fzus51 kbox 180505
cwfbox
expires:202604181800;;560998

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz231-181800-
cape cod bay-
104 am edt sat apr 18 2026

.rest of tonight...ne winds 5 to 10 kt. seas around 2 ft. wave
detail: n 1 foot at 3 seconds and se 1 foot at 8 seconds. areas
of fog. vsby 1 nm or less. 
.sat...ne winds 5 to 10 kt. seas around 2 ft. wave detail: n
1 foot at 3 seconds and s 1 foot at 8 seconds. areas of fog. vsby
1 nm or less, increasing to 1 to 3 nm in the afternoon. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
around 2 ft. wave detail: ne 1 foot at 4 seconds and s 1 foot at
7 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm. 
.sun...s winds 5 to 10 kt, becoming sw 10 to 15 kt with gusts up
to 20 kt in the afternoon. seas around 2 ft. wave detail: n
1 foot at 4 seconds and s 1 foot at 6 seconds. patchy fog. a
chance of rain in the morning, then rain and snow likely in the
afternoon. vsby 1 to 3 nm in the morning. 
.sun night...nw winds 10 to 15 kt with gusts up to 25 kt. seas
2 to 3 ft. wave detail: nw 2 ft at 4 seconds and s 1 foot at
5 seconds. patchy fog in the evening. rain and snow likely in the
evening. 
.mon and mon night...n winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: nw 2 ft at 4 seconds and s 1 foot at 6 seconds. 
.tue through wed night...w winds 10 to 15 kt with gusts up to
20 kt. seas 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;561002

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz232-181800-
nantucket sound-
104 am edt sat apr 18 2026

.rest of tonight...ne winds 10 to 15 kt. seas around 2 ft. wave
detail: n 2 ft at 4 seconds and s 1 foot at 7 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 4 seconds and s 1 foot at 7 seconds. areas of fog. vsby
1 nm or less, increasing to 1 to 3 nm in the afternoon. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
around 2 ft. wave detail: ne 2 ft at 4 seconds and s 1 foot at
7 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm. 
.sun...s winds 10 to 15 kt, becoming sw in the afternoon. gusts
up to 20 kt. seas 2 to 3 ft. wave detail: w 2 ft at 3 seconds and
se 2 ft at 7 seconds. patchy fog. rain and snow likely in the
afternoon. vsby 1 to 3 nm in the morning. 
.sun night...nw winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. seas 2 to 3 ft. wave detail: w 2 ft at 3 seconds
and s 2 ft at 6 seconds. patchy fog in the evening. rain and snow
likely in the evening. 
.mon and mon night...n winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: nw 2 ft at 3 seconds and ne 2 ft at 6 seconds. 
.tue through wed night...nw winds 15 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;561003

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz233-181800-
vineyard sound-
104 am edt sat apr 18 2026

.rest of tonight...ne winds around 10 kt. seas 2 to 3 ft. wave
detail: sw 3 ft at 7 seconds and n 1 foot at 4 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. seas around 2 ft. wave detail: n
2 ft at 4 seconds and sw 2 ft at 7 seconds. areas of fog. vsby
1 nm or less in the morning. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
around 2 ft. wave detail: ne 1 foot at 4 seconds and s 1 foot at
6 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm. 
.sun...s winds 10 to 15 kt, becoming w in the afternoon. gusts up
to 20 kt. seas 2 to 3 ft. wave detail: w 2 ft at 3 seconds and se
2 ft at 7 seconds. patchy fog. a chance of rain in the morning,
then rain and snow likely in the afternoon. vsby 1 to 3 nm in the
morning. 
.sun night...nw winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. seas 2 to 3 ft. wave detail: sw 3 ft at 5 seconds
and e 1 foot at 8 seconds. patchy fog in the evening. rain and
snow likely in the evening. 
.mon and mon night...n winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: sw 2 ft at 6 seconds and e 1 foot at 8 seconds. 
.tue...ne winds 10 to 15 kt. seas around 2 ft. 
.tue night through wed night...nw winds 15 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;561004

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz234-181800-
buzzards bay-
104 am edt sat apr 18 2026

