529
FZUS51 KBOX 041403
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1003 AM EDT Mon Aug 4 2025

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

ANZ200-050300-
1003 AM EDT Mon Aug 4 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
A prolonged period of rather tranquil marine conditions due to a
vast high pres most of this week, but will need to monitor a low
pres off the Carolina coast. This feature may send swells towards
srn New England from Wednesday through early Friday.

$$

ANZ250-050300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds 5 to 10 kt, becoming S. Seas around
2 ft. Wave Detail: E 2 ft at 7 seconds and SW 1 foot at
3 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and S 1 foot at 2 seconds.
.TUE...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft
at 3 seconds and E 2 ft at 8 seconds.
.TUE NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds and NE 2 ft at 4 seconds.
.WED AND WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 9 seconds and NE 1 foot at 4 seconds.
.THU THROUGH FRI NIGHT...S winds 5 to 10 kt with gusts up to
20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and SE
2 ft at 3 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.

$$

ANZ251-050300-
Massachusetts Bay and Ipswich Bay-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds around 5 kt, becoming SE. Seas around
2 ft. Wave Detail: E 2 ft at 7 seconds and SW 1 foot at
2 seconds.
.TONIGHT...S winds 5 to 10 kt, becoming E after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at
3 seconds. Patchy smoke in the evening.
.TUE...NE winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds
and E 2 ft at 7 seconds.
.TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
NE 2 ft at 4 seconds and E 2 ft at 8 seconds.
.WED AND WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 9 seconds and NE 1 foot at 4 seconds.
.THU THROUGH FRI NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE
2 ft at 3 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.

$$

ANZ231-050300-
Cape Cod Bay-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds around 5 kt, becoming S. Seas 1 foot
or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at
7 seconds. Patchy smoke.
.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: E 2 ft at 7 seconds and S
1 foot at 2 seconds, becoming SW 1 foot at 2 seconds and E 1 foot
at 7 seconds.
.TUE...E winds 5 to 10 kt, becoming NE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 8 seconds and NE 1 foot at
2 seconds.
.TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 8 seconds and NE 1 foot at 3 seconds.
.WED AND WED NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 8 seconds and NE 1 foot at 4 seconds.
.THU THROUGH FRI NIGHT...S winds 5 to 10 kt. Seas around 2 ft.
Wave Detail: E 2 ft at 8 seconds and E 1 foot at 2 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.

$$

ANZ254-050300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 7 seconds and SW 1 foot at 2 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds.
.TUE...E winds 5 to 10 kt, becoming NE in the afternoon. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and NE 1 foot at
2 seconds.
.TUE NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
E 3 ft at 9 seconds and NE 2 ft at 3 seconds.
.WED AND WED NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and NE 2 ft at
4 seconds.
.THU THROUGH FRI NIGHT...SE winds 10 to 15 kt with gusts up to
20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and E
1 foot at 2 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.

$$

ANZ255-050300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 7 seconds.
.TONIGHT...S winds 5 to 10 kt, becoming SE after midnight. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds.
.TUE...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
8 seconds and NE 1 foot at 2 seconds.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: E
4 ft at 9 seconds and NE 1 foot at 3 seconds.
.WED AND WED NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and NE 2 ft at
4 seconds.
.THU THROUGH FRI NIGHT...E winds 10 to 15 kt with gusts up to
20 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and E
2 ft at 4 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.

$$

ANZ256-050300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 8 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds.
.TUE...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
8 seconds.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
4 ft at 8 seconds and E 1 foot at 3 seconds.
.WED AND WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and NE 1 foot at
3 seconds.
.THU THROUGH FRI NIGHT...E winds 10 to 15 kt with gusts up to
20 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft at 9 seconds and E
2 ft at 4 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.

$$

ANZ232-050300-
Nantucket Sound-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 2 seconds and E 1 foot at 7 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 2 seconds and E 1 foot at 7 seconds.
.TUE...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
1 foot at 2 seconds and E 1 foot at 7 seconds.
.TUE NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
NE 2 ft at 3 seconds and E 2 ft at 7 seconds.
.WED AND WED NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and E 2 ft at
8 seconds.
.THU THROUGH FRI NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft.
Wave Detail: E 2 ft at 3 seconds and E 2 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.

$$

ANZ233-050300-
Vineyard Sound-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft. Wave Detail: SW 1 foot at 2 seconds and SE 1 foot at
8 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 3 seconds and SE 1 foot at 8 seconds.
.TUE...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
1 foot at 2 seconds and SE 1 foot at 8 seconds.
.TUE NIGHT...NE winds around 10 kt. Seas around 2 ft. Wave
Detail: NE 1 foot at 3 seconds and SE 1 foot at 8 seconds.
.WED AND WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and SE
1 foot at 8 seconds.
.THU THROUGH FRI NIGHT...SE winds 10 to 15 kt. Seas around 2 ft.
Wave Detail: NE 1 foot at 3 seconds and SE 1 foot 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.

$$

ANZ234-050300-
Buzzards Bay-
1003 AM EDT Mon Aug 4 2025

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

$$

ANZ235-050300-
Rhode Island Sound-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and SW 1 foot at 2 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and SW 1 foot at 3 seconds.
.TUE...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft
at 8 seconds and E 1 foot at 2 seconds.
.TUE NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SE 3 ft at 8 seconds and E 2 ft at 4 seconds.
.WED AND WED NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and NE 2 ft at
3 seconds.
.THU THROUGH FRI NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft.
Wave Detail: E 3 ft at 5 seconds and SE 3 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.

$$

ANZ237-050300-
Block Island Sound-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and W 1 foot at 2 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and SW 1 foot at 3 seconds.
.TUE...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds and E 1 foot at 2 seconds.
.TUE NIGHT...E winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 3 ft at 8 seconds and E 1 foot at 3 seconds.
.WED AND WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and NE 1 foot
at 3 seconds.
.THU THROUGH FRI NIGHT...SE winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds and E
2 ft at 4 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.

$$

ANZ230-050300-
Boston Harbor-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...SW winds around 5 kt, becoming SE. Waves 1 foot
or less. Patchy smoke.
.TONIGHT...SE winds 5 to 10 kt. Waves 1 foot or less. Patchy
smoke in the evening.
.TUE...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Waves around 2 ft.
.TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft in the
evening, then 1 foot or less.
.WED AND WED NIGHT...E winds 5 to 10 kt. Waves around 2 ft.
.THU THROUGH FRI 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.

$$

ANZ236-050300-
Narragansett Bay-
1003 AM EDT Mon Aug 4 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less.
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Waves
around 2 ft.
.TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.WED AND WED NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.THU THROUGH FRI NIGHT...SE winds 5 to 10 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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