fzus51 kbox 210803
cwfbox
expires:202609212100;;807578

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

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


anz231-212100-
cape cod bay-
403 am edt mon sep 21 2026

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

.today...ne winds 15 to 20 kt with gusts up to 25 kt. seas 2 to
4 ft. wave detail: n 3 ft at 4 seconds and e 1 foot at 9 seconds.
patchy fog this morning. a chance of showers this morning with
vsby 1 to 3 nm. 
.tonight...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 3 ft
at 5 seconds and e 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
14 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
10 seconds. 
.wed and wed night...ne winds 20 to 25 kt with gusts up to 30 kt.
seas 3 to 5 ft. wave detail: e 5 ft at 10 seconds and ne 4 ft at
4 seconds. 
.thu...ne winds 20 to 25 kt with gusts up to 35 kt. seas 4 to
6 ft. wave detail: e 6 ft at 10 seconds and n 5 ft at 5 seconds. 
.thu night...ne winds 25 to 30 kt with gusts up to 40 kt. seas
4 to 6 ft. a chance of showers. 
.fri...ne winds around 30 kt with gusts up to 45 kt. seas 5 to
7 ft. a chance of showers. 
.fri night...ne winds 25 to 35 kt with gusts up to 45 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807582

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

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


anz232-212100-
nantucket sound-
403 am edt mon sep 21 2026

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

.today...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 sw 1 foot at
4 seconds. patchy fog this morning. a chance of showers this
morning with vsby 1 to 3 nm. 
.tonight...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
7 seconds. 
.tue...ne winds around 20 kt with gusts up to 30 kt. seas 3 to
4 ft. wave detail: n 4 ft at 5 seconds and se 1 foot at
9 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 4 ft at 5 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 5 ft at 5 seconds and se 4 ft at 9 seconds.
.wed night...ne winds 20 to 25 kt, increasing to 25 to 30 kt
after midnight. seas 5 to 7 ft. wave detail: ne 5 ft at 5 seconds
and e 5 ft at 10 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 5 to
7 ft. 
.thu night...ne winds 25 to 30 kt with gusts up to 40 kt. seas
5 to 7 ft. a chance of showers. 
.fri...ne winds around 30 kt with gusts up to 50 kt. seas 5 to
7 ft. showers likely. 
.fri night...ne winds 30 to 35 kt with gusts up to 50 kt. seas
6 to 9 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807583

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

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


anz233-212100-
vineyard sound-
403 am edt mon sep 21 2026

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

.today...ne winds 20 to 25 kt with gusts up to 30 kt. seas 2 to
4 ft. wave detail: ne 3 ft at 4 seconds and sw 1 foot at
5 seconds. patchy fog this morning. a chance of showers this
morning. 
.tonight...ne winds 15 to 20 kt. seas 2 to 3 ft. wave detail: ne
2 ft at 4 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: n 3 ft at 5 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 9 seconds. 
.wed and wed night...ne winds 20 to 25 kt with gusts up to 30 kt.
seas 3 to 5 ft. wave detail: ne 3 ft at 4 seconds and se 3 ft at
9 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 4 to
6 ft. wave detail: ne 4 ft at 5 seconds and e 3 ft at 12 seconds.
.thu night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
4 to 6 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. 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807584

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

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


anz234-212100-
buzzards bay-
403 am edt mon sep 21 2026

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

.today...ne winds 20 to 25 kt with gusts up to 30 kt. seas 2 to
4 ft. wave detail: ne 3 ft at 4 seconds and sw 1 foot at
5 seconds. patchy fog this morning. a chance of showers this
morning. 
.tonight...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 4 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: n 3 ft at 5 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 5 seconds and se 2 ft at
11 seconds. 
.wed night...ne winds 20 to 25 kt with gusts up to 30 kt. seas
3 to 5 ft. wave detail: ne 3 ft at 4 seconds and se 3 ft at
11 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 4 to
6 ft. 
.thu night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
4 to 6 ft. a chance of showers. 
.fri and fri night...ne winds 25 to 35 kt, becoming n. gusts up
to 45 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807585

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

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


anz235-212100-
rhode island sound-
403 am edt mon sep 21 2026

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

.today...ne winds 20 to 25 kt. seas 2 to 4 ft. wave detail: ne
4 ft at 4 seconds and se 2 ft at 9 seconds. patchy fog this
morning. a chance of showers this morning. 
.tonight...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 1 foot at
5 seconds. 
.tue...ne winds 20 to 25 kt with gusts up to 30 kt. seas 3 to
4 ft. wave detail: n 4 ft at 5 seconds and se 1 foot at
9 seconds. 
.tue night...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
9 seconds. 
.wed and wed night...ne winds 25 to 30 kt with gusts up to 35 kt.
seas 5 to 7 ft. wave detail: se 7 ft at 10 seconds and e 6 ft at
6 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 6 to
9 ft. wave detail: se 8 ft at 12 seconds and n 6 ft at 5 seconds.
.thu night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
5 to 8 ft. a chance of showers. 
.fri and fri night...ne winds 30 to 35 kt with gusts up to 45 kt.
seas 6 to 9 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807588

