fzus51 kbox 210805
cwfbox
expires:202605212100;;390482

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz231-212100-
cape cod bay-
405 am edt thu may 21 2026

.today...ne winds around 10 kt, becoming e this afternoon. seas
around 2 ft. wave detail: n 1 foot at 4 seconds and se 1 foot at
9 seconds. a slight chance of showers this morning. 
.tonight...s winds around 5 kt, becoming nw after midnight. seas
1 foot or less. wave detail: n 1 foot at 4 seconds and se 1 foot
at 9 seconds. 
.fri...ne winds 5 to 10 kt. seas around 2 ft. wave detail: n
1 foot at 4 seconds and se 1 foot at 9 seconds. 
.fri night...se winds around 5 kt. seas 1 foot or less. wave
detail: n 1 foot at 4 seconds and se 1 foot at 10 seconds. 
.sat...e winds around 5 kt, increasing to 5 to 10 kt in the
afternoon. seas 1 foot or less. wave detail: n 1 foot at
4 seconds and se 1 foot at 10 seconds. 
.sat night...e winds 5 to 10 kt. seas 1 foot or less, then around
2 ft after midnight. wave detail: nw 1 foot at 3 seconds and e
1 foot at 3 seconds, becoming e 2 ft at 2 seconds. a chance of
showers after midnight. 
.sun and sun night...e winds 15 to 20 kt with gusts up to 25 kt.
seas 2 to 3 ft. showers.
.mon and mon night...nw winds 5 to 10 kt, becoming w. seas around
2 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390486

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz232-212100-
nantucket sound-
405 am edt thu may 21 2026

.today...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 3 seconds and w 1 foot at 6 seconds. a chance of showers,
mainly this morning. 
.tonight...se winds around 5 kt, becoming nw after midnight. seas
around 2 ft. wave detail: e 1 foot at 3 seconds and w 1 foot at
5 seconds. 
.fri...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 4 seconds and sw 1 foot at 7 seconds. 
.fri night...e winds 5 to 10 kt. seas around 2 ft in the evening,
then 1 foot or less. wave detail: e 1 foot at 3 seconds and n
1 foot at 6 seconds, becoming nw 1 foot at 4 seconds and e 1 foot
at 4 seconds. 
.sat...e winds 5 to 10 kt. seas 1 foot or less, then around 2 ft
in the afternoon. wave detail: n 1 foot at 3 seconds and e 1 foot
at 4 seconds, becoming e 1 foot at 3 seconds and n 1 foot at
3 seconds. 
.sat night...e winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. seas 2 to 3 ft. wave detail: e 2 ft at 3 seconds and se
2 ft at 8 seconds. a chance of showers in the evening, then
showers likely after midnight. 
.sun and sun night...e winds 20 to 25 kt with gusts up to 30 kt.
seas 2 to 4 ft. showers.
.mon and mon night...w winds 5 to 10 kt. seas 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390487

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz233-212100-
vineyard sound-
405 am edt thu may 21 2026

.today...ne winds 10 to 15 kt, becoming e 5 to 10 kt this
afternoon. seas 2 to 3 ft. wave detail: s 3 ft at 7 seconds and w
2 ft at 7 seconds. a chance of showers. 
.tonight...se winds 5 to 10 kt, becoming nw after midnight. seas
around 2 ft. wave detail: e 1 foot at 3 seconds and sw 1 foot at
7 seconds. 
.fri...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
1 foot at 2 seconds and sw 1 foot at 7 seconds. 
.fri night...e winds 5 to 10 kt. seas around 2 ft in the evening,
then 1 foot or less. wave detail: e 1 foot at 3 seconds and nw
1 foot at 6 seconds, becoming ne 1 foot at 3 seconds and s 1 foot
at 7 seconds. 
.sat...e winds 5 to 10 kt. seas 1 foot or less, then around 2 ft
in the afternoon. wave detail: ne 1 foot at 3 seconds and s
1 foot at 8 seconds, becoming nw 1 foot at 3 seconds and e 1 foot
at 3 seconds. 
.sat night...e winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. seas 2 to 3 ft. wave detail: e 2 ft at 3 seconds and s
2 ft at 8 seconds. a chance of showers in the evening, then
showers likely after midnight. 
.sun and sun night...e winds 20 to 25 kt, diminishing to 15 to
20 kt. seas 2 to 4 ft. showers.
.mon and mon night...w winds 5 to 10 kt, becoming sw. seas 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390488

