149
FZUS51 KBOX 191104
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
704 AM EDT Sat Jul 19 2025

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

ANZ200-200000-
704 AM EDT Sat Jul 19 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres builds over the waters today. A warm front lifts N across
the waters late tonight into Sun followed by a cold front passage
late Sun into Sun night.  High pres will build into the region Mon
and Tue, moving offshore Wed into Thu.

$$

ANZ250-200000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
704 AM EDT Sat Jul 19 2025

.TODAY...NW winds around 5 kt, becoming S 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: N 1 foot
at 4 seconds and S 1 foot at 6 seconds.
.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 3 seconds and N 1 foot at 3 seconds.
Patchy fog after midnight with vsby 1 NM or less.
.SUN...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at
9 seconds. A chance of showers. A chance of tstms in the
afternoon. Patchy fog in the morning with vsby 1 to 3 NM.
.SUN NIGHT...W winds around 10 kt, becoming NW after midnight.
Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at
4 seconds and S 2 ft at 4 seconds. A chance of showers and tstms
in the evening.
.MON AND MON NIGHT...N winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: N 3 ft at 5 seconds and S 1 foot at
7 seconds.
.TUE THROUGH WED NIGHT...S winds 15 to 20 kt with gusts up to
25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and N
2 ft at 5 seconds.

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.

$$

ANZ251-200000-
Massachusetts Bay and Ipswich Bay-
704 AM EDT Sat Jul 19 2025

.TODAY...N winds around 5 kt, becoming SE 10 to 15 kt with gusts
up to 20 kt this afternoon. Seas 1 foot or less, then around 2 ft
this afternoon. Wave Detail: N 1 foot at 4 seconds and S 1 foot
at 5 seconds, becoming S 1 foot at 3 seconds and N 1 foot at
4 seconds.
.TONIGHT...S 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 NE 1 foot at
3 seconds.
.SUN...S winds around 10 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
3 seconds. A chance of showers in the morning, then showers
likely with a chance of tstms in the afternoon.
.SUN NIGHT...W winds 10 to 15 kt, becoming NW with gusts up to
20 kt after midnight. Seas around 2 ft. Wave Detail: NW 2 ft at
3 seconds and SE 1 foot at 4 seconds. A chance of showers and
tstms in the evening.
.MON AND MON NIGHT...N winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and S 1 foot
at 6 seconds.
.TUE THROUGH WED NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 3 seconds and N
2 ft at 4 seconds.

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.

$$

ANZ231-200000-
Cape Cod Bay-
704 AM EDT Sat Jul 19 2025

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

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.

$$

ANZ254-200000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
704 AM EDT Sat Jul 19 2025

.TODAY...N winds around 5 kt, becoming S this afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and N 1 foot at
5 seconds.
.TONIGHT...S winds around 10 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 2 ft at 6 seconds and N 1 foot at 4 seconds.
.SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
9 seconds. A chance of showers and tstms. Vsby 1 to 3 NM.
.SUN NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at
3 seconds and S 2 ft at 5 seconds. A chance of showers in the
evening with vsby 1 to 3 NM.
.MON AND MON NIGHT...N 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 S 2 ft at
6 seconds.
.TUE THROUGH WED NIGHT...S 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 S
2 ft at 5 seconds.

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.

$$

ANZ255-200000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
704 AM EDT Sat Jul 19 2025

.TODAY...NE winds around 5 kt, becoming S this afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and N 1 foot at
4 seconds.
.TONIGHT...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 6 seconds and N 1 foot at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at
9 seconds. A chance of showers. A chance of tstms in the morning.
Patchy fog in the morning. Vsby 1 to 3 NM.
.SUN NIGHT...SW winds 10 to 15 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at
6 seconds and NW 2 ft at 3 seconds. A chance of showers in the
evening with vsby 1 to 3 NM.
.MON AND MON NIGHT...N winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and S 3 ft at
6 seconds.
.TUE THROUGH WED NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and N
2 ft at 4 seconds.

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.

$$

ANZ256-200000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
704 AM EDT Sat Jul 19 2025

.TODAY...E winds around 5 kt, becoming S this afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 1 foot at
10 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight.
Seas around 3 ft. Wave Detail: S 2 ft at 5 seconds and SE 1 foot
at 9 seconds. A chance of showers and tstms after midnight with
vsby 1 NM or less.
.SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas around
3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at
9 seconds. A chance of showers. A chance of tstms in the morning.
.SUN NIGHT...W winds 10 to 15 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas around 3 ft. Wave Detail: S 3 ft at
6 seconds and NW 2 ft at 4 seconds.
.MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and S 2 ft at
6 seconds.
.TUE THROUGH WED NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NE
2 ft at 4 seconds.

