Sandy Bay Weather Center
Weather Center


X

ANZ230 Boston Harbor

Expires:202505160300;;552385
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ230-160300-
Boston Harbor-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Waves 1 foot or less.
Isolated showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Waves 1 foot or less. Areas of
fog. Vsby 1 NM or less. 
.FRI...S winds around 5 kt, becoming SE in the afternoon. Waves
1 foot or less. Areas of fog in the morning with vsby 1 NM or
less. 
.FRI NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. A chance
of showers after midnight. 
.SAT...SE winds 5 to 10 kt. Waves 1 foot or less, then around
2 ft in the afternoon. A chance of showers in the morning, then
showers likely in the afternoon. 
.SAT NIGHT...S winds 5 to 10 kt, becoming W after midnight. Waves
around 2 ft in the evening, then 1 foot or less. Showers likely,
mainly in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Waves around 2 ft.  

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:202505160300;;552376
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ231-160300-
Cape Cod Bay-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and SE 1 foot at 3 seconds. Isolated
showers. Vsby 1 NM or less, increasing to 1 to 3 NM. 
.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SE 1 foot at
3 seconds. Areas of fog. Vsby 1 NM or less. 
.FRI...S winds around 5 kt, increasing to 5 to 10 kt in the
afternoon. Seas 1 foot or less. Wave Detail: E 1 foot at
4 seconds and SE 1 foot at 7 seconds. Areas of dense fog in the
morning with vsby 1 NM or less. 
.FRI NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SE 1 foot at 5 seconds and SE 1 foot at 8 seconds. 
.SAT...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: SE 1 foot at 3 seconds and SE
1 foot at 8 seconds, becoming SE 2 ft at 7 seconds and SE 1 foot
at 3 seconds. Showers likely in the afternoon. 
.SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 1 foot at 4 seconds and SE 1 foot at 7 seconds. A chance of
showers. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.  

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:202505160300;;552380
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ232-160300-
Nantucket Sound-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 2 ft at 7 seconds and SE 1 foot at 3 seconds. Scattered
showers this morning. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Seas around 2 ft. Wave Detail: S
2 ft at 8 seconds and E 1 foot at 5 seconds. Areas of fog. Vsby
1 NM or less. 
.FRI...S winds around 5 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and SW 1 foot at 2 seconds. Areas of fog in the
morning with vsby 1 NM or less. 
.FRI NIGHT...S winds around 5 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: SE 2 ft at 7 seconds
and SW 1 foot at 2 seconds, becoming SW 1 foot at 2 seconds and
SE 1 foot at 7 seconds. 
.SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and
SE 1 foot at 7 seconds. A chance of showers in the afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of
showers in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.  

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:202505160300;;552381
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ233-160300-
Vineyard Sound-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds around 10 kt, diminishing to around
5 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and SE
1 foot at 3 seconds. Scattered showers this morning. Vsby 1 to
3 NM. 
.TONIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 8 seconds and E 1 foot at 3 seconds. Areas of fog. Vsby
1 NM or less. 
.FRI...S winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: S 2 ft at 8 seconds and SW 1 foot at
2 seconds. Areas of fog in the morning with vsby 1 NM or less. 
.FRI NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
2 ft at 7 seconds and SW 1 foot at 2 seconds. 
.SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and
S 1 foot at 2 seconds. A chance of showers in the morning, then
showers likely in the afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of showers
in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.  

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:202505160300;;552382
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ234-160300-
Buzzards Bay-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 7 seconds and SE 1 foot at 2 seconds. Isolated
showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Seas around 2 ft. Wave Detail: S
2 ft at 7 seconds and E 1 foot at 3 seconds. Areas of fog. Vsby
1 NM or less. 
.FRI...S winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: SE
2 ft at 6 seconds, becoming SW 1 foot at 2 seconds and E 1 foot
at 4 seconds. Areas of fog in the morning with vsby 1 NM or less.
.FRI NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SW 1 foot at 2 seconds and SE 1 foot at 6 seconds. 
.SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 1 foot or less, then around 2 ft in the
afternoon. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at
3 seconds, becoming S 2 ft at 4 seconds and SE 2 ft at 7 seconds.
A chance of showers in the morning, then showers likely in the
afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of
showers in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.  

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:202505160300;;552383
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ235-160300-
Rhode Island Sound-
1005 AM EDT Thu May 15 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON...

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: S 4 ft at 8 seconds. Isolated showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S
4 ft at 8 seconds and S 1 foot at 5 seconds. Areas of fog. Vsby
1 NM or less. 
.FRI...SW winds around 5 kt, becoming S in the afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 8 seconds. Areas of fog in the
morning with vsby 1 NM or less. 
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds. 
.SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. A
chance of showers in the morning, then showers likely in the
afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas around 3 ft. Wave Detail:
SE 3 ft at 7 seconds. A chance of showers in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 4 ft.  

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:202505160300;;552386
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ236-160300-
Narragansett Bay-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds around 5 kt. Waves 2 to 4 ft. Isolated
showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Waves 2 to 3 ft. Areas of fog.
Vsby 1 NM or less. 
.FRI...S winds around 5 kt, increasing to 5 to 10 kt in the
afternoon. Waves 2 to 3 ft. Areas of fog in the morning with vsby
1 NM or less. 
.FRI NIGHT...S winds around 5 kt. Waves around 2 ft. 
.SAT...S winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers
in the morning, then showers likely in the afternoon. 
.SAT NIGHT...SW winds 5 to 10 kt. Waves 2 to 3 ft. A chance of
showers in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Waves 2 to 3 ft.  

