Coastal Waters Forecast
Issued by NWS Boston, MA

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 

000
FZUS51 KBOX 171702
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
101 PM EDT Wed Apr 17 2024

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM

ANZ200-180600-
101 PM EDT Wed Apr 17 2024

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres builds over the waters today, but shifts into the Gulf of
ME this evening. A warm front lifts toward the southern waters on
Thu, while high pres remains planted over the Gulf of ME/Nova
Scotia. The high nudges back in for much of Fri before a cold front
sweeps through late Fri into Sat.

$$

ANZ250-180600-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 2 ft at 8 seconds and N 1 ft at 4 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 8 seconds and N 1 ft at 4 seconds.
.THU...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft
at 4 seconds and SE 2 ft at 8 seconds.
.THU NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 4 seconds and E 2 ft at 12 seconds. Patchy drizzle.
.FRI...E winds 5 to 10 kt, becoming SE 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: E 2 ft at 5 seconds and E
2 ft at 11 seconds.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: SE 3 ft at 4 seconds and E 2 ft at
11 seconds. A chance of showers.
.SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 15 to 20 kt with gusts up
to 25 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.

$$

ANZ251-180600-
Massachusetts Bay and Ipswich Bay-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 9 seconds and NE 1 ft at 3 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 3 seconds and E 2 ft at 9 seconds.
.THU...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 4 seconds and E 2 ft at 8 seconds.
.THU NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 4 seconds and SE 1 ft at 8 seconds. Patchy drizzle.
.FRI...E winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 5 seconds and E 1 ft at 11 seconds.
.FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE
2 ft at 4 seconds. A chance of showers.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 25 kt. Seas around 2 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.

$$

ANZ231-180600-
Cape Cod Bay-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and N 1 ft at 3 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 ft at 3 seconds and N 1 ft at 3 seconds.
.THU...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 ft
at 3 seconds and SE 1 ft at 8 seconds.
.THU NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 ft at 3 seconds and SE 1 ft at 7 seconds. Patchy drizzle.
.FRI...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 6 seconds and E 1 ft at 3 seconds.
.FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SE 1 ft at 3 seconds and
S 1 ft at 4 seconds. A chance of showers.
.SAT...SW winds around 10 kt with gusts up to 20 kt. Seas around
2 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 25 kt. Seas around 2 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.

$$

ANZ254-180600-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...NE winds around 5 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 8 seconds and N 1 ft at 3 seconds.
.TONIGHT...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and N 1 ft at 4 seconds.
.THU...E winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at
7 seconds.
.THU NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: E 2 ft at 4 seconds and S
2 ft at 7 seconds. Patchy drizzle.
.FRI...E winds 10 to 15 kt. Seas around 3 ft. Wave Detail: E 2 ft
at 5 seconds and E 2 ft at 11 seconds.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: SE 4 ft at 5 seconds and E 2 ft at
11 seconds. A chance of showers after midnight.
.SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up
to 25 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.

$$

ANZ255-180600-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 8 seconds and NE 1 ft at 3 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 7 seconds and E 1 ft at 3 seconds. A chance of showers
after midnight.
.THU...E winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: E 3 ft at 3 seconds and SE 2 ft at 7 seconds.
.THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: SE 3 ft at 5 seconds and SE 1 ft at
12 seconds. Patchy drizzle after midnight.
.FRI...E winds around 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 7 seconds and E 1 ft at 4 seconds.
.FRI NIGHT...SE winds around 15 kt, becoming S after midnight.
Gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
7 seconds and E 1 ft at 4 seconds. A chance of showers after
midnight.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 15 to 20 kt with gusts up
to 25 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.

$$

ANZ256-180600-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 8 seconds and E 1 ft at 9 seconds.
.TONIGHT...SE winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and
SE 2 ft at 3 seconds. A chance of showers in the evening, then
showers likely after midnight with vsby 1 to 3 NM.
.THU...E winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: SE 4 ft at 5 seconds and SE 1 ft at
14 seconds. A chance of showers in the morning.
.THU NIGHT...E winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: E 4 ft at 6 seconds and SE 1 ft at
12 seconds. Patchy drizzle after midnight.
.FRI...E winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas 3 to 4 ft. Wave Detail: SE 4 ft at 7 seconds and NE 1 ft at
3 seconds.
.FRI NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt,
becoming SW after midnight. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 7 seconds and E 1 ft at 11 seconds. A chance of showers.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 15 to 20 kt with gusts up
to 25 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.

