fzus51 kbox 210503
cwfbox
expires:202605211800;;381450

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

.rest of tonight...n winds 5 to 10 kt. seas 1 foot or less. wave
detail: nw 1 foot at 4 seconds and e 1 foot at 17 seconds. a
slight chance of showers. 
.thu...ne winds around 10 kt, becoming e in the afternoon. seas
around 2 ft. wave detail: n 1 foot at 4 seconds and e 1 foot at
15 seconds. 
.thu night...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 14 seconds. 
.fri...ne winds 5 to 10 kt. seas around 2 ft. wave detail: ne
1 foot at 4 seconds and e 1 foot at 14 seconds. 
.fri night...se winds around 5 kt. seas 1 foot or less. wave
detail: ne 1 foot at 3 seconds and e 1 foot at 9 seconds. 
.sat...e winds around 5 kt, increasing to 5 to 10 kt in the
afternoon. seas 1 foot or less. wave detail: ne 1 foot at
3 seconds and se 1 foot at 12 seconds.
.sat night...e winds 5 to 10 kt. seas 1 foot or less, then around
2 ft after midnight. 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 210503
cwfbox
expires:202605211800;;381454

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

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


anz232-211800-
nantucket sound-
103 am edt thu may 21 2026

.rest of tonight...n winds around 10 kt. seas around 2 ft. wave
detail: nw 2 ft at 5 seconds. a chance of showers with a slight
chance of tstms. 
.thu...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 4 seconds and se 1 foot at 14 seconds. a chance of
showers in the morning. 
.thu night...se winds around 5 kt, becoming nw after midnight.
seas around 2 ft. wave detail: e 1 foot at 5 seconds and se
1 foot at 14 seconds. 
.fri...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 5 seconds and se 1 foot at 12 seconds. 
.fri night and sat...e winds 5 to 10 kt. seas around 2 ft. wave
detail: e 1 foot at 4 seconds and se 1 foot at 12 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 3 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 2 to 4 ft. showers.
.mon and mon night...w winds 5 to 10 kt. seas 2 to 3 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.

$$

fzus51 kbox 210503
cwfbox
expires:202605211800;;381455

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

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


anz233-211800-
vineyard sound-
103 am edt thu may 21 2026

.rest of tonight...n winds 5 to 10 kt. seas 2 to 3 ft. wave
detail: sw 3 ft at 7 seconds. a chance of showers with a slight
chance of tstms. 
.thu...ne winds 10 to 15 kt, becoming e 5 to 10 kt in the
afternoon. seas 2 to 3 ft. wave detail: ne 3 ft at 6 seconds. a
chance of showers. 
.thu night...se winds 5 to 10 kt, becoming nw after midnight.
seas around 2 ft. wave detail: sw 2 ft at 6 seconds and se 1 foot
at 14 seconds.
.fri...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 6 seconds and se 1 foot at 14 seconds. 
.fri night and sat...e winds 5 to 10 kt. seas around 2 ft. wave
detail: se 1 foot at 4 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 3 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, 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.  

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 210503
cwfbox
expires:202605211800;;381456

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

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


anz234-211800-
buzzards bay-
103 am edt thu may 21 2026

.rest of tonight...n winds 5 to 10 kt. seas around 2 ft. wave
detail: w 2 ft at 6 seconds. a chance of showers with a slight
chance of tstms. 
.thu...ne winds 10 to 15 kt, becoming e 5 to 10 kt in the
afternoon. seas around 2 ft. wave detail: ne 2 ft at 5 seconds. a
chance of showers in the morning. 
.thu night...se winds 5 to 10 kt, becoming nw after midnight.
seas around 2 ft in the evening, then 1 foot or less. wave
detail: s 1 foot at 6 seconds and se 1 foot at 15 seconds,
becoming sw 1 foot at 6 seconds and se 1 foot at 15 seconds. 
.fri...ne winds 10 to 15 kt. seas around 2 ft. wave detail: ne
1 foot at 6 seconds and se 1 foot at 15 seconds. 
.fri night and sat...e winds 5 to 10 kt. seas around 2 ft. wave
detail: se 1 foot at 3 seconds and se 1 foot at 14 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. 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.  