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz234-212100-
buzzards bay-
405 am edt thu may 21 2026

.today...ne winds 10 to 15 kt, becoming e 5 to 10 kt this
afternoon. seas around 2 ft. wave detail: ne 1 foot at 2 seconds
and sw 1 foot at 7 seconds. a chance of showers, mainly this
morning. 
.tonight...se winds 5 to 10 kt, becoming nw after midnight. seas
around 2 ft in the evening, then 1 foot or less. wave detail: e
1 foot at 2 seconds and sw 1 foot at 7 seconds, becoming e 1 foot
at 3 seconds and sw 1 foot at 7 seconds. 
.fri...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
1 foot at 2 seconds and sw 1 foot at 6 seconds. 
.fri night...e winds 5 to 10 kt, diminishing to around 5 kt after
midnight. seas 1 foot or less. wave detail: e 1 foot at 2 seconds
and s 1 foot at 6 seconds. 
.sat...e winds 5 to 10 kt. seas 1 foot or less, then around 2 ft
in the afternoon. wave detail: ne 1 foot at 3 seconds and se
1 foot at 8 seconds, becoming e 1 foot at 2 seconds and nw 1 foot
at 3 seconds. 
.sat night...e winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. seas 2 to 3 ft. wave detail: e 2 ft at 3 seconds and n
1 foot at 3 seconds. a chance of showers in the evening, then
showers likely after midnight. 
.sun and sun night...e winds 15 to 20 kt with gusts up to 25 kt.
seas 2 to 3 ft. showers.
.mon and mon night...nw winds 5 to 10 kt, becoming sw. seas
around 2 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390489

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz235-212100-
rhode island sound-
405 am edt thu may 21 2026

.today...ne winds 10 to 15 kt, becoming e this afternoon. seas
2 to 3 ft. wave detail: sw 3 ft at 7 seconds and ne 2 ft at
4 seconds. a chance of showers.
.tonight...se winds 5 to 10 kt, becoming n after midnight. seas
2 to 3 ft. wave detail: sw 3 ft at 7 seconds and e 1 foot at
3 seconds. 
.fri...e winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 3 seconds and sw 2 ft at 7 seconds. 
.fri night...e winds 5 to 10 kt. seas around 2 ft. wave detail: e
2 ft at 5 seconds and nw 1 foot at 6 seconds. 
.sat...e winds 10 to 15 kt. seas 2 to 3 ft. wave detail: e 3 ft
at 5 seconds. 
.sat night...e winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. gusts up to 25 kt. seas 3 to 5 ft. wave detail: se 5 ft
at 6 seconds and ne 2 ft at 3 seconds. a chance of showers in the
evening, then showers likely after midnight. 
.sun...e winds 20 to 25 kt with gusts up to 30 kt. seas 4 to
6 ft. showers.
.sun night...e winds 15 to 20 kt with gusts up to 25 kt. seas
3 to 5 ft. showers likely. 
.mon and mon night...nw winds 5 to 10 kt, becoming sw. seas 2 to
4 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390492

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz236-212100-
narragansett bay-
405 am edt thu may 21 2026

.today...ne winds around 10 kt, becoming se this afternoon. waves
around 2 ft. a chance of showers, mainly this morning. 
.tonight...s winds 5 to 10 kt, becoming n after midnight. waves
around 2 ft. 
.fri...ne winds around 10 kt, becoming e in the afternoon. waves
around 2 ft. 
.fri night...se winds 5 to 10 kt, becoming e after midnight.
waves around 2 ft in the evening, then 1 foot or less. 
.sat...e winds 5 to 10 kt. waves 1 foot or less, then around 2 ft
in the afternoon. 
.sat night...e winds 10 to 15 kt. gusts up to 20 kt after
midnight. waves 2 to 3 ft. a chance of showers in the evening,
then showers likely after midnight. 
.sun and sun night...e winds 15 to 20 kt, diminishing to 10 to
15 kt. gusts up to 25 kt. waves 2 to 4 ft. showers.
.mon and mon night...nw winds 5 to 10 kt, becoming sw. 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390480

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz250-212100-
coastal waters east of ipswich bay and the stellwagen bank
national marine sanctuary-
405 am edt thu may 21 2026