$$

ANZ232-180600-
Nantucket Sound-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: N 1 ft at 3 seconds and S 1 ft at 7 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 ft at 2 seconds and N 1 ft at 3 seconds.
.THU...E winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: E 2 ft at 3 seconds and SE 1 ft at 7 seconds.
.THU NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: E 2 ft at 3 seconds and S
1 ft at 6 seconds. Patchy drizzle.
.FRI...E winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 5 seconds and E 1 ft at 12 seconds.
.FRI NIGHT...SE winds 10 to 15 kt, becoming S after midnight.
Gusts up to 20 kt. Seas around 2 ft. Wave Detail: S 2 ft at
4 seconds and E 2 ft at 4 seconds. A chance of showers.
.SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 15 to 20 kt with gusts up
to 25 kt. Seas around 2 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.

$$

ANZ233-180600-
Vineyard Sound-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 7 seconds and NE 1 ft at 2 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 ft at 3 seconds and S 1 ft at 7 seconds. A chance of showers
after midnight.
.THU...E winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 6 seconds.
.THU NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: E 2 ft at 3 seconds and
SE 2 ft at 6 seconds. Patchy drizzle after midnight.
.FRI...E winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and E 1 ft at 2 seconds.
.FRI NIGHT...SE winds 10 to 15 kt, becoming S after midnight.
Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and S 1 ft at
3 seconds. A chance of showers.
.SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. A chance of showers.
.SAT NIGHT...W winds around 15 kt with gusts up to 25 kt. Seas
2 to 4 ft.
.SUN AND SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 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.

$$

ANZ234-180600-
Buzzards Bay-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NE 1 ft at 2 seconds and S 1 ft at 7 seconds.
.TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 ft at 2 seconds and E 1 ft at 2 seconds.
.THU...E winds 5 to 10 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: E 2 ft at 3 seconds and S 1 ft at 7 seconds.
.THU NIGHT...E winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 3 seconds and SE 2 ft at 6 seconds. Patchy drizzle
after midnight.
.FRI...E winds around 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and E 1 ft at 2 seconds.
.FRI NIGHT...SE winds around 10 kt, becoming SW after midnight.
Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 ft at
3 seconds. A chance of showers.
.SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 25 kt. Seas around 2 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.

$$

ANZ235-180600-
Rhode Island Sound-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 7 seconds.
.TONIGHT...SE winds 5 to 10 kt. Gusts up to 20 kt after midnight.
Seas around 2 ft. Wave Detail: S 2 ft at 8 seconds and SE 1 ft at
3 seconds. A chance of showers.
.THU...E winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SE 3 ft at 5 seconds and SE 1 ft at
14 seconds. A chance of showers in the morning.
.THU NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and E
2 ft at 4 seconds. Patchy drizzle after midnight.
.FRI...E winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds and NE 1 ft at 3 seconds.
.FRI NIGHT...SE winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and E
1 ft at 3 seconds. A chance of showers.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 25 kt. Seas 2 to 3 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.

$$

ANZ237-180600-
Block Island Sound-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and E 1 ft at 9 seconds.
.TONIGHT...SE winds 5 to 10 kt, increasing to 10 to 15 kt with
gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S
3 ft at 8 seconds and SE 1 ft at 3 seconds. Showers. Vsby 1 to
3 NM after midnight.
.THU...E winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: E 3 ft at 4 seconds and SE 3 ft at 7 seconds.
A chance of showers in the morning.
.THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: E 4 ft at 6 seconds and SE 1 ft at
13 seconds. Patchy drizzle after midnight.
.FRI...E winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds and E 1 ft at 4 seconds.
.FRI NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and E 1 ft at
4 seconds. A chance of showers.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 25 kt. Seas 2 to 3 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.

$$

ANZ230-180600-
Boston Harbor-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...E winds 5 to 10 kt. Waves around 2 ft.
.TONIGHT...SE winds 5 to 10 kt. Waves around 2 ft in the evening,
then 1 foot or less.
.THU...E winds 5 to 10 kt. Waves 1 foot or less.
.THU NIGHT...E winds 5 to 10 kt. Waves 1 foot or less. Patchy
drizzle.
.FRI...E winds 5 to 10 kt, becoming SE 10 to 15 kt in the
afternoon. Waves 1 foot or less, then around 2 ft in the
afternoon.
.FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft. A chance of showers.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 25 kt. Waves around 2 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.

$$

ANZ236-180600-
Narragansett Bay-
101 PM EDT Wed Apr 17 2024

.THIS AFTERNOON...S winds 5 to 10 kt. Waves around 2 ft.
.TONIGHT...SE winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.THU...E winds 5 to 10 kt with gusts up to 20 kt. Waves around
2 ft. A chance of showers in the morning.
.THU NIGHT...E winds 5 to 10 kt. Waves 2 to 3 ft. Patchy drizzle
after midnight.
.FRI...E winds 5 to 10 kt. Waves 2 to 3 ft.
.FRI NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Waves 2 to 3 ft. A chance of showers.
.SAT...W winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A chance of showers.
.SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Waves 2 to 3 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.

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston
USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.