fzus51 kbox 212004
cwfbox
expires:202607220900;;367084

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz231-220900-
cape cod bay-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 15 to 20 kt with gusts up to 30 kt. seas 3 to
4 ft. wave detail: s 3 ft at 5 seconds and e 1 foot at
12 seconds. showers with a chance of tstms. patchy fog after
midnight. 
.wed...sw winds 15 to 20 kt with gusts up to 30 kt. seas 3 to
4 ft. wave detail: sw 3 ft at 4 seconds and se 1 foot at
7 seconds. a chance of showers. patchy fog in the morning with
vsby 1 to 3 nm. 
.wed night...sw winds 10 to 15 kt with gusts up to 25 kt,
becoming w 5 to 10 kt after midnight. seas 2 to 4 ft. wave
detail: s 3 ft at 4 seconds and se 3 ft at 10 seconds. a chance
of showers in the evening. 
.thu...nw winds 5 to 10 kt, becoming ne in the afternoon. seas
around 2 ft. wave detail: se 2 ft at 5 seconds and nw 1 foot at
2 seconds. a chance of showers in the morning. 
.thu night...se winds around 5 kt, becoming w after midnight.
seas around 2 ft in the evening, then 1 foot or less. wave
detail: se 2 ft at 7 seconds and w 1 foot at 3 seconds, becoming
sw 1 foot at 2 seconds and s 1 foot at 8 seconds. 
.fri and fri night...e winds around 5 kt. seas 1 foot or less.
wave detail: w 1 foot at 2 seconds and se 1 foot at 7 seconds. 
.sat through sun night...s winds 5 to 10 kt. seas 1 foot or less.
 

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367088

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz232-220900-
nantucket sound-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 20 to 25 kt, becoming sw 25 to 30 kt after
midnight. seas 3 to 4 ft, building to 4 to 6 ft after midnight.
wave detail: se 4 ft at 6 seconds and sw 1 foot at 6 seconds,
becoming s 5 ft at 6 seconds and e 1 foot at 11 seconds. showers
with a chance of tstms. patchy fog after midnight. 
.wed...sw winds 25 to 30 kt, diminishing to 20 to 25 kt in the
afternoon. seas 4 to 6 ft. wave detail: s 5 ft at 7 seconds and
sw 3 ft at 4 seconds. showers likely in the morning. a chance of
showers in the afternoon. patchy fog in the morning with vsby
1 to 3 nm. 
.wed night...sw winds 20 to 25 kt with gusts up to 30 kt,
becoming w 10 to 15 kt with gusts up to 20 kt after midnight.
seas 3 to 5 ft. wave detail: sw 4 ft at 8 seconds and se 4 ft at
9 seconds. a chance of showers. patchy fog in the evening with
vsby 1 to 3 nm. 
.thu...n winds around 10 kt, becoming ne in the afternoon. seas
2 to 4 ft. wave detail: s 2 ft at 8 seconds and e 2 ft at
10 seconds. a chance of showers in the morning. 
.thu night...e winds 5 to 10 kt, becoming ne after midnight. seas
2 to 3 ft. wave detail: sw 1 foot at 6 seconds and e 1 foot at
7 seconds. 
.fri and fri night...e winds 5 to 10 kt. seas around 2 ft. wave
detail: sw 1 foot at 4 seconds and s 1 foot at 7 seconds. 
.sat through sun night...s winds 5 to 10 kt. seas around 2 ft.  

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367089

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz233-220900-
vineyard sound-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 20 to 25 kt with gusts up to 30 kt. seas 3 to
5 ft, building to 5 to 7 ft after midnight. wave detail: s 5 ft
at 7 seconds, becoming s 7 ft at 7 seconds and e 1 foot at
11 seconds. a chance of tstms. showers this evening, then showers
likely after midnight. patchy fog after midnight. 
.wed...sw winds 20 to 25 kt with gusts up to 30 kt. seas 5 to
7 ft. wave detail: sw 7 ft at 8 seconds and sw 3 ft at 5 seconds.
showers likely in the morning. a chance of showers in the
afternoon. patchy fog in the morning with vsby 1 to 3 nm. 
.wed night...sw winds 15 to 20 kt with gusts up to 25 kt,
becoming nw 5 to 10 kt after midnight. seas 4 to 6 ft. wave
detail: sw 6 ft at 9 seconds and se 4 ft at 9 seconds. a chance
of showers. patchy fog in the evening with vsby 1 to 3 nm. 
.thu...n winds 5 to 10 kt, becoming e in the afternoon. seas 2 to
4 ft. wave detail: sw 4 ft at 9 seconds and e 2 ft at 8 seconds.
a chance of showers in the morning. 
.thu night through fri night...e winds 5 to 10 kt. seas 2 to
3 ft. wave detail: sw 3 ft at 8 seconds and se 1 foot at
7 seconds. 
.sat through sun night...sw winds 5 to 10 kt. seas around 2 ft.
wave detail: e 2 ft at 7 seconds and sw 1 foot at 6 seconds.  

