconds. 
.WED...NE winds around 10 kt. Seas around 2 ft. Wave Detail: NE
1 foot at 2 seconds and S 1 foot at 10 seconds. 
.WED NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely. 
.THU...E winds 5 to 10 kt. Seas around 2 ft. Showers likely. 
.THU NIGHT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Showers
likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		              	
X

ANZ235 Rhode Island Sound

Expires:202604262100;;543031
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ235-262100-
Rhode Island Sound-
405 AM EDT Sun Apr 26 2026

.TODAY...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 4 seconds and S 1 foot at 7 seconds. A chance of rain this
morning, then scattered sprinkles this afternoon. 
.TONIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 5 seconds and E
3 ft at 10 seconds. 
.MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SE 3 ft at 7 seconds and NE 2 ft at 3 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and N
2 ft at 4 seconds. 
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and N 2 ft at
4 seconds. 
.WED...NE winds around 10 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 10 seconds and NE 2 ft at 3 seconds. 
.WED NIGHT...E winds around 10 kt. Seas 3 to 4 ft. Showers
likely. 
.THU...E winds around 10 kt. Seas 2 to 4 ft. Showers likely. 
.THU NIGHT...NW winds 15 to 20 kt. Seas 3 to 5 ft. A chance of
showers.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		
X

ANZ236 Narragansett Bay

Expires:202604262100;;543034
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ236-262100-
Narragansett Bay-
405 AM EDT Sun Apr 26 2026

.TODAY...E winds 5 to 10 kt. Waves around 2 ft. Scattered
sprinkles this morning. 
.TONIGHT...NE winds 5 to 10 kt. Waves around 2 ft. 
.MON...NE winds 5 to 10 kt with gusts up to 20 kt. Waves around
2 ft. 
.MON NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. 
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Waves around 2 ft. 
.WED...NE winds 5 to 10 kt. Waves around 2 ft. 
.WED NIGHT...E winds 5 to 10 kt. Waves around 2 ft. Showers
likely. 
.THU...E winds 5 to 10 kt. Waves around 2 ft. Showers likely. 
.THU NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 3 ft. A chance of showers.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


			
X

ANZ237 Block Island Sound

Expires:202604262100;;543032
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ237-262100-
Block Island Sound-
405 AM EDT Sun Apr 26 2026

.TODAY...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 5 seconds and E 1 foot at 9 seconds. Rain likely this morning,
then scattered sprinkles this afternoon. 
.TONIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 4 seconds and E 3 ft at 10 seconds. 
.MON...NE winds around 10 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SE 3 ft at 7 seconds and NE 2 ft at 4 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and NE
2 ft at 4 seconds. 
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: E 4 ft at 8 seconds and N 3 ft at 4 seconds. 
.WED...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft
at 10 seconds and NE 2 ft at 4 seconds. 
.WED NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely. 
.THU...E winds 5 to 10 kt. Seas 3 to 4 ft. Showers likely. 
.THU NIGHT...NW winds 15 to 20 kt. Seas 3 to 5 ft. A chance of
showers.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


			
X

ANZ250 Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary

Expires:202604262100;;543022
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ250-262100-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
405 AM EDT Sun Apr 26 2026

.TODAY...N winds around 5 kt. Seas around 2 ft. Wave Detail: E
2 ft at 13 seconds and N 1 foot at 3 seconds. 
.TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 12 seconds and N 1 foot at 3 seconds. 
.MON...NE winds around 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 3 seconds and SE 2 ft at 8 seconds. 
.MON NIGHT...NE winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E
4 ft at 9 seconds and E 2 ft at 5 seconds. 
.TUE...NE winds around 10 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft
at 10 seconds and NE 2 ft at 6 seconds. 
.TUE NIGHT...NE winds around 10 kt. Seas 5 to 8 ft. Wave Detail:
E 8 ft at 10 seconds and NE 1 foot at 3 seconds. 
.WED...NE winds around 10 kt. Seas 6 to 8 ft. 
.WED NIGHT...E winds around 10 kt. Seas 6 to 7 ft. Showers
likely. 
.THU...E winds around 10 kt. Seas 5 to 8 ft. Showers.
.THU NIGHT...NE winds 15 to 20 kt. Seas 6 to 8 ft. Showers
likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


