Coastal Waters Forecast
Issued by NWS Boston, MA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
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 270502
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
101 AM EDT Wed Mar 27 2024

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

ANZ200-271800-
101 AM EDT Wed Mar 27 2024

.Synopsis for Massachusetts and Rhode Island coastal waters...
Low pressure well south of New England and strong high pressure over
southeast Quebec, will continue to generate NE gales over the MA/RI
waters, along with very large/dangerous seas across the ocean
waters. Both of these features weaken on Wednesday, resulting in
light winds and slowly subsiding seas. Thursday, developing low
pressure emerges off the Mid Atlantic coast, possibly intensifying
into a gale center Friday, as it tracks southeast of the 40N/70W
benchmark. NW gales may follow later Friday into Saturday across the
MA/RI waters. Winds should diminish Sunday as high pressure builds
into New England.

$$

ANZ250-271800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
101 AM EDT Wed Mar 27 2024

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...NE winds 10 to 15 kt. Seas 7 to 9 ft. Patchy
fog. A slight chance of rain with patchy drizzle. Vsby 1 NM or
less.
.WED...N winds 5 to 10 kt. Seas 5 to 8 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less.
.WED NIGHT...NE winds around 5 kt. Seas 4 to 6 ft. Patchy fog. A
chance of rain after midnight. Vsby 1 to 3 NM.
.THU...N winds around 5 kt. Seas 4 to 6 ft. Patchy fog. Rain.
Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 5 to 7 ft. Rain. Patchy fog in
the evening. Vsby 1 to 3 NM.
.FRI...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
7 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 35 kt. Seas
5 to 7 ft. A chance of rain in the evening.
.SAT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to
7 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 10 to 15 kt with gusts up
to 25 kt. Seas 3 to 5 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.

$$

ANZ251-271800-
Massachusetts Bay and Ipswich Bay-
101 AM EDT Wed Mar 27 2024

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...NE winds 10 to 15 kt. Seas 6 to 8 ft. Patchy
fog. A slight chance of rain with patchy drizzle. Vsby 1 NM or
less.
.WED...N winds 5 to 10 kt. Seas 5 to 7 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less, increasing to 1 to
3 NM in the afternoon.
.WED NIGHT...NE winds around 5 kt. Seas 3 to 5 ft. Patchy fog
after midnight. A chance of rain after midnight with vsby 1 to
3 NM.
.THU...N winds around 5 kt. Seas 3 to 4 ft. Patchy fog. Rain
likely. Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, becoming NW 20 to 25 kt after
midnight. Seas 3 to 5 ft. Rain. Patchy fog in the evening. Vsby
1 to 3 NM.
.FRI...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to
5 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 30 kt. Seas
4 to 5 ft. A chance of rain in the evening.
.SAT...W winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW 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.

$$

ANZ231-271800-
Cape Cod Bay-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 3 to 5 ft. Patchy
fog. Patchy drizzle with a slight chance of rain. Vsby 1 NM or
less.
.WED...N winds 5 to 10 kt. Seas 3 to 5 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less.
.WED NIGHT...N winds around 5 kt. Seas 2 to 3 ft. Patchy fog. A
chance of rain after midnight with vsby 1 to 3 NM.
.THU...N winds around 5 kt. Seas 2 to 3 ft. Patchy fog. Rain.
Vsby 1 to 3 NM.
.THU NIGHT...N winds 5 to 10 kt, increasing to 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 3 to 5 ft. Rain. Patchy fog in
the evening. Vsby 1 to 3 NM.
.FRI...NW winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Seas 3 to 5 ft. Rain likely, mainly
in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 35 kt. Seas
3 to 5 ft. A chance of rain in the evening.
.SAT...W winds 15 to 20 kt with gusts up to 35 kt. Seas 3 to
5 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW 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.

$$

ANZ254-271800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
101 AM EDT Wed Mar 27 2024

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 6 to 9 ft. Patchy
fog. Patchy drizzle with a slight chance of rain. Vsby 1 NM or
less.
.WED...N winds around 5 kt. Seas 5 to 8 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less.
.WED NIGHT...NE winds around 5 kt. Seas 5 to 6 ft. Patchy fog. A
chance of rain after midnight. Vsby 1 NM or less, increasing to
1 to 3 NM after midnight.
.THU...N winds 5 to 10 kt. Seas 4 to 6 ft. Patchy fog. Rain. Vsby
1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 5 to 7 ft. Rain. Patchy
fog in the evening. Vsby 1 to 3 NM.
.FRI...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
8 ft. Rain, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 35 kt. Seas
6 to 8 ft. A chance of rain in the evening.
.SAT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to
7 ft.
.SAT NIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Seas
4 to 6 ft.
.SUN AND SUN NIGHT...NW winds around 15 kt with gusts up to
25 kt. Seas 3 to 5 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.