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367090

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz234-220900-
buzzards bay-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 20 to 25 kt with gusts up to 30 kt. seas 3 to
5 ft. wave detail: s 5 ft at 5 seconds. showers with a chance of
tstms this evening, then showers likely with a slight chance of
tstms after midnight. patchy fog after midnight. 
.wed...sw winds 20 to 25 kt with gusts up to 30 kt. seas 3 to
5 ft. wave detail: sw 5 ft at 6 seconds. a chance of showers.
patchy fog in the morning with vsby 1 to 3 nm. 
.wed night...sw winds 15 to 20 kt with gusts up to 25 kt,
becoming nw 5 to 10 kt after midnight. seas 3 to 5 ft. wave
detail: sw 4 ft at 9 seconds and sw 3 ft at 4 seconds. a chance
of showers. patchy fog in the evening with vsby 1 to 3 nm. 
.thu...n winds 5 to 10 kt, becoming e in the afternoon. seas 2 to
3 ft. wave detail: e 3 ft at 9 seconds and sw 2 ft at 9 seconds.
a chance of showers in the morning. 
.thu night...se winds 5 to 10 kt, becoming sw after midnight.
seas around 2 ft. wave detail: sw 2 ft at 8 seconds and se 2 ft
at 8 seconds. 
.fri and fri night...e winds 5 to 10 kt. seas around 2 ft. wave
detail: sw 1 foot at 4 seconds and s 1 foot at 7 seconds. 
.sat through sun night...sw winds 5 to 10 kt. seas around 2 ft.  

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367091

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz235-220900-
rhode island sound-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 20 to 25 kt with gusts up to 30 kt. seas 4 to
6 ft, building to 5 to 8 ft after midnight. wave detail: s 6 ft
at 7 seconds, becoming sw 8 ft at 7 seconds and se 4 ft at
8 seconds. showers with a chance of tstms. patchy fog after
midnight. 
.wed...sw winds 20 to 25 kt with gusts up to 30 kt. seas 5 to
8 ft. wave detail: s 8 ft at 8 seconds and se 4 ft at 7 seconds.
a chance of showers. patchy fog in the morning with vsby 1 to
3 nm. 
.wed night...sw winds 15 to 20 kt with gusts up to 25 kt,
becoming nw around 10 kt after midnight. seas 5 to 7 ft. wave
detail: s 7 ft at 9 seconds and se 4 ft at 9 seconds. a chance of
showers. patchy fog in the evening with vsby 1 to 3 nm. 
.thu...n winds 5 to 10 kt, becoming e in the afternoon. seas 4 to
6 ft. wave detail: s 6 ft at 9 seconds and e 4 ft at 10 seconds.
a chance of showers in the morning. 
.thu night...s winds 5 to 10 kt, becoming nw after midnight. seas
3 to 4 ft. wave detail: s 4 ft at 8 seconds and se 3 ft at
7 seconds. 
.fri and fri night...e winds 5 to 10 kt. seas 2 to 4 ft. wave
detail: se 4 ft at 7 seconds and w 1 foot at 7 seconds. 
.sat through sun night...sw winds 5 to 10 kt. seas 2 to 3 ft.  

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367094

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz236-220900-
narragansett bay-
404 pm edt tue jul 21 2026

.tonight...s winds 15 to 20 kt with gusts up to 25 kt. waves 3 to
5 ft. a chance of tstms. showers this evening, then a chance of
showers after midnight. patchy fog after midnight. 
.wed...sw winds 15 to 20 kt with gusts up to 25 kt. waves 3 to
5 ft. a chance of showers. patchy fog in the morning with vsby
1 to 3 nm. 
.wed night...sw winds 10 to 15 kt with gusts up to 20 kt,
becoming nw 5 to 10 kt after midnight. waves 2 to 4 ft. a chance
of showers in the evening. 
.thu...n winds 5 to 10 kt, becoming ne in the afternoon. waves
2 to 3 ft. 
.thu night...s winds 5 to 10 kt, becoming nw after midnight.
waves 2 to 3 ft. 
.fri and fri night...ne winds 5 to 10 kt. waves around 2 ft. 
.sat through sun night...sw winds 5 to 10 kt. waves around 2 ft. 

winds and waves 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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367082

