FZUS51 KBOX 181105
CWFBOX
Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
704 AM EDT Tue Aug 18 2026
Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM
ANZ200-190000-
704 AM EDT Tue Aug 18 2026
.Synopsis for Massachusetts and Rhode Island coastal waters...
Winds become light out of the N/NE today with seas up to 3 feet over
the outer marine zones. Unsettled conditions make a return towards
Thu and Fri as a disturbance approaches the region and the waters.
$$
ANZ250-190000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds around 10 kt. Gusts up to 20 kt this morning.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and E 2 ft at
5 seconds. Patchy fog. Vsby 1 NM or less.
.TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and SE 4 ft at
9 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less
after midnight.
.WED...S winds around 5 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and
SE 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or
less.
.WED NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds and SW 2 ft at 4 seconds.
.THU...NW winds 5 to 10 kt, becoming E in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 6 seconds and SW 1 foot at
3 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at
8 seconds.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ251-190000-
Massachusetts Bay and Ipswich Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW
2 ft at 2 seconds and SE 2 ft at 7 seconds. Patchy fog this
morning with vsby 1 to 3 NM.
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and SE 2 ft at
10 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or
less after midnight.
.WED...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft
at 7 seconds and E 2 ft at 9 seconds. Patchy fog in the morning
with vsby 1 NM or less.
.WED NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and SW 1 foot at
3 seconds.
.THU...NW winds around 5 kt, becoming E in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at
2 seconds. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at
8 seconds. A chance of showers in the evening.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt, becoming E. Seas around
2 ft.
.SAT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
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.
$$
ANZ231-190000-
Cape Cod Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt. Gusts up to 20 kt this morning.
Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and SE 2 ft at
10 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to
3 NM this afternoon.
.TONIGHT...E winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 9 seconds and N 1 foot at
3 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less
after midnight.
.WED...SW winds around 5 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: NE
1 foot at 3 seconds and S 1 foot at 6 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave
Detail: SW 1 foot at 2 seconds and E 1 foot at 4 seconds.
.THU...NW winds around 5 kt, becoming NE in the afternoon. Seas
1 foot or less. Wave Detail: W 1 foot at 2 seconds and SE 1 foot
at 6 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
1 foot or less. Wave Detail: E 1 foot at 2 seconds and SW 1 foot
at 2 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt, becoming E. Seas 1 foot
or less.
.SAT...E winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas 1 foot or less. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ254-190000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SE 4 ft at 8 seconds and N 2 ft at 3 seconds.
Patchy fog. Vsby 1 NM or less.
.TONIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and S 3 ft at
7 seconds. Patchy fog. Vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 7 seconds and W 1 foot at 2 seconds. 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,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 6 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 6 seconds and W 1 foot at 3 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 4 seconds. A chance of
showers.
.FRI THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. A
chance of showers.
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.
$$
ANZ255-190000-
Coastal Waters extending out to 25 NM South of Marthas Vineyard
and Nantucket-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: S 4 ft at 7 seconds and E 3 ft at 15 seconds.
Patchy fog this morning with vsby 1 NM or less.
.TONIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 4 ft. Wave Detail: S 3 ft at 7 seconds and SE 3 ft at
8 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less
after midnight.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and SE 2 ft at
8 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and S
2 ft at 7 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and W 1 foot at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. A chance of
showers.
.FRI...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers
and tstms.
.FRI NIGHT AND SAT...NE winds 5 to 10 kt, becoming E 10 to 15 kt.
Seas 2 to 3 ft. A chance of showers.
.SAT NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft. Showers
likely.
Winds and seas higher in and near tstms.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ256-190000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 NM South of Block Island-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 5 to 10 kt with gusts up to 20 kt, becoming SW
this afternoon. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
11 seconds and S 3 ft at 7 seconds. Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas around 3 ft. Wave Detail: S
3 ft at 7 seconds and SE 2 ft at 8 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: W
2 ft at 3 seconds and SE 2 ft at 7 seconds.
.THU...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 5 seconds and SE 2 ft at 8 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SW 1 foot
at 4 seconds. A chance of showers.