$$

ANZ255-271800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
101 AM EDT Wed Mar 27 2024

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 5 to 7 ft. Patchy
fog. Patchy drizzle. Vsby 1 NM or less.
.WED...N winds 5 to 10 kt. Seas 5 to 7 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less.
.WED NIGHT...NE winds around 5 kt. Seas 4 to 6 ft. Patchy fog. A
chance of rain after midnight. Vsby 1 to 3 NM.
.THU...N winds 5 to 10 kt. Seas 3 to 5 ft. Patchy fog. Rain. Vsby
1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt,
increasing to 20 to 25 kt with gusts up to 30 kt after midnight.
Seas 5 to 7 ft. Rain. Patchy fog in the evening. Vsby 1 to 3 NM.
.FRI...NW winds 25 to 30 kt, diminishing to 20 to 25 kt in the
afternoon. Seas 5 to 7 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 35 kt. Seas
5 to 7 ft.
.SAT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to
7 ft.
.SAT NIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Seas
4 to 6 ft.
.SUN AND SUN NIGHT...NW winds around 15 kt with gusts up to
25 kt. Seas 3 to 5 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.

$$

ANZ256-271800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
101 AM EDT Wed Mar 27 2024

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. Patchy
fog. Patchy drizzle. Vsby 1 NM or less.
.WED...N winds 5 to 10 kt. Seas 4 to 6 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less.
.WED NIGHT...N winds around 5 kt. Seas 4 to 5 ft. Patchy fog
after midnight. A chance of rain after midnight with vsby 1 to
3 NM.
.THU...N winds 5 to 10 kt. Seas 4 to 5 ft. Patchy fog. Rain. Vsby
1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt,
increasing to 20 to 25 kt with gusts up to 30 kt after midnight.
Seas 4 to 6 ft. Rain. Patchy fog in the evening. Vsby 1 to 3 NM.
.FRI...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
6 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 30 kt. Seas
5 to 6 ft.
.SAT...W winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to
6 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up
to 30 kt. Seas 3 to 5 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.

$$

ANZ232-271800-
Nantucket Sound-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 2 to 4 ft. Patchy
fog. Patchy drizzle. Vsby 1 NM or less.
.WED...N winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. Patchy
drizzle in the morning. Vsby 1 NM or less.
.WED NIGHT...NE winds around 5 kt. Seas 2 to 3 ft. Patchy fog. A
chance of rain after midnight with vsby 1 to 3 NM.
.THU...N winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Rain. Vsby
1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 20 to 25 kt after
midnight. Seas 2 to 4 ft. Rain. Patchy fog in the evening. Vsby
1 to 3 NM.
.FRI...NW winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Seas 3 to 4 ft. Rain likely, mainly
in the morning.
.FRI NIGHT...NW winds around 20 kt with gusts up to 30 kt. Seas
3 to 4 ft. A chance of rain in the evening.
.SAT AND SAT NIGHT...W winds 15 to 20 kt, diminishing to 10 to
15 kt. Gusts up to 30 kt. Seas 2 to 4 ft.
.SUN AND SUN NIGHT...NW 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.

$$

ANZ233-271800-
Vineyard Sound-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Patchy
fog. Patchy drizzle. Vsby 1 NM or less.
.WED...NE winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Patchy
drizzle in the morning with vsby 1 NM or less.
.WED NIGHT...N winds around 5 kt. Seas around 2 ft. Patchy fog
after midnight. A chance of rain after midnight with vsby 1 to
3 NM.
.THU...N winds around 5 kt. Seas around 2 ft. Patchy fog. Rain.
Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 20 to 25 kt after
midnight. Seas 2 to 3 ft. Rain. Patchy fog in the evening. Vsby
1 to 3 NM.
.FRI...NW winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 2 to 3 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 30 kt. Seas
3 to 4 ft.
.SAT AND SAT NIGHT...W winds 15 to 20 kt, diminishing to 10 to
15 kt. Gusts up to 30 kt. Seas 2 to 4 ft.
.SUN AND SUN NIGHT...NW 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.

$$

ANZ234-271800-
Buzzards Bay-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Patchy
fog. Patchy drizzle. Vsby 1 NM or less.
.WED...N winds 5 to 10 kt. Seas around 2 ft. Patchy fog in the
morning. Patchy drizzle in the morning with vsby 1 NM or less.
.WED NIGHT...NE winds around 5 kt. Seas around 2 ft. Patchy fog
after midnight. A chance of rain after midnight with vsby 1 to
3 NM.
.THU...N winds around 5 kt. Seas around 2 ft. Patchy fog. Rain.
Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 20 to 25 kt after
midnight. Seas 2 to 3 ft. Rain. Patchy fog in the evening. Vsby
1 to 3 NM.
.FRI...NW winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 2 to 3 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds around 20 kt with gusts up to 30 kt. Seas
around 3 ft.
.SAT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up to
30 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.

