234
FZUS51 KBOX 202105
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
404 PM EST Thu Nov 20 2025

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

ANZ200-211000-
404 PM EST Thu Nov 20 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres will move S of the waters Fri. A cold front will approach
the waters from the Great Lakes Fri night before moving offshore
Sat. High pres will build back over the waters early next week.

$$

ANZ250-211000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming W around 5 kt after
midnight. Seas 1 foot or less. Wave Detail: NE 1 foot at
4 seconds and S 1 foot at 8 seconds.
.FRI...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 7 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at
7 seconds. Patchy fog after midnight.
.SAT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: NW 3 ft at 4 seconds and E 2 ft at 7 seconds.
Patchy fog in the morning.
.SAT NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Seas 3 to 4 ft. Wave Detail: NE 3 ft at
6 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 6 seconds and W 2 ft at
3 seconds.
.MON THROUGH TUE...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. A chance of rain.

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.

$$

ANZ251-211000-
Massachusetts Bay and Ipswich Bay-
404 PM EST Thu Nov 20 2025

.TONIGHT...E winds around 5 kt, becoming W around 5 kt after
midnight. Seas 1 foot or less. Wave Detail: NE 1 foot at
4 seconds and S 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 3 seconds and NE 1 foot at 3 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at
7 seconds. Patchy fog after midnight.
.SAT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 4 seconds and E 2 ft at 7 seconds.
Patchy fog in the morning.
.SAT NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E
2 ft at 7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: NE 2 ft at 7 seconds and NW 1 foot at 3 seconds.
.MON THROUGH TUE...SW winds 10 to 15 kt. Seas around 2 ft.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Rain likely.

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.

$$

ANZ231-211000-
Cape Cod Bay-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming W around 5 kt after
midnight. Seas 1 foot or less. Wave Detail: N 1 foot at 3 seconds
and S 1 foot at 8 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW
1 foot at 2 seconds and NE 1 foot at 4 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: SW 1 foot at 3 seconds and E 1 foot at 7 seconds. Patchy
fog after midnight. A chance of showers after midnight.
.SAT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 7 seconds.
Patchy fog in the morning. A chance of rain in the morning.
.SAT NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 5 seconds and E 1 foot at
7 seconds.
.SUN AND SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 5 seconds and SE 1 foot at 7 seconds.
.MON THROUGH TUE...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. A chance of rain.

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.

$$

ANZ254-211000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds 5 to 10 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: NE 2 ft at 4 seconds and S 2 ft at
8 seconds.
.FRI...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 3 seconds and SE 2 ft at 7 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at
7 seconds. Patchy fog after midnight. A chance of showers after
midnight with vsby 1 to 3 NM.
.SAT...NW winds 10 to 15 kt, becoming N 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: N 3 ft
at 4 seconds and E 3 ft at 7 seconds. Patchy fog in the morning.
A chance of rain in the morning with vsby 1 to 3 NM.
.SAT NIGHT...N winds 15 to 20 kt, becoming NW 10 to 15 kt after
midnight. Seas 3 to 5 ft. Wave Detail: N 3 ft at 6 seconds and SE
3 ft at 7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft. Wave
Detail: NE 3 ft at 7 seconds and S 3 ft at 8 seconds.
.MON THROUGH TUE...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft.
.TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 4 ft. A chance of
rain.

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.

$$

ANZ255-211000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds 5 to 10 kt, becoming N after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 7 seconds and N 1 foot at
3 seconds.
.FRI...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at
5 seconds and E 1 foot at 4 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft. Wave Detail: SW 3 ft at 5 seconds and E 2 ft at
7 seconds. Patchy fog after midnight. A chance of showers after
midnight with vsby 1 to 3 NM.
.SAT...NW winds 10 to 15 kt, becoming N 15 to 20 kt in the
afternoon. Seas 3 to 5 ft. Wave Detail: SW 3 ft at 6 seconds.
Patchy fog in the morning. A chance of rain in the morning with
vsby 1 to 3 NM.
.SAT NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S
4 ft at 8 seconds and N 3 ft at 5 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: W 4 ft at 5 seconds and S 3 ft at
8 seconds.
.MON AND MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to
15 kt. Seas 3 to 5 ft.
.TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.
.TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of rain.

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.

$$

ANZ256-211000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 7 seconds and NE 1 foot at
3 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 4 seconds.
.FRI NIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and E 2 ft at
7 seconds. A chance of showers after midnight with vsby 1 to
3 NM.
.SAT...N winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: N 3 ft at 4 seconds and E
2 ft at 7 seconds. Patchy fog in the morning. A chance of rain in
the morning with vsby 1 to 3 NM.
.SAT NIGHT...N winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: N
3 ft at 4 seconds and S 3 ft at 6 seconds.
.SUN AND SUN NIGHT...W winds 15 to 20 kt. Seas 2 to 4 ft. Wave
Detail: W 3 ft at 4 seconds and S 3 ft at 8 seconds.
.MON THROUGH TUE...SE winds 15 to 20 kt. Seas 2 to 4 ft.
.TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Rain likely.

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.

$$

ANZ232-211000-
Nantucket Sound-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW around 5 kt after
midnight. Seas 1 foot or less. Wave Detail: N 1 foot at 3 seconds
and S 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then 2 to 3 ft
in the afternoon. Wave Detail: SE 1 foot at 5 seconds and E
1 foot at 11 seconds, becoming SW 2 ft at 3 seconds and E 1 foot
at 5 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 3 seconds and E 1 foot at 5 seconds. Patchy
fog after midnight. A chance of showers after midnight.
.SAT...NW winds 10 to 15 kt, becoming N 15 to 20 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E
1 foot at 7 seconds. Patchy fog in the morning. A chance of rain
in the morning with vsby 1 to 3 NM.
.SAT NIGHT...N winds 15 to 20 kt, becoming NW 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and SE
1 foot at 7 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: NW 2 ft at 3 seconds and NE 2 ft at 6 seconds.
.MON THROUGH TUE...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft.
.TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 3 ft. A chance of
rain.

