196
FZUS51 KBOX 220205
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 PM EDT Tue Jul 21 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM

ANZ200-221500-
1004 PM EDT Tue Jul 21 2026

.Synopsis for Massachusetts and Rhode Island coastal waters...
An approaching cold front will result in S-SW winds increasing to 20
to 30 kt into Wed. Widespread showers with scattered thunderstorms
will impact the waters Tue afternoon and night, with localized brief
stronger wind gusts and torrential downpours. In addition...long
southerly fetch will result in seas building to between 7 and 12
feet across our southern waters by Wed. Showers and thunderstorms
not as widespread Wed, along with periods of dry weather. High pres
builds across the waters Thu and into the weekend, bringing much
lighter winds/lowering wave heights.

$$

ANZ250-221500-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: S 4 ft at 6 seconds. Showers with a
chance of tstms, then a chance of showers with a slight chance of
tstms. Patchy fog.
.WED...S winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SE 5 ft at 8 seconds and S 5 ft at 8 seconds.
Patchy fog in the morning. A chance of showers in the morning
with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt,
becoming W after midnight. Seas 3 to 5 ft. Wave Detail: S 5 ft at
8 seconds and SE 4 ft at 10 seconds.
.THU...NW winds 5 to 10 kt, becoming SE in the afternoon. Seas
2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 2 ft at
10 seconds.
.THU NIGHT...S winds around 5 kt, becoming SW after midnight.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and NW 1 foot
at 3 seconds.
.FRI AND FRI NIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave
Detail: SE 2 ft at 7 seconds and S 1 foot at 2 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 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.

$$

ANZ251-221500-
Massachusetts Bay and Ipswich Bay-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 5 seconds. Showers with a
chance of tstms, then a chance of showers with isolated tstms.
Patchy fog.
.WED...S winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 6 seconds and SW 2 ft at 3 seconds. A chance of showers.
Patchy fog in the morning with vsby 1 NM or less.
.WED 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: S 3 ft at 4 seconds and SE 2 ft at 8 seconds. A chance of
showers and tstms in the evening.
.THU...NW winds 5 to 10 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 10 seconds and W 1 foot at
2 seconds.
.THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and S 2 ft at
8 seconds.
.FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 7 seconds and S 1 foot at 3 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 kt. Seas around 2 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.

$$

ANZ231-221500-
Cape Cod Bay-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E 1 foot at
11 seconds. Showers with a chance of tstms. Patchy fog.
.WED...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
7 seconds. A chance of showers. Patchy fog in the morning with
vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft. Wave
Detail: S 3 ft at 4 seconds and SE 3 ft at 10 seconds. A chance
of showers in the evening.
.THU...NW winds 5 to 10 kt, becoming NE in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 5 seconds and NW 1 foot at
2 seconds. A chance of showers in the morning.
.THU NIGHT...SE winds around 5 kt, becoming W after midnight.
Seas around 2 ft in the evening, then 1 foot or less. Wave
Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds, becoming
SW 1 foot at 2 seconds and E 1 foot at 8 seconds.
.FRI AND FRI NIGHT...E winds around 5 kt. Seas 1 foot or less.
Wave Detail: W 1 foot at 2 seconds and SE 1 foot at 7 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less.


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.

$$

ANZ254-221500-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 15 to 20 kt, increasing to 20 to 25 kt.
Gusts up to 30 kt. Seas 4 to 5 ft, building to 5 to 7 ft. Wave
Detail: S 5 ft at 5 seconds and E 1 foot at 8 seconds, becoming S
7 ft at 6 seconds and E 1 foot at 11 seconds. Showers with a
chance of tstms. Patchy fog.
.WED...S winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Wave Detail: SW 8 ft at 6 seconds and SE 5 ft at 9 seconds.
Patchy fog. Showers likely in the morning. A chance of showers in
the afternoon. Vsby 1 NM or less in the morning.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt,
becoming W 10 to 15 kt with gusts up to 20 kt after midnight.
Seas 5 to 8 ft. Wave Detail: S 8 ft at 9 seconds and SE 5 ft at
10 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less,
increasing to 1 to 3 NM after midnight.
.THU...NW winds around 10 kt, becoming NE in the afternoon. Seas
4 to 6 ft. Wave Detail: SE 5 ft at 9 seconds and E 2 ft at
10 seconds. A chance of showers.
.THU NIGHT...E winds around 5 kt, becoming N after midnight. Seas
3 to 5 ft. Wave Detail: S 4 ft at 8 seconds and SE 2 ft at
8 seconds.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: SE 3 ft at 7 seconds and W 1 foot at 3 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 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.

