fzus51 kbox 212305
cwfbox
expires:202605221200;;424401

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

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


anz230-221200-
boston harbor-
705 pm edt thu may 21 2026

.tonight...se winds around 5 kt, becoming n after midnight. waves
1 foot or less. 
.fri...ne winds around 10 kt, becoming e in the afternoon. waves
1 foot or less, then around 2 ft in the afternoon. 
.fri night...se winds 5 to 10 kt, becoming s after midnight.
waves 1 foot or less. 
.sat...e winds 5 to 10 kt. waves 1 foot or less. 
.sat night through sun night...e winds 15 to 20 kt with gusts up
to 25 kt. waves 2 to 3 ft. showers.
.mon...n winds 5 to 10 kt. waves 1 foot or less. a chance of
showers. 
.mon night through tue night...sw winds 5 to 10 kt. waves 1 foot
or less.  

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 212305
cwfbox
expires:202605221200;;424390

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

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


anz250-221200-
coastal waters east of ipswich bay and the stellwagen bank
national marine sanctuary-
705 pm edt thu may 21 2026

.tonight...s winds around 5 kt, becoming n after midnight. seas
around 2 ft. wave detail: n 2 ft at 4 seconds and se 1 foot at
9 seconds. 
.fri...ne winds 5 to 10 kt. seas around 2 ft. wave detail: ne
2 ft at 4 seconds and nw 1 foot at 3 seconds. 
.fri night...s winds around 5 kt. seas around 2 ft in the
evening, then 1 foot or less. wave detail: nw 2 ft at 3 seconds
and ne 1 foot at 4 seconds, becoming w 1 foot at 2 seconds and ne
1 foot at 4 seconds. 
.sat...e winds around 5 kt. seas 1 foot or less. wave detail: n
1 foot at 3 seconds and se 1 foot at 10 seconds. 
.sat night...se winds 5 to 10 kt. seas 1 foot or less, then
around 2 ft after midnight. wave detail: e 1 foot at 3 seconds
and se 1 foot at 10 seconds, becoming se 2 ft at 9 seconds and ne
1 foot at 3 seconds. a chance of showers after midnight. 
.sun...e winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. gusts up to 25 kt. seas 2 to 4 ft. wave detail: se
4 ft at 5 seconds and sw 1 foot at 4 seconds. showers.
.sun night...e winds 15 to 20 kt with gusts up to 25 kt. seas
3 to 5 ft. showers.
.mon...ne winds 10 to 15 kt with gusts up to 20 kt. seas 4 to
6 ft. showers likely. 
.mon night...n winds 5 to 10 kt. seas 4 to 6 ft. 
.tue and tue night...sw winds 5 to 10 kt. seas 2 to 4 ft.  

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.

$$