411
FZUS51 KBOX 022303
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
703 PM EDT Sat Aug 2 2025

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

ANZ200-031200-
703 PM EDT Sat Aug 2 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
A sprawling high pres builds across New England this weekend and
lingers through most of next week. Rather tranquil marine
conditions with good visibility expected.

$$

ANZ250-031200-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
703 PM EDT Sat Aug 2 2025

.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and N 1 foot at
3 seconds.
.SUN...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at
3 seconds and E 2 ft at 8 seconds.
.SUN NIGHT...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 E 2 ft at
7 seconds.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 3 seconds and E 2 ft at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and S 1 foot at 3 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 7 seconds and S 1 foot at 2 seconds.
.WED THROUGH THU NIGHT...S winds 5 to 10 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.

$$

ANZ251-031200-
Massachusetts Bay and Ipswich Bay-
703 PM EDT Sat Aug 2 2025

.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds.
.SUN...SW winds around 5 kt, becoming SE 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: S
2 ft at 3 seconds and E 2 ft at 8 seconds.
.SUN NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at
8 seconds.
.MON...SW winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and S 1 foot at
3 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 3 seconds and E 2 ft at 7 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 7 seconds and S 1 foot at 2 seconds.
.WED THROUGH THU NIGHT...S winds 10 to 15 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.

$$

ANZ231-031200-
Cape Cod Bay-
703 PM EDT Sat Aug 2 2025

.TONIGHT...SE winds around 5 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: N 1 foot at 4 seconds.
.SUN...SW winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: N 1 foot at 3 seconds and NE 1 foot at
6 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
1 foot at 2 seconds and E 1 foot at 7 seconds.
.MON...SW winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: SW
1 foot at 2 seconds and E 1 foot at 7 seconds, becoming S 1 foot
at 2 seconds and E 1 foot at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: S 1 foot at 2 seconds and E 1 foot at 7 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 7 seconds and E 1 foot at 2 seconds.
.WED THROUGH THU NIGHT...SE winds 5 to 10 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.

$$

ANZ254-031200-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
703 PM EDT Sat Aug 2 2025

.TONIGHT...E winds around 5 kt, becoming S after midnight. Seas
2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and N 1 foot at
3 seconds.
.SUN...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 7 seconds and N 1 foot at 3 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 7 seconds and S 1 foot at 3 seconds.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
7 seconds.
.MON NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 8 seconds.
.WED THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up to
20 kt. Seas 3 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.

$$

ANZ255-031200-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
703 PM EDT Sat Aug 2 2025

.TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 7 seconds and N 1 foot at 3 seconds.
.SUN...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at
7 seconds and SE 1 foot at 2 seconds.
.SUN NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 7 seconds and SE 1 foot at 3 seconds.
.MON...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
7 seconds.
.MON NIGHT THROUGH TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to
4 ft. Wave Detail: E 4 ft at 7 seconds.
.WED THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to
20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds.

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.

$$

ANZ256-031200-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
703 PM EDT Sat Aug 2 2025

.TONIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds.
.SUN...NE winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 8 seconds.
.SUN NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
2 ft at 8 seconds.
.MON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds.
.MON NIGHT THROUGH TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to
4 ft. Wave Detail: E 4 ft at 7 seconds.
.WED THROUGH THU NIGHT...E winds around 15 kt with gusts up to
20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds.

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.

$$

ANZ232-031200-
Nantucket Sound-
703 PM EDT Sat Aug 2 2025

.TONIGHT...E winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and NE 1 foot at
2 seconds.
.SUN...E winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: N 1 foot at 3 seconds and E 1 foot at
7 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 1 foot at 3 seconds and E 1 foot at 7 seconds.
.MON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
1 foot at 2 seconds and E 1 foot at 7 seconds.
.MON NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
S 1 foot at 3 seconds and E 1 foot at 7 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 7 seconds and E 1 foot at 2 seconds.
.WED THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ233-031200-
Vineyard Sound-
703 PM EDT Sat Aug 2 2025

.TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas
1 foot or less. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot
at 6 seconds.
.SUN...NE winds around 5 kt, becoming S in the afternoon. Seas
1 foot or less. Wave Detail: S 1 foot at 2 seconds and E 1 foot
at 7 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: S 1 foot at 2 seconds and SE 1 foot at 8 seconds.
.MON...S winds around 5 kt, increasing to around 10 kt in the
afternoon. Seas 1 foot or less, then around 2 ft in the
afternoon. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at
7 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
1 foot at 2 seconds and SE 1 foot at 7 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 7 seconds and E 1 foot at 2 seconds.
.WED THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ234-031200-
Buzzards Bay-
703 PM EDT Sat Aug 2 2025

.TONIGHT...SE winds 5 to 10 kt, becoming W after midnight. Seas
1 foot or less. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot
at 5 seconds.
.SUN...N winds around 5 kt, becoming S in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail: E
1 foot at 7 seconds, becoming S 1 foot at 2 seconds and SE 1 foot
at 8 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: S 1 foot at 2 seconds and SE
1 foot at 8 seconds, becoming S 1 foot at 2 seconds and SE 1 foot
at 7 seconds.
.MON...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S
1 foot at 2 seconds and SE 1 foot at 7 seconds.
.MON NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
1 foot or less. Wave Detail: S 1 foot at 2 seconds and SE 1 foot
at 7 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 1 foot at 2 seconds and SE 1 foot at 8 seconds.
.WED THROUGH THU NIGHT...SE 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.

$$

ANZ235-031200-
Rhode Island Sound-
703 PM EDT Sat Aug 2 2025

.TONIGHT...SE winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SE 1 foot at
3 seconds.
.SUN...NE winds around 5 kt, becoming SE in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail: E
1 foot at 8 seconds, becoming SE 1 foot at 3 seconds and SE
1 foot at 8 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SE 1 foot at 3 seconds.
.MON...S winds around 5 kt, increasing to around 10 kt in the
afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds.
.MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 7 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 8 seconds.
.WED THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ237-031200-
Block Island Sound-
703 PM EDT Sat Aug 2 2025

.TONIGHT...SE winds around 5 kt, becoming SW around 5 kt after
midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds.
.SUN...NE winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SE 1 foot at
2 seconds.
.SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and S 1 foot at 2 seconds.
.MON...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds.
.MON NIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 8 seconds.
.WED THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up to
20 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.

$$

ANZ230-031200-
Boston Harbor-
703 PM EDT Sat Aug 2 2025

.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves
1 foot or less.
.SUN...SW winds around 5 kt, becoming SE 10 to 15 kt in the
afternoon. Waves 1 foot or less, then around 2 ft in the
afternoon.
.SUN NIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. Waves around 2 ft in the evening, then 1 foot or less.
.MON...SW winds 5 to 10 kt, becoming SE in the afternoon. Waves
1 foot or less.
.MON NIGHT...S winds 5 to 10 kt. Waves 1 foot or less.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.WED THROUGH THU NIGHT...S winds 10 to 15 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.

$$

ANZ236-031200-
Narragansett Bay-
703 PM EDT Sat Aug 2 2025

.TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Waves
1 foot or less.
.SUN...N winds around 5 kt, becoming S in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.SUN NIGHT...S winds 5 to 10 kt. Waves 1 foot or less.
.MON...S winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft
in the afternoon.
.MON NIGHT...S winds 5 to 10 kt, becoming W after midnight. Waves
around 2 ft.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.WED THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up to
20 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.

$$

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