$$

ANZ235-271800-
Rhode Island Sound-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Patchy
fog. Patchy drizzle. Vsby 1 NM or less.
.WED...N winds 5 to 10 kt. Seas 3 to 4 ft. Patchy fog in the
morning. Patchy drizzle in the morning with vsby 1 NM or less.
.WED NIGHT...N winds around 5 kt. Seas around 3 ft. Patchy fog
after midnight. A chance of rain after midnight with vsby 1 to
3 NM.
.THU...N winds around 5 kt. Seas 2 to 3 ft. Patchy fog. Rain.
Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 20 to 25 kt after
midnight. Seas 3 to 4 ft. Rain. Patchy fog in the evening. Vsby
1 to 3 NM.
.FRI...NW winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas around 4 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 30 kt. Seas
4 to 5 ft.
.SAT...W winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft.
.SAT NIGHT THROUGH SUN NIGHT...NW winds 10 to 15 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.

$$

ANZ237-271800-
Block Island Sound-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Patchy
fog. Patchy drizzle. Vsby 1 to 3 NM.
.WED...N winds 5 to 10 kt. Seas 3 to 4 ft. Patchy fog in the
morning. Patchy drizzle in the morning with vsby 1 NM or less.
.WED NIGHT...NW winds around 5 kt. Seas 2 to 3 ft. Patchy fog
after midnight. Rain likely after midnight with vsby 1 to 3 NM.
.THU...NW winds around 5 kt. Seas 2 to 3 ft. Patchy fog. Rain
likely. Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 3 to 4 ft. Rain. Patchy fog in the evening. Vsby
1 to 3 NM.
.FRI...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. A chance of rain in the morning.
.FRI NIGHT...NW winds around 20 kt with gusts up to 30 kt. Seas
3 to 5 ft.
.SAT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up to
30 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.

$$

ANZ230-271800-
Boston Harbor-
101 AM EDT Wed Mar 27 2024

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 9 AM EDT THIS MORNING...

.REST OF TONIGHT...N winds 5 to 10 kt. Waves 2 to 3 ft. Patchy
fog. A slight chance of rain with patchy drizzle. Vsby 1 NM or
less.
.WED...N winds 5 to 10 kt, becoming NE in the afternoon. Waves
1 foot or less, except 3 to 5 ft at the outer harbor entrance.
Patchy fog. Patchy drizzle in the morning with vsby 1 NM or less.
.WED NIGHT...NE winds around 5 kt. Waves 1 foot or less, except
2 to 4 ft at the outer harbor entrance. A chance of rain. Patchy
fog after midnight with vsby 1 to 3 NM.
.THU...N winds around 5 kt. Waves around 2 ft in the morning,
then 1 foot or less. Patchy fog. Rain likely. Vsby 1 to 3 NM.
.THU NIGHT...N winds 15 to 20 kt, becoming NW 20 to 25 kt with
gusts up to 30 kt after midnight. Waves around 2 ft. Rain. Patchy
fog in the evening. Vsby 1 to 3 NM.
.FRI...NW winds 20 to 25 kt with gusts up to 30 kt. Waves around
2 ft. Rain likely, mainly in the morning.
.FRI NIGHT...NW winds 20 to 25 kt with gusts up to 30 kt. Waves
around 2 ft.
.SAT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up to
30 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.

$$

ANZ236-271800-
Narragansett Bay-
101 AM EDT Wed Mar 27 2024

.REST OF TONIGHT...N winds 5 to 10 kt. Waves 2 to 3 ft. Patchy
fog. Patchy drizzle. Vsby 1 to 3 NM.
.WED...NE winds around 5 kt. Waves 2 to 3 ft. Patchy fog in the
morning. Patchy drizzle in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds around 5 kt, becoming NE around 5 kt after
midnight. Waves 2 to 3 ft. Patchy fog after midnight. A chance of
rain after midnight with vsby 1 to 3 NM.
.THU...N winds around 5 kt. Waves 2 to 3 ft. Patchy fog. Rain
likely. Vsby 1 to 3 NM.
.THU NIGHT...N winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Gusts up to 25 kt. Waves 2 to 3 ft. Rain. Patchy fog in
the evening. Vsby 1 to 3 NM.
.FRI...NW winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to
3 ft. A chance of rain.
.FRI NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Waves
around 3 ft.
.SAT THROUGH SUN NIGHT...NW winds 15 to 20 kt with gusts up to
25 kt. Waves 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.

$$

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.