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.

$$

ANZ233-211000-
Vineyard Sound-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW around 5 kt after
midnight. Seas 1 foot or less. Wave Detail: N 1 foot at 3 seconds
and S 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: S 2 ft
at 5 seconds and E 1 foot at 4 seconds.
.FRI NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 5 seconds and SE 1 foot at 6 seconds. Patchy fog after
midnight. A chance of showers after midnight.
.SAT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: W 2 ft at 5 seconds and NE 1 foot at
5 seconds. Patchy fog in the morning. A chance of rain in the
morning with vsby 1 to 3 NM.
.SAT NIGHT...N winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 7 seconds and N 1 foot at 4 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: W 2 ft at 4 seconds and SW 2 ft at 8 seconds.
.MON THROUGH TUE...SE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft.
.TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 3 ft. Rain likely.

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.

$$

ANZ234-211000-
Buzzards Bay-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW after midnight. Seas
1 foot or less. Wave Detail: N 1 foot at 3 seconds and S 1 foot
at 7 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW
2 ft at 3 seconds and NE 1 foot at 4 seconds.
.FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 1 foot at 6 seconds. Patchy
fog after midnight. A chance of showers after midnight.
.SAT...N winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: N 1 foot at 3 seconds and W 1 foot at
5 seconds. Patchy fog in the morning. A chance of rain in the
morning with vsby 1 to 3 NM.
.SAT NIGHT...NW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
N 1 foot at 3 seconds and S 1 foot at 6 seconds.
.SUN AND SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 4 seconds and SW 2 ft at 7 seconds.
.MON THROUGH TUE...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft.
.TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 3 ft. Rain likely.

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.

$$

ANZ235-211000-
Rhode Island Sound-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW around 5 kt after
midnight. Seas around 2 ft this evening, then 1 foot or less.
Wave Detail: S 2 ft at 7 seconds and N 1 foot at 2 seconds,
becoming E 1 foot at 3 seconds and S 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW
3 ft at 4 seconds and E 1 foot at 3 seconds.
.FRI NIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 6 seconds. A chance of showers
after midnight with vsby 1 to 3 NM.
.SAT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NW 2 ft at 5 seconds and SE 2 ft at 6 seconds.
Patchy fog in the morning. A chance of rain in the morning with
vsby 1 to 3 NM.
.SAT NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and N
2 ft at 3 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: W 3 ft at 4 seconds and S 3 ft at 8 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt.
Seas 2 to 3 ft.
.TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. A chance of rain.
.TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 4 ft. Rain likely.

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.

$$

ANZ237-211000-
Block Island Sound-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW around 5 kt after
midnight. Seas around 2 ft this evening, then 1 foot or less.
Wave Detail: S 2 ft at 7 seconds and E 1 foot at 3 seconds,
becoming E 1 foot at 3 seconds and S 1 foot at 7 seconds.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 3 seconds and SE 1 foot at 7 seconds.
.FRI NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 5 seconds. A chance of showers after midnight with vsby 1 to
3 NM.
.SAT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 3 seconds and S 2 ft at 6 seconds.
Patchy fog in the morning. A chance of rain in the morning with
vsby 1 to 3 NM.
.SAT NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and S
2 ft at 6 seconds.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 8 seconds and W 2 ft at 3 seconds.
.MON AND MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt. Seas 2 to 3 ft.
.TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. A chance of rain.
.TUE NIGHT...S winds around 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Rain likely.

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.

$$

ANZ230-211000-
Boston Harbor-
404 PM EST Thu Nov 20 2025

.TONIGHT...SE winds around 5 kt, becoming SW around 5 kt after
midnight. Waves 1 foot or less.
.FRI...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft.
.FRI NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog
after midnight.
.SAT...NW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 20 kt. Waves around 2 ft.
.SAT NIGHT...NW winds 10 to 15 kt. Waves around 2 ft.
.SUN AND SUN NIGHT...W winds 5 to 10 kt. Waves around 2 ft.
.MON THROUGH TUE...SW winds 10 to 15 kt. Waves 1 foot or less.
.TUE NIGHT...S winds 10 to 15 kt. Waves around 2 ft. Rain likely.


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.

$$

ANZ236-211000-
Narragansett Bay-
404 PM EST Thu Nov 20 2025

.TONIGHT...NE winds around 5 kt, becoming NW around 5 kt after
midnight. Waves 1 foot or less.
.FRI...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Waves 2 to 3 ft.
.FRI NIGHT...W winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Waves 2 to 3 ft. Patchy fog after midnight. A chance of
showers after midnight.
.SAT...NW winds 5 to 10 kt, becoming N 10 to 15 kt in the
afternoon. Gusts up to 20 kt. Waves around 2 ft. Patchy fog in
the morning. A chance of rain in the morning.
.SAT NIGHT...NW winds 5 to 10 kt. Waves around 2 ft.
.SUN AND SUN NIGHT...W winds 5 to 10 kt. Waves around 2 ft.
.MON AND MON NIGHT...NW winds 10 to 15 kt, diminishing to 5 to
10 kt. Waves around 2 ft.
.TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Waves 1 foot
or less. A chance of rain.
.TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 4 ft. Rain likely.

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.

$$

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