.FRI THROUGH SAT...E winds 10 to 15 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...E winds 10 to 15 kt. Seas around 3 ft. Showers
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.
$$
ANZ232-190000-
Nantucket Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 4 seconds and S 1 foot at 7 seconds.
Patchy fog this morning with vsby 1 NM or less.
.TONIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: N 1 foot at 5 seconds and S 1 foot at
7 seconds. Patchy fog after midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot
at 2 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 1 foot at 4 seconds and
NE 1 foot at 4 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
1 foot at 3 seconds and SE 1 foot at 6 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E 1 foot at
8 seconds. A chance of showers.
.FRI...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 10 to 15 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ233-190000-
Vineyard Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds 5 to 10 kt. Gusts up to 20 kt this morning.
Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and SW 2 ft at
6 seconds. Patchy fog this morning.
.TONIGHT...SW winds around 5 kt. Seas around 2 ft. Wave Detail: S
2 ft at 7 seconds and NE 1 foot at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and E 1 foot
at 4 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 1 foot at 5 seconds
and NE 1 foot at 6 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 foot at 4 seconds and SW 1 foot at 5 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft in the evening, then 1 foot or less. Wave Detail: SW
2 ft at 5 seconds and SE 1 foot at 8 seconds, becoming SW 1 foot
at 4 seconds and S 1 foot at 7 seconds. A chance of showers.
.FRI...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
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.
$$
ANZ234-190000-
Buzzards Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds 5 to 10 kt. Gusts up to 20 kt this morning.
Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and SE 2 ft at
11 seconds. Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 9 seconds and NE 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: W 1 foot at 2 seconds and E 1 foot
at 4 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds
and NE 1 foot at 4 seconds.
.THU...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW
1 foot at 4 seconds and E 1 foot at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 1 foot or less. Wave Detail: E 1 foot at 2 seconds and SW
1 foot at 4 seconds. A chance of showers.
.FRI...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ235-190000-
Rhode Island Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 5 to 10 kt with gusts up to 20 kt, becoming S
this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds
and SE 3 ft at 12 seconds. Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and E 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds
and S 2 ft at 7 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 4 seconds and SE 2 ft at 7 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and S 2 ft at
8 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. Showers 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.
$$
ANZ237-190000-
Block Island Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 5 to 10 kt, becoming S this afternoon. Seas 2 to
3 ft. Wave Detail: S 3 ft at 7 seconds and SE 2 ft at 9 seconds.
Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 7 seconds and SE 2 ft at 8 seconds. Patchy fog after
midnight with vsby 1 to 3 NM.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 7 seconds and N 1 foot at 3 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft
at 7 seconds and W 1 foot at 2 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot
at 5 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ230-190000-
Boston Harbor-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds around 5 kt, becoming E 10 to 15 kt this
afternoon. Waves 1 foot or less. Patchy fog this morning with
vsby 1 to 3 NM.
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Waves
1 foot or less. Patchy fog after midnight with vsby 1 NM or less.
.WED...S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog in
the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.THU...NW winds around 5 kt, becoming E in the afternoon. Waves
1 foot or less. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt, becoming NW after midnight.
Waves 1 foot or less. A chance of showers in the evening.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less.
.SAT...E winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 foot or less. Showers
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.
$$
ANZ236-190000-
Narragansett Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds around 5 kt, becoming S 10 to 15 kt this
afternoon. Waves around 2 ft. Patchy fog this morning. A slight
chance of showers this afternoon.
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog
after midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog in the
morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.THU...W winds 5 to 10 kt. Waves around 2 ft in the morning, then
1 foot or less.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Waves around 2 ft in the evening, then 1 foot or less. A chance
of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less.
.SAT...E winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Waves around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ280-190000-
Ocean Waters from the Merrimack River to Plymouth from 40 to
60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft, building to 3 to 5 ft this afternoon. Wave Detail: N 2 ft
at 4 seconds and S 2 ft at 6 seconds, becoming S 5 ft at
8 seconds and NW 2 ft at 3 seconds. Patchy fog. Vsby 1 NM or
less.
.TONIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
4 to 5 ft. Wave Detail: SE 5 ft at 9 seconds and S 3 ft at
8 seconds. Patchy fog. Vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 8 seconds and SW 3 ft at 7 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.WED NIGHT...S winds 10 to 15 kt, becoming SW after midnight.
Gusts up to 20 kt. Seas around 3 ft. Wave Detail: SE 3 ft at
7 seconds and SW 1 foot at 3 seconds.
.THU...NW winds 5 to 10 kt, becoming NE in the afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and SE 2 ft at
8 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and SE 1 foot at
2 seconds.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...E winds around 10 kt. Seas 2 to 3 ft. Showers
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.
$$
ANZ281-190000-
Ocean Waters from Provincetown to Nantucket from 20 to 60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
6 ft. Wave Detail: S 5 ft at 7 seconds and SE 5 ft at 8 seconds.
Patchy fog. Vsby 1 NM or less.
.TONIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to around 5 kt after midnight. Seas 4 to 5 ft. Wave
Detail: SE 5 ft at 8 seconds and S 3 ft at 7 seconds. Patchy fog.
Vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft
at 7 seconds and NW 1 foot at 2 seconds. Patchy fog in the
morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 3 ft. Wave
Detail: S 3 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 7 seconds and W 1 foot at 3 seconds.
.THU NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 4 seconds. A chance of
showers. A chance of tstms after midnight.
.FRI...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...SE winds around 10 kt. Seas around 3 ft. Showers
likely.
Winds and seas higher in and near tstms.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ282-190000-
Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
5 ft. Wave Detail: S 5 ft at 7 seconds and SE 4 ft at 9 seconds.
Patchy fog. Vsby 1 NM or less.
.TONIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
3 to 4 ft. Wave Detail: S 3 ft at 7 seconds and SE 3 ft at
8 seconds. Patchy fog. Vsby 1 NM or less.
.WED...S winds 5 to 10 kt. Seas around 3 ft. Wave Detail: SE 3 ft
at 8 seconds and S 2 ft at 7 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and SW 1 foot at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 5 seconds. A chance of
showers and tstms.
.FRI...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT AND SAT...NE winds 5 to 10 kt, becoming E 10 to 15 kt.
Seas 2 to 3 ft. A chance of showers.
.SAT NIGHT...SE winds around 10 kt. Seas around 3 ft. Showers
likely.
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.
$$
ANZ283-190000-
Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt this afternoon. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 8 seconds and N 1 foot at 3 seconds. Patchy fog this
morning with vsby 1 to 3 NM.
.TONIGHT...SW winds around 5 kt. Seas 3 to 4 ft. Wave Detail: SE
3 ft at 8 seconds and N 1 foot at 3 seconds. Patchy fog. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.WED...SW winds 5 to 10 kt. Seas around 3 ft. Wave Detail: S 2 ft
at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 2 ft at 6 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 9 seconds and SW 1 foot at
5 seconds. A chance of tstms. A chance of showers in the evening,
then showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT AND SAT...E winds 10 to 15 kt. Seas 2 to 3 ft. A
chance of showers.
.SAT NIGHT...SE winds 10 to 15 kt. Seas around 3 ft. Showers
likely.
Winds and seas higher in and near tstms.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
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
CWFBOX
Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
704 AM EDT Tue Aug 18 2026
Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM
ANZ200-190000-
704 AM EDT Tue Aug 18 2026
.Synopsis for Massachusetts and Rhode Island coastal waters...
Winds become light out of the N/NE today with seas up to 3 feet over
the outer marine zones. Unsettled conditions make a return towards
Thu and Fri as a disturbance approaches the region and the waters.
$$
ANZ250-190000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds around 10 kt. Gusts up to 20 kt this morning.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and E 2 ft at
5 seconds. Patchy fog. Vsby 1 NM or less.
.TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and SE 4 ft at
9 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less
after midnight.
.WED...S winds around 5 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and
SE 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or
less.
.WED NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds and SW 2 ft at 4 seconds.
.THU...NW winds 5 to 10 kt, becoming E in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 6 seconds and SW 1 foot at
3 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at
8 seconds.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ251-190000-
Massachusetts Bay and Ipswich Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW
2 ft at 2 seconds and SE 2 ft at 7 seconds. Patchy fog this
morning with vsby 1 to 3 NM.
