fzus51 kbox 210503
cwfbox
expires:202609211800;;799140

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz231-211800-
cape cod bay-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through this evening...

.rest of tonight...ne winds 5 to 10 kt with gusts up to 20 kt.
seas around 2 ft. wave detail: se 1 foot at 3 seconds and e
1 foot at 9 seconds. patchy fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 15 to 20 kt with gusts up to 25 kt. seas 2 to
4 ft. wave detail: ne 3 ft at 4 seconds and w 2 ft at 5 seconds.
patchy fog in the morning. a chance of showers in the morning
with vsby 1 to 3 nm. 
.mon night...ne winds 10 to 15 kt, increasing to 15 to 20 kt
after midnight. gusts up to 25 kt. seas 2 to 3 ft. wave detail: n
2 ft at 5 seconds and se 1 foot at 10 seconds. 
.tue...ne winds 15 to 20 kt with gusts up to 25 kt. seas 3 to
4 ft. wave detail: n 3 ft at 4 seconds and se 1 foot at
9 seconds. 
.tue night...ne winds 15 to 20 kt with gusts up to 30 kt. seas
3 to 4 ft. wave detail: n 3 ft at 4 seconds and se 1 foot at
18 seconds. 
.wed and wed night...ne winds 20 to 25 kt with gusts up to 35 kt.
seas 4 to 6 ft. wave detail: e 6 ft at 9 seconds and ne 5 ft at
5 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 40 kt. seas 4 to
6 ft. 
.thu night through fri night...ne winds 25 to 35 kt with gusts up
to 45 kt. seas 5 to 8 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 210503
cwfbox
expires:202609211800;;799144

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz232-211800-
nantucket sound-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through this evening...

.rest of tonight...e winds 5 to 10 kt. seas around 2 ft. wave
detail: se 1 foot at 4 seconds and se 1 foot at 9 seconds. patchy
fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 15 to 20 kt with gusts up to 25 kt. seas 2 to
3 ft. wave detail: ne 3 ft at 4 seconds and s 1 foot at
5 seconds. patchy fog in the morning. a chance of showers in the
morning with vsby 1 to 3 nm. 
.mon night...ne winds 15 to 20 kt with gusts up to 25 kt. seas
2 to 3 ft. wave detail: ne 3 ft at 4 seconds and w 1 foot at
5 seconds. 
.tue...ne winds around 20 kt with gusts up to 30 kt. seas 3 to
4 ft. wave detail: ne 3 ft at 4 seconds and se 1 foot at
8 seconds. 
.tue night...ne winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. gusts up to 30 kt. seas 3 to 5 ft. wave detail:
ne 4 ft at 5 seconds and se 1 foot at 9 seconds. 
.wed...ne winds 20 to 25 kt with gusts up to 30 kt. seas 4 to
6 ft. wave detail: e 5 ft at 5 seconds and se 3 ft at 12 seconds.
.wed night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
5 to 7 ft. 
.thu...ne winds 25 to 30 kt with gusts up to 40 kt. seas 5 to
7 ft. 
.thu night through fri night...ne winds 25 to 35 kt with gusts up
to 45 kt. seas 5 to 8 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 210503
cwfbox
expires:202609211800;;799145

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz233-211800-
vineyard sound-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through this evening...

.rest of tonight...e winds 5 to 10 kt. seas around 2 ft. wave
detail: s 1 foot at 4 seconds and se 1 foot at 10 seconds. patchy
fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 20 to 25 kt with gusts up to 30 kt. seas 2 to
4 ft. wave detail: ne 2 ft at 3 seconds and sw 1 foot at
5 seconds. patchy fog in the morning. a chance of showers in the
morning. 
.mon night...ne winds 15 to 20 kt. seas 2 to 3 ft. wave detail:
ne 2 ft at 3 seconds and w 1 foot at 5 seconds. 
.tue...ne winds 15 to 20 kt with gusts up to 30 kt. seas 3 to
4 ft. wave detail: ne 3 ft at 4 seconds and se 1 foot at
8 seconds. 
.tue night...ne winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. gusts up to 30 kt. seas 3 to 4 ft. wave detail:
ne 3 ft at 4 seconds and se 1 foot at 10 seconds. 
.wed and wed night...ne winds 20 to 25 kt with gusts up to 30 kt.
seas 4 to 6 ft. wave detail: ne 4 ft at 4 seconds and se 3 ft at
10 seconds.
.thu...ne winds 25 to 30 kt with gusts up to 40 kt. seas 4 to
6 ft. 
.thu night through fri night...ne winds 25 to 30 kt with gusts up
to 45 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 210503
cwfbox
expires:202609211800;;799146

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz234-211800-
buzzards bay-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through this evening...