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 210503
cwfbox
expires:202605211800;;381457

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

.rest of tonight...n winds around 10 kt. seas 2 to 3 ft. wave
detail: sw 3 ft at 7 seconds. a chance of showers with a slight
chance of tstms. 
.thu...ne winds 10 to 15 kt, becoming e in the afternoon. seas
2 to 3 ft. wave detail: ne 3 ft at 7 seconds. a chance of
showers. 
.thu night...se winds 5 to 10 kt, becoming n after midnight. seas
2 to 3 ft. wave detail: s 3 ft at 7 seconds. 
.fri...e winds 10 to 15 kt. seas around 2 ft. wave detail: ne
2 ft at 7 seconds and se 1 foot at 14 seconds. 
.fri night and sat...e winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: se 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. 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.  

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 210503
cwfbox
expires:202605211800;;381460

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

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


anz236-211800-
narragansett bay-
103 am edt thu may 21 2026

.rest of tonight...n winds 5 to 10 kt. waves around 2 ft. a
chance of showers. 
.thu...ne winds around 10 kt, becoming se in the afternoon. waves
around 2 ft. a chance of showers in the morning. 
.thu night...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 and sat...e winds 5 to 10 kt. waves around 2 ft. 
.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 210503
cwfbox
expires:202605211800;;381448

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

.rest of tonight...n winds around 10 kt. seas 2 to 3 ft. wave
detail: nw 3 ft at 5 seconds. a slight chance of showers. 
.thu...n winds around 10 kt, becoming e in the afternoon. seas
2 to 3 ft. wave detail: n 3 ft at 5 seconds. 
.thu night...s winds around 5 kt, becoming n after midnight. seas
around 2 ft. wave detail: ne 2 ft at 6 seconds. 
.fri...ne winds around 10 kt, becoming e in the afternoon. seas
around 2 ft. wave detail: ne 2 ft at 5 seconds and se 1 foot at
14 seconds. 
.fri night...s winds around 5 kt, becoming w around 5 kt after
midnight. seas around 2 ft. wave detail: e 2 ft at 6 seconds and
se 1 foot at 14 seconds. 
.sat...e winds around 5 kt. seas 1 foot or less. wave detail: se
1 foot at 8 seconds and se 1 foot at 11 seconds. 
.sat night...se winds 5 to 10 kt. seas 1 foot or less, then
around 2 ft after midnight. 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 210503
cwfbox
expires:202605211800;;381451

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

...small craft advisory in effect until 2 am edt early this
morning...

.rest of tonight...n winds around 10 kt. seas 2 to 4 ft. wave
detail: nw 3 ft at 7 seconds. a chance of showers with a slight
chance of tstms. 
.thu...ne winds 10 to 15 kt, diminishing to 5 to 10 kt in the
afternoon. seas 2 to 4 ft. wave detail: n 3 ft at 6 seconds and
se 1 foot at 14 seconds. 
.thu night...se winds around 5 kt, becoming nw after midnight.
seas 2 to 3 ft. wave detail: e 3 ft at 6 seconds and se 1 foot at
14 seconds. 
.fri...ne winds 5 to 10 kt. seas around 2 ft. wave detail: ne
2 ft at 6 seconds and se 1 foot at 14 seconds. 
.fri night and sat...e winds 5 to 10 kt. seas around 2 ft. wave
detail: ne 2 ft at 6 seconds and se 1 foot at 14 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 5 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.  

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 210503
cwfbox
expires:202605211800;;381452

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

...small craft advisory in effect until 2 am edt early this
morning...

.rest of tonight...n winds 10 to 15 kt. seas 3 to 4 ft. wave
detail: sw 4 ft at 7 seconds. a chance of showers and tstms. 
.thu...ne winds 10 to 15 kt with gusts up to 20 kt. seas 2 to
4 ft. wave detail: ne 4 ft at 7 seconds. a chance of showers. 
.thu night...e winds 5 to 10 kt, becoming ne after midnight. seas
2 to 3 ft. wave detail: se 3 ft at 6 seconds and se 1 foot at
14 seconds. 
.fri...ne winds 10 to 15 kt with gusts up to 20 kt. seas 2 to
3 ft. wave detail: ne 3 ft at 7 seconds and se 1 foot at
14 seconds. 
.fri night and sat...e winds 10 to 15 kt. seas 2 to 3 ft. wave
detail: e 2 ft at 6 seconds and se 1 foot at 14 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. 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.  

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.

$$