	
X

ANZ251 Massachusetts Bay and Ipswich Bay

Expires:202604262100;;543023
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ251-262100-
Massachusetts Bay and Ipswich Bay-
405 AM EDT Sun Apr 26 2026

.TODAY...N winds around 5 kt, becoming E this afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 6 seconds and E 2 ft at
13 seconds. 
.TONIGHT...E winds around 5 kt, becoming NE after midnight. Seas
around 2 ft in the evening, then 1 foot or less. Wave Detail: E
2 ft at 7 seconds and NW 1 foot at 2 seconds, becoming NW 1 foot
at 2 seconds and NE 1 foot at 3 seconds. 
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 3 seconds and SE 2 ft at 8 seconds. 
.MON NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds and NE 2 ft at 4 seconds. 
.TUE...NE winds around 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft
at 7 seconds and N 1 foot at 3 seconds. 
.TUE NIGHT...NE winds around 10 kt. Seas 4 to 6 ft. Wave Detail:
E 6 ft at 10 seconds and SE 4 ft at 11 seconds. 
.WED...NE winds around 10 kt. Seas 4 to 6 ft. 
.WED NIGHT...E winds around 10 kt. Seas 4 to 6 ft. Showers
likely. 
.THU...E winds 5 to 10 kt. Seas 4 to 6 ft. Showers.
.THU NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft. Showers
likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		
X

ANZ254 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM

 
Expires:202604262100;;543025
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ254-262100-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
405 AM EDT Sun Apr 26 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...

.TODAY...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft
at 9 seconds and E 2 ft at 13 seconds. Scattered sprinkles. 
.TONIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and S
2 ft at 8 seconds. 
.MON...NE winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft
at 7 seconds and N 3 ft at 4 seconds. 
.MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas
4 to 6 ft. Wave Detail: E 5 ft at 6 seconds and N 1 foot at
3 seconds. 
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to
7 ft. Wave Detail: E 7 ft at 10 seconds and N 3 ft at 4 seconds. 
.TUE NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 6 to 9 ft. Wave Detail: E 9 ft at 10 seconds and N
4 ft at 4 seconds. 
.WED...NE winds around 10 kt. Seas 6 to 9 ft. 
.WED NIGHT...E winds around 10 kt. Seas 6 to 8 ft. A chance of
showers. 
.THU...E winds around 10 kt. Seas 6 to 8 ft. Showers likely. 
.THU NIGHT...S winds 15 to 20 kt. Seas 5 to 8 ft. Showers likely.
 

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		
X

ANZ255 Coastal waters extending out to 25 NM south of Martha’s Vineyard and Nantucket

Expires:202604262100;;543026
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ255-262100-
Coastal Waters extending out to 25 NM South of Marthas Vineyard
and Nantucket-
405 AM EDT Sun Apr 26 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...

.TODAY...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 4 seconds and E 2 ft at 10 seconds. Rain likely this
morning, then scattered sprinkles this afternoon. 
.TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 4 ft. Wave Detail: E 3 ft at 4 seconds and S
3 ft at 8 seconds. 
.MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: SE 4 ft at 7 seconds and NE 3 ft at 4 seconds.
.MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. Wave Detail: E 6 ft at 8 seconds and N 3 ft at
4 seconds. 
.TUE AND TUE NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft. Wave
Detail: E 7 ft at 10 seconds and N 3 ft at 5 seconds. 
.WED...NE winds 10 to 15 kt. Seas 5 to 7 ft. Wave Detail: E 7 ft
at 10 seconds and NE 4 ft at 5 seconds. 
.WED NIGHT...E winds around 10 kt. Seas 5 to 7 ft. Showers
likely. 
.THU...E winds around 10 kt. Seas 4 to 6 ft. Showers likely. 
.THU NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
5 to 7 ft. Showers likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		
X

ANZ256 Coastal waters from Montauk NY to Martha’s Vineyard extending out to 20 NM south of Block Island

Expires:202604262100;;543027
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ256-262100-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 NM South of Block Island-
405 AM EDT Sun Apr 26 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM EDT THIS MORNING
THROUGH MONDAY MORNING...

