fzus51 kbox 210503
cwfbox
expires:202609211800;;799148

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


anz237-211800-
block 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...ne 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 1 foot
at 10 seconds. patchy fog. showers likely. vsby 1 to 3 nm. 
.mon...ne winds 15 to 20 kt with gusts up to 25 kt. seas 3 to
4 ft. wave detail: ne 3 ft at 5 seconds and se 2 ft at 9 seconds.
a chance of showers in the morning. 
.mon night...ne winds 15 to 20 kt with gusts up to 25 kt. seas
3 to 4 ft. wave detail: ne 3 ft at 5 seconds and sw 1 foot at
5 seconds. 
.tue...ne winds 15 to 20 kt with gusts up to 30 kt. seas 3 to
5 ft. wave detail: ne 5 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
4 to 6 ft. wave detail: ne 6 ft at 5 seconds and se 1 foot at
13 seconds. 
.wed...ne winds 25 to 30 kt with gusts up to 35 kt. seas 5 to
8 ft. wave detail: e 7 ft at 7 seconds. 
.wed night...ne winds 20 to 25 kt with gusts up to 35 kt. seas
6 to 9 ft. 
.thu...ne winds 25 to 30 kt with gusts up to 40 kt. seas 7 to
10 ft. 
.thu night and fri...ne winds 25 to 30 kt with gusts up to 40 kt.
seas 6 to 9 ft. a chance of showers. 
.fri night...ne winds 25 to 30 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;;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.

$$