$$

ANZ255-221500-
Coastal Waters extending out to 25 NM South of Marthas Vineyard
and Nantucket-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
5 to 6 ft, building to 6 to 9 ft. Wave Detail: SE 6 ft at
7 seconds and NW 1 foot at 7 seconds, becoming S 9 ft at
7 seconds and W 3 ft at 7 seconds. Showers. A slight chance of
tstms, then a chance of tstms. Patchy fog with vsby 1 NM or less.
.WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to
10 ft. Wave Detail: W 9 ft at 7 seconds and E 1 foot at
8 seconds. Patchy fog. Showers likely with a chance of tstms in
the morning, then a chance of showers in the afternoon. Vsby 1 NM
or less in the morning.
.WED NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 6 to 9 ft. Wave Detail: S
9 ft at 9 seconds and SE 3 ft at 10 seconds. Patchy fog. A chance
of showers in the evening. Showers likely after midnight. Vsby
1 to 3 NM in the evening.
.THU...N winds around 10 kt, becoming NE in the afternoon. Seas
5 to 7 ft. Wave Detail: S 6 ft at 9 seconds and E 2 ft at
11 seconds. Showers likely, mainly in the morning. Patchy fog in
the morning.
.THU NIGHT AND FRI...E winds 5 to 10 kt. Seas 3 to 5 ft. Wave
Detail: S 5 ft at 8 seconds and SE 2 ft at 7 seconds.
.FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 7 seconds and NW 1 foot at 6 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 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.

$$

ANZ256-221500-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 NM South of Block Island-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas
6 to 7 ft, building to 7 to 9 ft. Wave Detail: SE 7 ft at
7 seconds and W 2 ft at 6 seconds, becoming SW 9 ft at 7 seconds
and E 2 ft at 8 seconds. Showers with a chance of tstms. Patchy
fog.
.WED...SW winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Seas 7 to 10 ft. Wave Detail: S
9 ft at 8 seconds and W 4 ft at 7 seconds. A chance of showers. A
chance of tstms in the morning. Patchy fog in the morning with
vsby 1 NM or less.
.WED NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 6 to 8 ft. Wave Detail: S 8 ft
at 9 seconds and W 3 ft at 9 seconds. Patchy fog. A chance of
showers. Vsby 1 to 3 NM.
.THU...N winds 5 to 10 kt, becoming E in the afternoon. Seas 4 to
6 ft. Wave Detail: S 6 ft at 9 seconds and E 2 ft at 11 seconds.
A chance of showers in the morning.
.THU NIGHT THROUGH FRI NIGHT...E winds 5 to 10 kt. Seas 3 to
5 ft. Wave Detail: S 5 ft at 8 seconds and SE 2 ft at 8 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft.
Wave Detail: SE 3 ft at 8 seconds and S 2 ft at 8 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.

$$

ANZ232-221500-
Nantucket Sound-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 20 to 25 kt, becoming SW 25 to 30 kt. Seas
3 to 4 ft, building to 4 to 6 ft. Wave Detail: SE 4 ft at
5 seconds and W 1 foot at 6 seconds, becoming S 5 ft at 6 seconds
and E 1 foot at 11 seconds. Showers with a chance of tstms.
Patchy fog.
.WED...SW winds 25 to 30 kt, diminishing to 20 to 25 kt in the
afternoon. Seas 4 to 6 ft. Wave Detail: S 5 ft at 7 seconds and
SW 3 ft at 4 seconds. Showers likely in the morning. A chance of
showers in the afternoon. Patchy fog in the morning with vsby
1 to 3 NM.
.WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt,
becoming W 10 to 15 kt with gusts up to 20 kt after midnight.
Seas 3 to 5 ft. Wave Detail: SW 4 ft at 8 seconds and SE 4 ft at
9 seconds. A chance of showers. Patchy fog in the evening with
vsby 1 to 3 NM.
.THU...N winds around 10 kt, becoming NE in the afternoon. Seas
2 to 4 ft. Wave Detail: S 2 ft at 8 seconds and E 2 ft at
10 seconds. A chance of showers in the morning.
.THU NIGHT...E winds 5 to 10 kt, becoming NE after midnight. Seas
2 to 3 ft. Wave Detail: SW 1 foot at 6 seconds and E 1 foot at
7 seconds.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 4 seconds and E 1 foot at 7 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 kt. Seas around 2 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.