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

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


anz236-212100-
narragansett bay-
403 am edt mon sep 21 2026

.today...ne winds 15 to 20 kt with gusts up to 25 kt. waves 2 to
3 ft. patchy fog this morning. a slight chance of showers this
morning. 
.tonight...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...ne winds 10 to 15 kt, increasing to 15 to 20 kt
after midnight. gusts up to 25 kt. waves 2 to 3 ft. 
.wed and 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 30 kt. waves 2 to
3 ft, except 4 to 6 ft at the bay entrance. 
.thu night and fri...ne winds 20 to 25 kt with gusts up to 30 kt,
becoming n 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. 
.fri night...n winds 25 to 30 kt with gusts up to 40 kt. waves
around 3 ft, except 4 to 6 ft at the bay entrance. 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807576

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

.today...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 s 1 foot at
4 seconds. patchy fog this morning. a slight chance of showers
this morning. 
.tonight...ne winds 10 to 15 kt, increasing to 15 to 20 kt with
gusts up to 25 kt after midnight. seas 2 to 4 ft. wave detail: ne
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: n 5 ft at 5 seconds and se 2 ft at 12 seconds.
.tue night...ne winds 15 to 20 kt with gusts up to 30 kt. seas
4 to 6 ft. wave detail: e 5 ft at 7 seconds and se 2 ft at
10 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 9 seconds and n 1 foot at 4 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 9 ft. wave detail: e
8 ft at 9 seconds. 
.thu and thu night...ne winds 20 to 25 kt with gusts up to 35 kt.
seas 7 to 10 ft. 
.fri...ne winds 25 to 30 kt with gusts up to 45 kt. seas 9 to
12 ft. a chance of showers. 
.fri night...ne winds 25 to 35 kt with gusts up to 45 kt. seas
10 to 13 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807579

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

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

.today...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 sw 2 ft at 5 seconds.
patchy fog. a chance of showers this morning with vsby 1 to 3 nm.
.tonight...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
5 ft. wave detail: ne 5 ft at 7 seconds and se 2 ft at
15 seconds. 
.tue night...ne winds 15 to 20 kt, increasing to 20 to 25 kt
after midnight. gusts up to 30 kt. seas 5 to 7 ft. wave detail:
ne 7 ft at 7 seconds and e 2 ft at 14 seconds. 
.wed...ne winds 20 to 25 kt with gusts up to 30 kt. seas 5 to
8 ft, building to 7 to 10 ft in the afternoon. wave detail: e
8 ft at 8 seconds and se 4 ft at 11 seconds, becoming e 9 ft at
9 seconds. 
.wed night...ne winds 20 to 25 kt with gusts up to 35 kt. seas
8 to 11 ft. wave detail: e 10 ft at 10 seconds and ne 7 ft at
7 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 9 to
12 ft. 
.thu night...ne winds 25 to 35 kt with gusts up to 40 kt. seas
9 to 13 ft. a chance of showers. 
.fri...ne winds 30 to 35 kt with gusts up to 45 kt. seas 10 to
14 ft. showers likely. 
.fri night...ne winds 30 to 35 kt with gusts up to 45 kt. seas
11 to 15 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.

$$

fzus51 kbox 210803
cwfbox
expires:202609212100;;807580

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
403 am edt mon sep 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-
403 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...

.today...ne winds 20 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 this morning with vsby 1 to 3 nm. 
.tonight...ne winds 15 to 20 kt with gusts up to 25 kt. seas 3 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: n 6 ft at 6 seconds and se 1 foot at
15 seconds. 
.tue night...ne winds 20 to 25 kt with gusts up to 30 kt. seas
5 to 7 ft. wave detail: ne 7 ft at 7 seconds and e 5 ft at
13 seconds. 
.wed...ne winds 25 to 30 kt with gusts up to 35 kt. seas 6 to
9 ft. wave detail: e 8 ft at 8 seconds and n 1 foot at 4 seconds.
.wed night...ne winds 25 to 30 kt with gusts up to 35 kt. seas
8 to 11 ft. wave detail: e 9 ft at 9 seconds and ne 7 ft at
7 seconds. 
.thu...ne winds 25 to 30 kt with gusts up to 35 kt. seas 9 to
12 ft. 
.thu night...ne winds around 30 kt with gusts up to 40 kt. seas
9 to 12 ft. a chance of showers. 
.fri...ne winds 30 to 40 kt with gusts up to 50 kt. seas 9 to
13 ft. showers likely. 
.fri night...ne winds 35 to 40 kt with gusts up to 50 kt. seas
9 to 13 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.

$$