.rest of tonight...ne winds around 10 kt. seas around 2 ft. wave
detail: sw 2 ft at 7 seconds and n 1 foot at 3 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. seas around 2 ft. wave detail: n
1 foot at 3 seconds and sw 1 foot at 7 seconds. areas of fog in
the morning with vsby 1 nm or less. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
around 2 ft in the evening, then 1 foot or less. wave detail: ne
1 foot at 4 seconds and s 1 foot at 6 seconds. areas of fog in
the evening. patchy fog after midnight. vsby 1 to 3 nm. 
.sun...s winds 10 to 15 kt, becoming w in the afternoon. gusts up
to 20 kt. seas around 2 ft. wave detail: sw 2 ft at 4 seconds and
e 1 foot at 5 seconds. patchy fog. a chance of rain in the
morning, then rain with snow likely in the afternoon. vsby 1 to
3 nm in the morning. 
.sun night...nw winds 10 to 15 kt. gusts up to 20 kt in the
evening. seas 2 to 3 ft. wave detail: w 2 ft at 4 seconds and e
1 foot at 7 seconds. patchy fog in the evening. rain and snow
likely in the evening. 
.mon and mon night...n winds 10 to 15 kt. seas around 2 ft. wave
detail: sw 2 ft at 6 seconds and e 2 ft at 7 seconds. 
.tue through wed night...nw winds 15 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;561005

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz235-181800-
rhode island sound-
104 am edt sat apr 18 2026

.rest of tonight...ne winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: s 3 ft at 7 seconds and n 1 foot at 4 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. seas 2 to 3 ft. wave detail: s 3 ft
at 7 seconds and n 2 ft at 4 seconds. areas of fog in the morning
with vsby 1 nm or less. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
around 2 ft. wave detail: ne 2 ft at 4 seconds and s 2 ft at
7 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm in the evening. 
.sun...s winds 10 to 15 kt, becoming w 15 to 20 kt in the
afternoon. seas 2 to 3 ft. wave detail: se 3 ft at 6 seconds and
w 2 ft at 3 seconds. patchy fog. a chance of rain in the morning,
then rain with snow likely in the afternoon. vsby 1 to 3 nm in
the morning. 
.sun night...nw winds 15 to 20 kt with gusts up to 25 kt. seas
2 to 4 ft. wave detail: w 3 ft at 4 seconds and se 3 ft at
7 seconds. patchy fog in the evening. rain and snow likely in the
evening. 
.mon and mon night...n winds 10 to 15 kt with gusts up to 20 kt.
seas 2 to 3 ft. wave detail: w 2 ft at 3 seconds and se 2 ft at
7 seconds. 
.tue...n winds 10 to 15 kt with gusts up to 20 kt. seas around
2 ft. 
.tue night through wed night...nw winds 15 to 20 kt with gusts up
to 25 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;561008

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz236-181800-
narragansett bay-
104 am edt sat apr 18 2026

.rest of tonight...n winds 5 to 10 kt. waves around 2 ft. areas
of fog. vsby 1 nm or less. 
.sat...ne winds around 10 kt. waves around 2 ft. areas of fog in
the morning with vsby 1 nm or less. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. waves
around 2 ft.  with patchy fog. 
.sun...s winds 5 to 10 kt, becoming w 10 to 15 kt with gusts up
to 20 kt in the afternoon. waves around 2 ft. patchy fog. rain.
snow likely in the afternoon. vsby 1 to 3 nm in the morning. 
.sun night...nw winds 10 to 15 kt. gusts up to 20 kt in the
evening. waves 2 to 3 ft. patchy fog in the evening. rain and
snow likely in the evening. 
.mon and mon night...n winds 5 to 10 kt. waves around 2 ft. 
.tue through wed 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;560996

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz250-181800-
coastal waters east of ipswich bay and the stellwagen bank
national marine sanctuary-
104 am edt sat apr 18 2026