$$

ANZ233-221500-
Vineyard Sound-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
3 to 5 ft, building to 5 to 7 ft. Wave Detail: S 5 ft at
6 seconds, becoming S 7 ft at 7 seconds and E 1 foot at
11 seconds. A chance of tstms. Showers, then showers likely.
Patchy fog.
.WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
7 ft. Wave Detail: SW 7 ft at 8 seconds and SW 3 ft at 5 seconds.
Showers likely in the morning. A chance of showers in the
afternoon. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt,
becoming NW 5 to 10 kt after midnight. Seas 4 to 6 ft. Wave
Detail: SW 6 ft at 9 seconds and SE 4 ft at 9 seconds. A chance
of showers. Patchy fog in the evening with vsby 1 to 3 NM.
.THU...N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to
4 ft. Wave Detail: SW 4 ft at 9 seconds and E 2 ft at 8 seconds.
A chance of showers in the morning.
.THU NIGHT THROUGH FRI NIGHT...E winds 5 to 10 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 8 seconds and W 1 foot at
7 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas around 2 ft.
Wave Detail: E 2 ft at 7 seconds and SW 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.

$$

ANZ234-221500-
Buzzards Bay-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: S 5 ft at 5 seconds and NE 1 foot at
11 seconds. Showers with a chance of tstms, then showers likely
with a slight chance of tstms. Patchy fog.
.WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SW 5 ft at 6 seconds. A chance of showers.
Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt,
becoming NW 5 to 10 kt after midnight. Seas 3 to 5 ft. Wave
Detail: SW 4 ft at 9 seconds and SW 3 ft at 4 seconds. A chance
of showers. Patchy fog in the evening with vsby 1 to 3 NM.
.THU...N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to
3 ft. Wave Detail: E 3 ft at 9 seconds and SW 2 ft at 9 seconds.
A chance of showers in the morning.
.THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 2 ft
at 8 seconds.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 4 seconds and S 1 foot at 7 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 kt. Seas around 2 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.

$$

ANZ235-221500-
Rhode Island Sound-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
4 to 6 ft, building to 5 to 8 ft. Wave Detail: SW 6 ft at
6 seconds, becoming SW 8 ft at 7 seconds and SE 4 ft at
8 seconds. A chance of tstms. Showers, then showers likely.
Patchy fog.
.WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
8 ft. Wave Detail: S 8 ft at 8 seconds and SE 4 ft at 7 seconds.
A chance of showers. Patchy fog in the morning with vsby 1 to
3 NM.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt,
becoming NW around 10 kt after midnight. Seas 5 to 7 ft. Wave
Detail: S 7 ft at 9 seconds and SE 4 ft at 9 seconds. A chance of
showers. Patchy fog in the evening with vsby 1 to 3 NM.
.THU...N winds 5 to 10 kt, becoming E in the afternoon. Seas 4 to
6 ft. Wave Detail: S 6 ft at 9 seconds and E 4 ft at 10 seconds.
A chance of showers in the morning.
.THU NIGHT...S winds 5 to 10 kt, becoming NW after midnight. Seas
3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and SE 3 ft at
7 seconds.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: SE 4 ft at 7 seconds and W 1 foot at 7 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 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.

$$

ANZ237-221500-
Block Island Sound-
1004 PM EDT Tue Jul 21 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING...

.OVERNIGHT...SW winds around 20 kt with gusts up to 30 kt. Seas
5 to 7 ft. Wave Detail: SE 6 ft at 6 seconds and W 2 ft at
5 seconds. Showers with a chance of tstms. Patchy fog with vsby
1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to
7 ft. Wave Detail: S 6 ft at 8 seconds and W 2 ft at 5 seconds. A
chance of showers. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt,
becoming NW 5 to 10 kt after midnight. Seas 4 to 6 ft. Wave
Detail: S 6 ft at 9 seconds and E 3 ft at 10 seconds. A chance of
showers.
.THU...N winds 5 to 10 kt, becoming SE in the afternoon. Seas
3 to 5 ft. Wave Detail: S 5 ft at 9 seconds and NW 1 foot at
7 seconds. A chance of showers in the morning.
.THU NIGHT...S winds around 5 kt, becoming N after midnight. Seas
3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and W 1 foot at
8 seconds.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: SE 3 ft at 7 seconds and SW 1 foot at 4 seconds.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 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.