.rest of tonight...ne winds 5 to 10 kt. seas 1 foot or less. wave
detail: s 1 foot at 3 seconds and se 1 foot at 9 seconds. patchy
fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 20 to 25 kt with gusts up to 30 kt. seas 2 to
4 ft. wave detail: ne 2 ft at 3 seconds and sw 1 foot at
5 seconds. patchy fog in the morning. a chance of showers in the
morning. 
.mon night...ne winds 10 to 15 kt, increasing to 15 to 20 kt
after midnight. seas 2 to 3 ft. wave detail: ne 2 ft at 3 seconds
and w 1 foot at 5 seconds. 
.tue...ne winds 15 to 20 kt with gusts up to 30 kt. seas 2 to
4 ft. wave detail: ne 2 ft at 4 seconds and se 1 foot at
8 seconds. 
.tue night...ne winds 15 to 20 kt with gusts up to 30 kt. seas
3 to 4 ft. wave detail: ne 3 ft at 4 seconds and se 1 foot at
10 seconds. 
.wed...ne winds 20 to 25 kt with gusts up to 30 kt. seas 4 to
6 ft. wave detail: ne 3 ft at 4 seconds and se 2 ft at
10 seconds. 
.wed night...ne winds 20 to 25 kt with gusts up to 30 kt. seas
3 to 5 ft. 
.thu...ne winds 25 to 30 kt with gusts up to 40 kt. seas 4 to
6 ft. 
.thu night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
3 to 5 ft. a chance of showers. 
.fri and fri night...ne winds 25 to 30 kt with gusts up to 45 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 210503
cwfbox
expires:202609211800;;799147

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz235-211800-
rhode island sound-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through this evening...

.rest of tonight...e winds 10 to 15 kt with gusts up to 20 kt.
seas around 2 ft. wave detail: s 2 ft at 5 seconds and se 2 ft at
10 seconds. patchy fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 20 to 25 kt. seas 2 to 4 ft. wave detail: ne 3 ft
at 6 seconds and se 2 ft at 9 seconds. patchy fog in the morning.
a chance of showers in the morning. 
.mon night...ne winds 15 to 20 kt with gusts up to 25 kt. seas
2 to 4 ft. wave detail: ne 3 ft at 4 seconds and se 2 ft at
8 seconds. 
.tue...ne winds 20 to 25 kt with gusts up to 30 kt. seas 3 to
5 ft. wave detail: ne 5 ft at 5 seconds and se 2 ft at 8 seconds.
.tue night...ne winds 20 to 25 kt with gusts up to 30 kt. seas
4 to 6 ft. wave detail: ne 5 ft at 5 seconds and se 1 foot at
13 seconds. 
.wed and wed night...ne winds 25 to 30 kt with gusts up to 35 kt.
seas 5 to 8 ft. wave detail: se 7 ft at 10 seconds and ne 6 ft at
6 seconds.
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 6 to
9 ft. 
.thu night and fri...ne winds 25 to 35 kt with gusts up to 40 kt.
seas 6 to 9 ft. a chance of showers. 
.fri night...ne winds 25 to 35 kt with gusts up to 40 kt. seas
5 to 8 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 210503
cwfbox
expires:202609211800;;799150

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz236-211800-
narragansett bay-
103 am edt mon sep 21 2026

.rest of tonight...ne winds 10 to 15 kt with gusts up to 20 kt.
waves around 2 ft. patchy fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 15 to 20 kt with gusts up to 25 kt. waves 2 to
3 ft. patchy fog in the morning. 
.mon night...ne winds 10 to 15 kt with gusts up to 20 kt. waves
around 2 ft. 
.tue...ne winds 15 to 20 kt with gusts up to 25 kt. waves 2 to
3 ft. 
.tue night through wed night...ne winds 15 to 20 kt with gusts up
to 30 kt. waves 2 to 3 ft, except 4 to 6 ft at the bay entrance. 
.thu...ne winds 20 to 25 kt with gusts up to 35 kt. waves around
3 ft, except 4 to 6 ft at the bay entrance. 
.thu night through fri night...n winds 25 to 30 kt with gusts up
to 40 kt. waves 2 to 3 ft, except 4 to 6 ft at the bay entrance.
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 210503
cwfbox
expires:202609211800;;799138

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz250-211800-
coastal waters east of ipswich bay and the stellwagen bank
national marine sanctuary-
103 am edt mon sep 21 2026