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.

$$

ANZ232-200000-
Nantucket Sound-
704 AM EDT Sat Jul 19 2025

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

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.

$$

ANZ233-200000-
Vineyard Sound-
704 AM EDT Sat Jul 19 2025

.TODAY...E winds around 5 kt, becoming S this afternoon. Seas
around 2 ft. Wave Detail: SW 2 ft at 7 seconds and N 1 foot at
4 seconds.
.TONIGHT...S winds around 10 kt. Seas around 2 ft. Wave Detail: S
2 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at
9 seconds. A chance of showers and tstms.
.SUN NIGHT...W winds 10 to 15 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at
5 seconds and W 1 foot at 2 seconds. A chance of showers and
tstms in the evening with vsby 1 to 3 NM.
.MON AND MON NIGHT...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 S 1 foot
at 6 seconds.
.TUE THROUGH WED NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and N
1 foot at 3 seconds.

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.

$$

ANZ234-200000-
Buzzards Bay-
704 AM EDT Sat Jul 19 2025

.TODAY...NE winds around 5 kt, becoming S with gusts up to 20 kt
this afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at
6 seconds and N 1 foot at 4 seconds.
.TONIGHT...S winds around 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and
SE 1 foot at 9 seconds. Patchy fog after midnight with vsby 1 to
3 NM.
.SUN...S 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 SE 1 foot at
9 seconds. A chance of showers and tstms.
.SUN NIGHT...W winds around 10 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at
4 seconds and SE 1 foot at 9 seconds. A chance of showers and
tstms in the evening.
.MON AND MON NIGHT...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 SW
1 foot at 6 seconds.
.TUE THROUGH WED NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and N
1 foot at 3 seconds.

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.

$$

ANZ235-200000-
Rhode Island Sound-
704 AM EDT Sat Jul 19 2025

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

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.

$$

ANZ237-200000-
Block Island Sound-
704 AM EDT Sat Jul 19 2025

.TODAY...E winds around 5 kt, becoming S this afternoon. Seas
2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and SE 1 foot at
9 seconds.
.TONIGHT...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 5 seconds and SE 1 foot at 9 seconds.
.SUN...S winds around 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot
at 9 seconds. A chance of showers and tstms.
.SUN NIGHT...W winds around 10 kt, becoming NW with gusts up to
20 kt after midnight. Seas 2 to 3 ft. Wave Detail: NW 2 ft at
3 seconds and S 2 ft at 5 seconds. A chance of showers and tstms
in the evening.
.MON...NW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and S 2 ft at
6 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
NE 2 ft at 4 seconds and S 2 ft at 7 seconds.
.TUE THROUGH WED NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.

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.

$$

ANZ230-200000-
Boston Harbor-
704 AM EDT Sat Jul 19 2025

.TODAY...N winds around 5 kt, becoming SE this afternoon. Waves
1 foot or less, then around 2 ft this afternoon.
.TONIGHT...S winds around 10 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft.
.SUN...SW winds around 10 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft. A chance of showers in the morning, then
showers likely with a chance of tstms in the afternoon.
.SUN NIGHT...W winds 5 to 10 kt, becoming NW 10 to 15 kt with
gusts up to 20 kt after midnight. Waves around 2 ft. A chance of
showers and tstms in the evening.
.MON AND MON NIGHT...N winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.TUE THROUGH WED NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Waves around 2 ft.

Winds and waves 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.

$$

ANZ236-200000-
Narragansett Bay-
704 AM EDT Sat Jul 19 2025

.TODAY...E winds around 5 kt, becoming S this afternoon. Waves
around 2 ft.
.TONIGHT...S winds 5 to 10 kt. Waves around 2 ft.
.SUN...S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft. A chance of showers and tstms.
.SUN NIGHT...W winds 5 to 10 kt, becoming NW after midnight.
Waves around 2 ft. A chance of showers and tstms in the evening.
.MON AND MON NIGHT...N winds 10 to 15 kt. Waves around 2 ft.
.TUE THROUGH WED NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Waves around 2 ft.

Winds and waves 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.

$$

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