.today...n winds around 10 kt, becoming e this afternoon. seas
2 to 3 ft. wave detail: n 2 ft at 4 seconds and se 2 ft at
9 seconds. 
.tonight...s winds around 5 kt, becoming n after midnight. seas
around 2 ft. wave detail: w 1 foot at 3 seconds and ne 1 foot at
5 seconds. 
.fri...ne winds around 10 kt, becoming e in the afternoon. seas
around 2 ft. wave detail: n 2 ft at 3 seconds and se 1 foot at
9 seconds. 
.fri night...s winds around 5 kt, becoming w around 5 kt after
midnight. seas around 2 ft. wave detail: n 2 ft at 4 seconds and
se 1 foot at 10 seconds. 
.sat...e winds around 5 kt. seas 1 foot or less. wave detail: w
1 foot at 2 seconds and ne 1 foot at 3 seconds. 
.sat night...se winds 5 to 10 kt. seas 1 foot or less, then
around 2 ft after midnight. wave detail: nw 1 foot at 2 seconds
and e 1 foot at 3 seconds, becoming se 2 ft at 10 seconds and ne
1 foot at 3 seconds. a chance of showers after midnight. 
.sun and sun night...e winds 15 to 20 kt with gusts up to 25 kt.
seas 2 to 4 ft. showers likely. 
.mon and mon night...ne winds 5 to 10 kt with gusts up to 20 kt,
becoming w. 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390483

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz254-212100-
coastal waters from provincetown ma to chatham ma to nantucket ma
out 20 nm-
405 am edt thu may 21 2026

.today...ne winds 10 to 15 kt, diminishing to 5 to 10 kt this
afternoon. seas 2 to 4 ft. wave detail: s 3 ft at 7 seconds and n
2 ft at 4 seconds. a slight chance of showers. 
.tonight...se winds around 5 kt, becoming nw after midnight. seas
2 to 3 ft. wave detail: n 2 ft at 5 seconds and s 2 ft at
7 seconds. 
.fri...ne winds 5 to 10 kt. seas around 2 ft. wave detail: n 2 ft
at 5 seconds and s 2 ft at 8 seconds. 
.fri night...e winds 5 to 10 kt, becoming se after midnight. seas
around 2 ft. wave detail: n 2 ft at 5 seconds and se 1 foot at
8 seconds. 
.sat...e winds 5 to 10 kt. seas around 2 ft. wave detail: se 2 ft
at 9 seconds and n 1 foot at 4 seconds. 
.sat night...e winds 5 to 10 kt, increasing to 10 to 15 kt with
gusts up to 20 kt after midnight. seas 2 to 4 ft. wave detail: se
3 ft at 7 seconds and e 2 ft at 3 seconds. a chance of showers
after midnight. 
.sun and sun night...e winds 20 to 25 kt, diminishing to 15 to
20 kt. gusts up to 30 kt. seas 3 to 5 ft. showers likely. 
.mon and mon night...sw winds 10 to 15 kt with gusts up to 20 kt,
becoming w 5 to 10 kt. seas 4 to 6 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.

$$

fzus51 kbox 210805
cwfbox
expires:202605212100;;390484

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
405 am edt thu may 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz255-212100-
coastal waters extending out to 25 nm south of marthas vineyard
and nantucket-
405 am edt thu may 21 2026

.today...ne winds 10 to 15 kt with gusts up to 20 kt. seas 2 to
4 ft. wave detail: s 4 ft at 7 seconds and nw 3 ft at 6 seconds.
a chance of showers.
.tonight...e winds 5 to 10 kt, becoming ne after midnight. seas
2 to 3 ft. wave detail: s 3 ft at 7 seconds and e 2 ft at
4 seconds. 
.fri...ne winds 10 to 15 kt with gusts up to 20 kt. seas 2 to
3 ft. wave detail: ne 2 ft at 4 seconds and sw 2 ft at 7 seconds.
.fri night...e winds 5 to 10 kt. seas around 2 ft. wave detail: n
2 ft at 5 seconds and se 2 ft at 8 seconds. 
.sat...e 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. 
.sat night...e winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. gusts up to 25 kt. seas 3 to 5 ft. wave detail: se 4 ft
at 7 seconds and n 2 ft at 4 seconds. a chance of showers in the
evening, then showers likely after midnight. 
.sun and sun night...e winds 20 to 25 kt with gusts up to 30 kt.
seas 4 to 6 ft. showers.
.mon and mon night...w winds 5 to 10 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.

$$