$$

ANZ230-221500-
Boston Harbor-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Waves
around 2 ft. Showers with a chance of tstms, then a chance of
showers with a slight chance of tstms. Patchy fog.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of showers. A chance of tstms in the afternoon.
Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Waves around 2 ft in the
evening, then 1 foot or less. A chance of showers in the evening.
.THU...NW winds 5 to 10 kt, becoming NE in the afternoon. Waves
1 foot or less.
.THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight.
Waves 1 foot or less.
.FRI AND FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 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.

$$

ANZ236-221500-
Narragansett Bay-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Waves
3 to 5 ft. A chance of tstms. Showers, then a chance of showers.
Patchy fog with vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 25 kt. Waves 3 to
5 ft. A chance of showers. Patchy fog in the morning with vsby
1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW 5 to 10 kt after midnight. Waves 2 to 4 ft. A chance
of showers in the evening.
.THU...N winds 5 to 10 kt, becoming NE in the afternoon. Waves
2 to 3 ft.
.THU NIGHT...S winds 5 to 10 kt, becoming NW after midnight.
Waves 2 to 3 ft.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.SAT THROUGH SUN NIGHT...SW winds 5 to 10 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.

$$

ANZ280-221500-
Ocean Waters from the Merrimack River to Plymouth from 40 to
60 NM-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
4 to 5 ft, building to 5 to 7 ft. Wave Detail: S 5 ft at
5 seconds, becoming S 6 ft at 6 seconds. Showers with a chance of
tstms. Patchy fog.
.WED...S winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
8 ft. Wave Detail: S 8 ft at 9 seconds and SW 2 ft at 5 seconds.
Patchy fog in the morning. A chance of showers in the morning
with vsby 1 NM or less.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt,
becoming W 10 to 15 kt with gusts up to 20 kt after midnight.
Seas 5 to 8 ft. Wave Detail: SE 8 ft at 9 seconds and SE 3 ft at
11 seconds. A chance of showers after midnight.
.THU...W winds 5 to 10 kt. Seas 4 to 6 ft. Wave Detail: SE 5 ft
at 9 seconds and E 2 ft at 10 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
3 to 5 ft. Wave Detail: S 4 ft at 8 seconds and SE 2 ft at
8 seconds.
.FRI AND FRI NIGHT...SE winds around 5 kt. Seas 3 to 4 ft. Wave
Detail: S 3 ft at 8 seconds and SE 2 ft at 7 seconds.
.SAT THROUGH SUN NIGHT...S winds 5 to 10 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.

$$

ANZ281-221500-
Ocean Waters from Provincetown to Nantucket from 20 to 60 NM-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
4 to 5 ft, building to 5 to 8 ft. Wave Detail: S 5 ft at
5 seconds and E 1 foot at 8 seconds, becoming SW 8 ft at
6 seconds and E 4 ft at 8 seconds. Showers likely with a slight
chance of tstms, then showers with a chance of tstms. Patchy fog.
.WED...S winds 20 to 25 kt with gusts up to 35 kt. Seas 7 to
10 ft, building to 9 to 10 ft in the afternoon. Wave Detail: S
9 ft at 8 seconds and E 3 ft at 8 seconds, becoming S 10 ft at
9 seconds and SE 5 ft at 9 seconds. Patchy fog. Showers likely in
the morning, then a chance of showers and tstms in the afternoon.
Vsby 1 NM or less in the morning.
.WED NIGHT...SW winds 20 to 25 kt, diminishing to 15 to 20 kt
after midnight. Gusts up to 30 kt. Seas 7 to 10 ft. Wave Detail:
S 9 ft at 9 seconds and SE 4 ft at 10 seconds. Patchy fog. A
chance of showers in the evening. Showers likely with a chance of
tstms after midnight. Vsby 1 to 3 NM.
.THU...W winds 10 to 15 kt with gusts up to 20 kt, becoming N
5 to 10 kt in the afternoon. Seas 5 to 8 ft. Wave Detail: S 8 ft
at 9 seconds and SE 4 ft at 9 seconds. Showers in the morning. A
chance of showers in the afternoon. Patchy fog in the morning.
Vsby 1 to 3 NM.
.THU NIGHT...NE winds 5 to 10 kt. Seas 4 to 6 ft. Wave Detail: S
5 ft at 8 seconds and SE 2 ft at 7 seconds. A chance of showers
in the evening.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 3 to 5 ft. Wave
Detail: S 4 ft at 7 seconds and E 3 ft at 8 seconds.
.SAT THROUGH SUN NIGHT...NW winds 5 to 10 kt. Seas 3 to 4 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.