.rest of tonight...ne winds 15 to 20 kt. seas 2 to 3 ft. wave
detail: se 2 ft at 4 seconds and se 1 foot at 9 seconds. patchy
fog. showers. vsby 1 to 3 nm. 
.mon...ne winds 15 to 20 kt with gusts up to 25 kt. seas 2 to
4 ft. wave detail: n 4 ft at 6 seconds and se 2 ft at 9 seconds.
patchy fog in the morning. 
.mon night...ne winds 10 to 15 kt, increasing to 15 to 20 kt with
gusts up to 25 kt after midnight. seas 2 to 3 ft, building to
3 to 5 ft after midnight. wave detail: ne 3 ft at 5 seconds and w
3 ft at 6 seconds, becoming n 4 ft at 5 seconds and se 2 ft at
9 seconds. 
.tue...ne winds 15 to 20 kt with gusts up to 25 kt. seas 4 to
5 ft. wave detail: e 5 ft at 7 seconds and n 1 foot at 4 seconds.
.tue night...ne winds 15 to 20 kt with gusts up to 30 kt. seas
4 to 6 ft. wave detail: e 6 ft at 7 seconds and n 1 foot at
4 seconds. 
.wed...ne winds 20 to 25 kt with gusts up to 30 kt. seas 5 to
8 ft. wave detail: e 8 ft at 8 seconds. 
.wed night...ne winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. gusts up to 30 kt. seas 7 to 10 ft. 
.thu and thu night...ne winds 20 to 25 kt with gusts up to 35 kt.
seas 9 to 12 ft. 
.fri and fri night...ne winds 25 to 30 kt with gusts up to 40 kt.
seas 9 to 12 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 210503
cwfbox
expires:202609211800;;799141

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz254-211800-
coastal waters from provincetown ma to chatham ma to nantucket ma
out 20 nm-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through late tonight...

.rest of tonight...e winds 5 to 10 kt. seas around 2 ft. wave
detail: se 2 ft at 4 seconds and se 2 ft at 9 seconds. patchy
fog. showers. vsby 1 nm or less. 
.mon...ne winds 15 to 20 kt with gusts up to 25 kt. seas 2 to
4 ft. wave detail: ne 4 ft at 5 seconds and se 2 ft at 9 seconds.
patchy fog. a chance of showers in the morning with vsby 1 to
3 nm. 
.mon night...ne winds 15 to 20 kt with gusts up to 25 kt. seas
3 to 5 ft. wave detail: ne 4 ft at 6 seconds and se 2 ft at
9 seconds. 
.tue...ne winds 15 to 20 kt with gusts up to 25 kt. seas 4 to
6 ft. wave detail: e 5 ft at 7 seconds and n 1 foot at 3 seconds.
.tue night...ne winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. gusts up to 30 kt. seas 4 to 6 ft, building to
5 to 8 ft after midnight. wave detail: n 6 ft at 5 seconds and se
2 ft at 14 seconds, becoming ne 7 ft at 7 seconds and n 1 foot at
4 seconds. 
.wed...ne winds 20 to 25 kt with gusts up to 30 kt. seas 7 to
10 ft. wave detail: e 9 ft at 9 seconds. 
.wed night...ne winds 25 to 30 kt. seas 9 to 13 ft. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 9 to
13 ft. 
.thu night and fri...ne winds 25 to 30 kt with gusts up to 40 kt.
seas 10 to 14 ft. a chance of showers. 
.fri night...ne winds 25 to 35 kt with gusts up to 40 kt. seas
9 to 13 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 210503
cwfbox
expires:202609211800;;799142

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
103 am edt mon sep 21 2026

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


anz255-211800-
coastal waters extending out to 25 nm south of marthas vineyard
and nantucket-
103 am edt mon sep 21 2026

...small craft advisory in effect from 8 am edt this morning
through late tonight...
...gale watch in effect from tuesday afternoon through thursday
afternoon...

.rest of tonight...se winds 5 to 10 kt. seas around 2 ft. wave
detail: e 2 ft at 5 seconds and se 2 ft at 9 seconds. patchy fog.
showers with a slight chance of tstms. vsby 1 nm or less. 
.mon...ne winds 20 to 25 kt. seas 2 to 4 ft, building to 4 to
5 ft in the afternoon. wave detail: ne 3 ft at 5 seconds and se
2 ft at 9 seconds, becoming ne 4 ft at 5 seconds and se 2 ft at
8 seconds. patchy fog. a chance of showers in the morning with
vsby 1 to 3 nm. 
.mon night...ne winds 15 to 20 kt with gusts up to 25 kt. seas
4 to 5 ft. wave detail: ne 4 ft at 5 seconds and se 2 ft at
8 seconds. 
.tue...ne winds 20 to 25 kt with gusts up to 30 kt. seas 4 to
6 ft. wave detail: ne 5 ft at 5 seconds and se 2 ft at 8 seconds.
.tue night...ne winds 20 to 25 kt with gusts up to 30 kt. seas
5 to 8 ft. wave detail: ne 7 ft at 7 seconds and n 1 foot at
4 seconds. 
.wed...ne winds 25 to 30 kt with gusts up to 35 kt. seas 7 to
10 ft. wave detail: e 8 ft at 7 seconds and e 8 ft at 9 seconds. 
.wed night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
9 to 12 ft. 
.thu...ne winds around 30 kt with gusts up to 40 kt. seas 9 to
12 ft. 
.thu night and fri...ne winds 30 to 35 kt. gusts up to 45 kt.
seas 9 to 13 ft. a chance of showers. 
.fri night...ne winds 30 to 35 kt with gusts up to 40 kt. seas
8 to 11 ft. a chance of showers.  

winds and seas higher in and near tstms.

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.

$$