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz250-220900-
coastal waters east of ipswich bay and the stellwagen bank
national marine sanctuary-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 15 to 20 kt with gusts up to 30 kt. seas 3 to
5 ft. wave detail: s 4 ft at 6 seconds and e 1 foot at
11 seconds. showers with a chance of tstms this evening, then a
chance of showers with a slight chance of tstms after midnight.
patchy fog after midnight. 
.wed...s winds 15 to 20 kt with gusts up to 30 kt. seas 3 to
5 ft. wave detail: s 5 ft at 8 seconds and se 5 ft at 8 seconds.
patchy fog in the morning. a chance of showers in the morning
with vsby 1 nm or less. 
.wed night...sw winds 10 to 15 kt with gusts up to 25 kt,
becoming w after midnight. seas 3 to 5 ft. wave detail: s 5 ft at
8 seconds and se 4 ft at 10 seconds. 
.thu...nw winds 5 to 10 kt, becoming se in the afternoon. seas
2 to 4 ft. wave detail: se 3 ft at 8 seconds and e 2 ft at
10 seconds. 
.thu night...s winds around 5 kt, becoming sw after midnight.
seas 2 to 3 ft. wave detail: se 3 ft at 8 seconds and nw 1 foot
at 3 seconds. 
.fri and fri night...s winds around 5 kt. seas 2 to 3 ft. wave
detail: se 2 ft at 7 seconds and s 1 foot at 2 seconds. 
.sat through sun night...s winds 5 to 10 kt. seas 2 to 3 ft.  

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367085

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz254-220900-
coastal waters from provincetown ma to chatham ma to nantucket ma
out 20 nm-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 15 to 20 kt, increasing to 20 to 25 kt after
midnight. gusts up to 30 kt. seas 3 to 5 ft, building to 5 to
7 ft after midnight. wave detail: s 5 ft at 5 seconds and se
1 foot at 8 seconds, becoming s 7 ft at 6 seconds and e 1 foot at
11 seconds. showers. a slight chance of tstms this evening, then
a chance of tstms after midnight. patchy fog after midnight. 
.wed...s winds 20 to 25 kt with gusts up to 30 kt. seas 6 to
9 ft. wave detail: sw 8 ft at 6 seconds and se 5 ft at 9 seconds.
patchy fog. showers likely in the morning. a chance of showers in
the afternoon. vsby 1 nm or less in the morning. 
.wed night...sw winds 15 to 20 kt with gusts up to 30 kt,
becoming w 10 to 15 kt with gusts up to 20 kt after midnight.
seas 5 to 8 ft. wave detail: s 8 ft at 9 seconds and se 5 ft at
10 seconds. patchy fog. a chance of showers. vsby 1 nm or less,
increasing to 1 to 3 nm after midnight. 
.thu...nw winds around 10 kt, becoming ne in the afternoon. seas
4 to 6 ft. wave detail: se 5 ft at 9 seconds and e 2 ft at
10 seconds. a chance of showers. 
.thu night...e winds around 5 kt, becoming n after midnight. seas
3 to 5 ft. wave detail: s 4 ft at 8 seconds and se 2 ft at
8 seconds. 
.fri and fri night...e winds 5 to 10 kt. seas 2 to 4 ft. wave
detail: se 3 ft at 7 seconds and w 1 foot at 3 seconds. 
.sat through sun night...s winds 5 to 10 kt. seas 2 to 3 ft.  

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.

$$

fzus51 kbox 212004
cwfbox
expires:202607220900;;367086

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
404 pm edt tue jul 21 2026

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


anz255-220900-
coastal waters extending out to 25 nm south of marthas vineyard
and nantucket-
404 pm edt tue jul 21 2026

...small craft advisory in effect from 8 pm edt this evening
through wednesday evening...

.tonight...s winds 20 to 25 kt with gusts up to 30 kt. seas 4 to
6 ft, building to 6 to 9 ft after midnight. wave detail: se 6 ft
at 7 seconds and w 1 foot at 7 seconds, becoming s 9 ft at
7 seconds and w 3 ft at 7 seconds. showers. a slight chance of
tstms this evening, then a chance of tstms after midnight. patchy
fog after midnight. 
.wed...sw winds 20 to 25 kt with gusts up to 30 kt. seas 7 to
10 ft. wave detail: w 9 ft at 7 seconds and e 1 foot at
8 seconds. patchy fog. showers likely with a chance of tstms in
the morning, then a chance of showers in the afternoon. vsby 1 nm
or less in the morning. 
.wed night...sw winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. gusts up to 25 kt. seas 6 to 9 ft. wave detail: s
9 ft at 9 seconds and se 3 ft at 10 seconds. patchy fog. a chance
of showers in the evening. showers likely after midnight. vsby
1 to 3 nm in the evening. 
.thu...n winds around 10 kt, becoming ne in the afternoon. seas
5 to 7 ft. wave detail: s 6 ft at 9 seconds and e 2 ft at
11 seconds. showers likely, mainly in the morning. patchy fog in
the morning. 
.thu night and fri...e winds 5 to 10 kt. seas 3 to 5 ft. wave
detail: s 5 ft at 8 seconds and se 2 ft at 7 seconds. 
.fri night...e winds 5 to 10 kt. seas 2 to 3 ft. wave detail: se
3 ft at 7 seconds and nw 1 foot at 6 seconds. 
.sat through sun night...s winds 5 to 10 kt. seas 2 to 3 ft.  

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.

$$