$$

ANZ282-221500-
Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas
5 to 6 ft, building to 6 to 8 ft. Wave Detail: SE 6 ft at
7 seconds and NW 1 foot at 6 seconds, becoming SW 8 ft at
7 seconds and E 1 foot at 8 seconds. A chance of showers with
isolated tstms, then showers with a chance of tstms. Patchy fog
with vsby 1 NM or less.
.WED...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 8 to
11 ft. Wave Detail: SW 10 ft at 8 seconds and NW 3 ft at
5 seconds. Patchy fog. Showers with a chance of tstms. Vsby 1 to
3 NM in the morning.
.WED NIGHT...SW winds 20 to 25 kt, diminishing to 15 to 20 kt
after midnight. Gusts up to 30 kt. Seas 9 to 10 ft, subsiding to
7 to 10 ft after midnight. Wave Detail: S 10 ft at 9 seconds and
SE 3 ft at 11 seconds, becoming S 9 ft at 9 seconds and E 4 ft at
12 seconds. Patchy fog. Showers with a chance of tstms. Vsby 1 to
3 NM.
.THU...W winds 10 to 15 kt with gusts up to 25 kt, becoming NE
5 to 10 kt in the afternoon. Seas 5 to 8 ft. Wave Detail: S 8 ft
at 9 seconds and E 2 ft at 10 seconds. Showers. A chance of tstms
in the morning. Patchy fog in the morning. Vsby 1 to 3 NM.
.THU NIGHT...NE winds 5 to 10 kt. Seas 4 to 6 ft. Wave Detail: S
6 ft at 8 seconds and E 2 ft at 6 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas 3 to 5 ft. Wave
Detail: SE 4 ft at 7 seconds.
.SAT...NE winds around 10 kt. Seas around 3 ft.
.SAT NIGHT...NE winds 5 to 10 kt. Seas around 3 ft. A chance of
showers.
.SUN AND SUN NIGHT...N winds 5 to 10 kt. Seas 3 to 4 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.

$$

ANZ283-221500-
Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM-
1004 PM EDT Tue Jul 21 2026

.OVERNIGHT...S winds 20 to 25 kt with gusts up to 35 kt. Seas
6 to 7 ft, building to 6 to 9 ft. Wave Detail: S 7 ft at
7 seconds and NW 2 ft at 7 seconds, becoming SW 9 ft at 7 seconds
and W 4 ft at 9 seconds. Showers with a chance of tstms. Patchy
fog.
.WED...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 8 to
11 ft. Wave Detail: S 10 ft at 9 seconds and W 4 ft at 8 seconds.
Patchy fog. Showers likely. A chance of tstms in the morning with
vsby 1 to 3 NM.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
7 to 9 ft. Wave Detail: S 9 ft at 9 seconds and W 3 ft at
9 seconds. Patchy fog. A chance of showers in the evening.
Showers likely after midnight. Vsby 1 to 3 NM.
.THU...N winds around 10 kt, becoming NE in the afternoon. Seas
5 to 7 ft. Wave Detail: S 7 ft at 8 seconds and E 2 ft at
10 seconds. Showers likely in the morning. A chance of showers in
the afternoon. Patchy fog in the morning. Vsby 1 to 3 NM.
.THU NIGHT...NE winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S
5 ft at 8 seconds and NE 2 ft at 5 seconds. A chance of showers
in the evening.
.FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: S 4 ft at 7 seconds and SE 4 ft at 8 seconds.
.SAT THROUGH SUN NIGHT...S winds 10 to 15 kt. Seas 3 to 4 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.

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/us.nationalweatherservice.boston.gov

You can follow us on Twitter at
@NWSBoston