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.

$$

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X

ANZ237 Block Island Sound

Expires:202505160300;;552384
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ237-160300-
Block Island Sound-
1005 AM EDT Thu May 15 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON...

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: S 4 ft at 8 seconds. Isolated showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S
4 ft at 8 seconds. Areas of fog. Vsby 1 NM or less. 
.FRI...SW winds around 5 kt, increasing to 5 to 10 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds.
Areas of fog in the morning with vsby 1 NM or less. 
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and S 1 foot at 7 seconds. A chance of showers
after midnight. 
.SAT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at
7 seconds. A chance of showers in the morning. Showers likely in
the afternoon. 
.SAT NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
S 3 ft at 7 seconds. A chance of showers in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.  

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:202505160300;;552374
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ250-160300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 2 ft at 7 seconds and SE 1 foot at 4 seconds. Isolated
showers. Vsby 1 NM or less, increasing to 1 to 3 NM. 
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds. Areas of fog. Vsby
1 NM or less. 
.FRI...S winds around 5 kt, becoming SE in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. Areas of fog in the
morning with vsby 1 NM or less. 
.FRI NIGHT...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 3 ft at 8 seconds. 
.SAT...SE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and SE 2 ft at
4 seconds. Showers likely in the afternoon. 
.SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 4 ft. Wave Detail: SE 3 ft at
7 seconds and SE 2 ft at 4 seconds. Showers likely, mainly in the
evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 4 ft.  

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:202505160300;;552375
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ251-160300-
Massachusetts Bay and Ipswich Bay-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 1 foot at 3 seconds and SE 1 foot at 7 seconds.
Isolated showers. Vsby 1 NM or less, increasing to 1 to 3 NM. 
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and E 1 foot at
3 seconds. Areas of fog. Vsby 1 NM or less. 
.FRI...S winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds. Areas of dense
fog in the morning with vsby 1 NM or less. 
.FRI NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and E 1 foot at 4 seconds. 
.SAT...SE winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and
SE 2 ft at 8 seconds. A chance of showers in the morning, then
showers likely in the afternoon. 
.SAT NIGHT...S winds around 10 kt, becoming W after midnight.
Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and SE 1 foot
at 7 seconds. Showers likely, mainly in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.  

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:202505160300;;552377
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ254-160300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1005 AM EDT Thu May 15 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.THIS AFTERNOON...SE winds around 10 kt. Seas 3 to 4 ft. Wave
Detail: S 4 ft at 8 seconds. Scattered showers this morning. Vsby
1 NM or less, increasing to 1 to 3 NM. 
.TONIGHT...S winds 5 to 10 kt, diminishing to around 5 kt after
midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Areas
of fog. Vsby 1 NM or less. 
.FRI...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft
at 8 seconds. Areas of fog in the morning with vsby 1 NM or less.
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds. 
.SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds. A
chance of showers in the afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S
3 ft at 7 seconds. A chance of showers. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Seas 3 to 5 ft.  

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:202505160300;;552378
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ255-160300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1005 AM EDT Thu May 15 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: S 5 ft at 8 seconds. Scattered showers this morning. Vsby
1 to 3 NM. 
.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
3 to 5 ft. Wave Detail: S 4 ft at 8 seconds. Areas of fog. Vsby
1 NM or less. 
.FRI...SW winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft
at 8 seconds. Areas of fog in the morning with vsby 1 NM or less.
.FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds. 
.SAT...S winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 7 seconds. A chance of showers in the afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 7 seconds. A chance of showers in the evening. 
.SUN THROUGH MON NIGHT...N winds 10 to 15 kt with gusts up to
20 kt. Seas 3 to 5 ft.  

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:202505160300;;552379
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ256-160300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1005 AM EDT Thu May 15 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: S 5 ft at 8 seconds. Isolated showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Seas 3 to 5 ft. Wave Detail: S
5 ft at 8 seconds. Areas of fog. Vsby 1 NM or less. 
.FRI...SW winds around 5 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 8 seconds. Areas of fog in the morning with vsby 1 NM or less.
.FRI NIGHT...S winds 5 to 10 kt. Seas around 3 ft. Wave Detail:
SE 3 ft at 7 seconds. 
.SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds. A
chance of showers in the morning, then showers likely in the
afternoon. 
.SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S
4 ft at 7 seconds and SE 2 ft at 8 seconds. A chance of showers
in the evening. 
.SUN THROUGH MON NIGHT...NW winds 15 to 20 kt. Seas 3 to 5 ft.  

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:202505160300;;552385
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1005 AM EDT Thu May 15 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM


ANZ230-160300-
Boston Harbor-
1005 AM EDT Thu May 15 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Waves 1 foot or less.
Isolated showers. Vsby 1 to 3 NM. 
.TONIGHT...S winds around 5 kt. Waves 1 foot or less. Areas of
fog. Vsby 1 NM or less. 
.FRI...S winds around 5 kt, becoming SE in the afternoon. Waves
1 foot or less. Areas of fog in the morning with vsby 1 NM or
less. 
.FRI NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. A chance
of showers after midnight. 
.SAT...SE winds 5 to 10 kt. Waves 1 foot or less, then around
2 ft in the afternoon. A chance of showers in the morning, then
showers likely in the afternoon. 
.SAT NIGHT...S winds 5 to 10 kt, becoming W after midnight. Waves
around 2 ft in the evening, then 1 foot or less. Showers likely,
mainly in the evening. 
.SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to
20 kt. Waves around 2 ft.  

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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