.TODAY...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SE 4 ft at 6 seconds and E 2 ft at 13 seconds.
Rain likely this morning, then scattered sprinkles this
afternoon. 
.TONIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 7 seconds and NW 1 foot at 2 seconds. 
.MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: SE 4 ft at 7 seconds and NE 3 ft at 4 seconds.
.MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas
4 to 5 ft. Wave Detail: E 5 ft at 8 seconds and N 3 ft at
4 seconds. 
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 4 to 6 ft. Wave Detail: E 6 ft at 10 seconds and N 3 ft at
5 seconds. 
.WED...NE winds around 10 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft
at 10 seconds and NE 3 ft at 6 seconds. 
.WED NIGHT...E winds around 10 kt. Seas 4 to 5 ft. A chance of
showers. 
.THU...E winds around 10 kt. Seas 4 to 5 ft. Showers likely. 
.THU NIGHT...NW winds 20 to 25 kt. Seas 5 to 7 ft. A chance of
showers.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		
X

ANZ270 Ocean waters from Merrimack River to Plymouth from 40 to 60 NM offshore

			
X

ANZ271 Ocean waters from Provincetown to Nantucket from 20 to 35 NM offshore

		
X

ANZ272 Ocean waters from Martha’s Vineyard to Nantucket from 25 to 40 NM offshore

		
X

ANZ273 Ocean waters from Montauk NY to Martha’s Vineyard from 25 to 40 NM offshore

 
		
X

ANZ230 Boston Harbor

 
Expires:202604262100;;543033
FZUS51 KBOX 260805
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EDT Sun Apr 26 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ230-262100-
Boston Harbor-
405 AM EDT Sun Apr 26 2026

.TODAY...N winds around 5 kt, becoming E this afternoon. Waves
1 foot or less. 
.TONIGHT...E winds around 5 kt, becoming NE after midnight. Waves
1 foot or less. 
.MON...NE winds 5 to 10 kt. Waves 1 foot or less, then around
2 ft in the afternoon. 
.MON NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. 
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. 
.WED...NE winds 5 to 10 kt. Waves 1 foot or less, except 2 to
4 ft at the outer harbor entrance. 
.WED NIGHT...E winds 5 to 10 kt. Waves 1 foot or less, except
2 to 4 ft at the outer harbor entrance. Showers likely. 
.THU...E winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft
at the outer harbor entrance. Showers.
.THU NIGHT...N winds 15 to 20 kt. Waves around 2 ft. Showers
likely.  

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$


		


  • Click on a zone to display the forecast for that area.
ANZ230 Boston Harbor ANZ231 Cape Cod Bay ANZ232 Nantucket Sound ANZ233 Vinyard Sound ANZ234 Buzzards Bay ANZ235 Rhode Island Sound ANZ236 Narragansett Bay ANZ237 Block Island Sound ANZ250 Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary ANZ251 Massachusetts Bay and Ipswich Bay ANZ254 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM ANZ255 Coastal waters extending out to 25 NM south of Martha’s Vineyard and Nantucket ANZ256 Coastal waters from Montauk NY to Martha’s Vineyard extending out to 20 NM south of Block Island ANZ270 Ocean waters from Merrimack River to Plymouth from 40 to 60 NM offshore ANZ271 Ocean waters from Provincetown to Nantucket from 20 to 35 NM offshore ANZ272 Ocean waters from Martha’s Vineyard to Nantucket from 25 to 40 NM offshore ANZ273 Ocean waters from Montauk NY to Martha’s Vineyard from 25 to 40 NM offshore ANZ230 Boston Harbor ANZ231 Cape Cod Bay ANZ232 Nantucket Sound ANZ233 Vinyard Sound ANZ234 Buzzards Bay ANZ235 Rhode Island Sound ANZ236 Narragansett Bay ANZ237 Block Island Sound ANZ250 Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary ANZ251 Massachusetts Bay and Ipswich Bay ANZ254 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM ANZ255 Coastal waters extending out to 25 NM south of Martha’s Vineyard and Nantucket ANZ256 Coastal waters from Montauk NY to Martha’s Vineyard extending out to 20 NM south of Block Island ANZ270 Ocean waters from Merrimack River to Plymouth from 40 to 60 NM offshore ANZ271 Ocean waters from Provincetown to Nantucket from 20 to 35 NM offshore ANZ272 Ocean waters from Martha’s Vineyard to Nantucket from 25 to 40 NM offshore ANZ273 Ocean waters from Montauk NY to Martha’s Vineyard from 25 to 40 NM offshore

 

 



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