.rest of tonight...ne winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: n 2 ft at 4 seconds and se 2 ft at 8 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. gusts up to 20 kt in the morning.
seas 2 to 4 ft. wave detail: e 3 ft at 7 seconds and n 1 foot at
3 seconds. areas of fog. vsby 1 nm or less, increasing to 1 to
3 nm in the afternoon. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
3 to 4 ft. wave detail: e 4 ft at 8 seconds and n 1 foot at
3 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm. 
.sun...s winds 5 to 10 kt, becoming sw 10 to 15 kt with gusts up
to 20 kt in the afternoon. seas 3 to 4 ft. wave detail: e 4 ft at
8 seconds and sw 2 ft at 4 seconds. patchy fog. a chance of rain
in the morning, then rain with snow likely in the afternoon. vsby
1 to 3 nm in the morning. 
.sun night...nw winds 15 to 20 kt with gusts up to 25 kt. seas
3 to 4 ft. wave detail: e 4 ft at 8 seconds and w 3 ft at
4 seconds. patchy fog in the evening. rain and snow likely in the
evening. 
.mon and mon night...n winds 15 to 20 kt. seas 2 to 4 ft. wave
detail: w 3 ft at 4 seconds and se 2 ft at 7 seconds. 
.tue through wed night...w winds 15 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;560999

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz254-181800-
coastal waters from provincetown ma to chatham ma to nantucket ma
out 20 nm-
104 am edt sat apr 18 2026

.rest of tonight...ne winds 10 to 15 kt. seas 2 to 4 ft. wave
detail: s 3 ft at 7 seconds and n 2 ft at 4 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. gusts up to 20 kt in the morning.
seas 2 to 4 ft. wave detail: n 3 ft at 4 seconds and s 3 ft at
7 seconds. areas of fog. vsby 1 nm or less, increasing to 1 to
3 nm in the afternoon. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
3 to 5 ft. wave detail: e 5 ft at 8 seconds and s 2 ft at
7 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm. 
.sun...s winds 10 to 15 kt with gusts up to 20 kt. seas 3 to
5 ft. wave detail: e 5 ft at 8 seconds and sw 3 ft at 5 seconds.
patchy fog. rain and snow likely in the afternoon. vsby 1 to 3 nm
in the morning. 
.sun night...nw winds 15 to 20 kt with gusts up to 25 kt. seas
3 to 5 ft. wave detail: e 4 ft at 8 seconds and nw 3 ft at
4 seconds. rain and snow likely in the evening, then a chance of
rain after midnight. patchy fog in the evening. 
.mon and mon night...n winds 10 to 15 kt with gusts up to 20 kt.
seas 2 to 4 ft. wave detail: nw 3 ft at 5 seconds and se 2 ft at
7 seconds. 
.tue through wed night...w winds 15 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.

$$

fzus51 kbox 180505
cwfbox
expires:202604181800;;561000

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
104 am edt sat apr 18 2026

coastal waters from the merrimack river ma to watch hill ri out
to 25 nm


anz255-181800-
coastal waters extending out to 25 nm south of marthas vineyard
and nantucket-
104 am edt sat apr 18 2026

.rest of tonight...ne winds 10 to 15 kt. seas 3 to 4 ft. wave
detail: s 4 ft at 7 seconds and n 2 ft at 4 seconds. areas of
fog. vsby 1 nm or less. 
.sat...ne winds 10 to 15 kt. seas 2 to 4 ft. wave detail: s 3 ft
at 7 seconds and n 2 ft at 4 seconds. areas of fog. vsby 1 nm or
less, increasing to 1 to 3 nm in the afternoon. 
.sat night...e winds 5 to 10 kt, becoming s after midnight. seas
2 to 3 ft. wave detail: ne 3 ft at 5 seconds and s 2 ft at
7 seconds. areas of fog in the evening. patchy fog after
midnight. vsby 1 to 3 nm. 
.sun...s winds 10 to 15 kt, becoming sw 15 to 20 kt in the
afternoon. seas 3 to 5 ft. wave detail: sw 4 ft at 4 seconds and
e 4 ft at 8 seconds. patchy fog. rain likely in the afternoon.
vsby 1 to 3 nm in the morning. 
.sun night...nw winds 15 to 20 kt with gusts up to 25 kt. seas
4 to 5 ft. wave detail: w 4 ft at 6 seconds and e 3 ft at
8 seconds. patchy fog in the evening. rain and snow likely in the
evening. 
.mon...w winds 10 to 15 kt. seas 3 to 5 ft. wave detail: w 3 ft
at 5 seconds and se 2 ft at 7 seconds. 
.mon night...nw winds 10 to 15 kt, becoming n 15 to 20 kt after
midnight. seas 2 to 4 ft. 
.tue...n winds 15 to 20 kt. seas 2 to 4 ft. 
.tue night and wed...sw winds 15 to 20 kt. seas 3 to 5 ft. 
.wed night...nw winds 10 to 15 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.

$$