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and SE 2 ft at
10 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or
less after midnight.
.WED...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft
at 7 seconds and E 2 ft at 9 seconds. Patchy fog in the morning
with vsby 1 NM or less.
.WED NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and SW 1 foot at
3 seconds.
.THU...NW winds around 5 kt, becoming E in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at
2 seconds. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at
8 seconds. A chance of showers in the evening.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt, becoming E. Seas around
2 ft.
.SAT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
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.
$$
ANZ231-190000-
Cape Cod Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt. Gusts up to 20 kt this morning.
Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and SE 2 ft at
10 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to
3 NM this afternoon.
.TONIGHT...E winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 9 seconds and N 1 foot at
3 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less
after midnight.
.WED...SW winds around 5 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: NE
1 foot at 3 seconds and S 1 foot at 6 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave
Detail: SW 1 foot at 2 seconds and E 1 foot at 4 seconds.
.THU...NW winds around 5 kt, becoming NE in the afternoon. Seas
1 foot or less. Wave Detail: W 1 foot at 2 seconds and SE 1 foot
at 6 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
1 foot or less. Wave Detail: E 1 foot at 2 seconds and SW 1 foot
at 2 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt, becoming E. Seas 1 foot
or less.
.SAT...E winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas 1 foot or less. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ254-190000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SE 4 ft at 8 seconds and N 2 ft at 3 seconds.
Patchy fog. Vsby 1 NM or less.
.TONIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and S 3 ft at
7 seconds. Patchy fog. Vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 7 seconds and W 1 foot at 2 seconds. 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,
diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 6 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 6 seconds and W 1 foot at 3 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 4 seconds. A chance of
showers.
.FRI THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. A
chance of showers.
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.
$$
ANZ255-190000-
Coastal Waters extending out to 25 NM South of Marthas Vineyard
and Nantucket-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: S 4 ft at 7 seconds and E 3 ft at 15 seconds.
Patchy fog this morning with vsby 1 NM or less.
.TONIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 4 ft. Wave Detail: S 3 ft at 7 seconds and SE 3 ft at
8 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less
after midnight.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and SE 2 ft at
8 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and S
2 ft at 7 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and W 1 foot at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. A chance of
showers.
.FRI...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers
and tstms.
.FRI NIGHT AND SAT...NE winds 5 to 10 kt, becoming E 10 to 15 kt.
Seas 2 to 3 ft. A chance of showers.
.SAT NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft. Showers
likely.
Winds and seas higher in and near tstms.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ256-190000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 NM South of Block Island-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 5 to 10 kt with gusts up to 20 kt, becoming SW
this afternoon. Seas 3 to 4 ft. Wave Detail: SE 4 ft at
11 seconds and S 3 ft at 7 seconds. Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas around 3 ft. Wave Detail: S
3 ft at 7 seconds and SE 2 ft at 8 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: W
2 ft at 3 seconds and SE 2 ft at 7 seconds.
.THU...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 5 seconds and SE 2 ft at 8 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SW 1 foot
at 4 seconds. A chance of showers.
.FRI THROUGH SAT...E winds 10 to 15 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...E winds 10 to 15 kt. Seas around 3 ft. Showers
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.
$$
ANZ232-190000-
Nantucket Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 4 seconds and S 1 foot at 7 seconds.
Patchy fog this morning with vsby 1 NM or less.
.TONIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. Wave Detail: N 1 foot at 5 seconds and S 1 foot at
7 seconds. Patchy fog after midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot
at 2 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 1 foot at 4 seconds and
NE 1 foot at 4 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
1 foot at 3 seconds and SE 1 foot at 6 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E 1 foot at
8 seconds. A chance of showers.
.FRI...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 10 to 15 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ233-190000-
Vineyard Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds 5 to 10 kt. Gusts up to 20 kt this morning.
Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and SW 2 ft at
6 seconds. Patchy fog this morning.
.TONIGHT...SW winds around 5 kt. Seas around 2 ft. Wave Detail: S
2 ft at 7 seconds and NE 1 foot at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and E 1 foot
at 4 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 1 foot at 5 seconds
and NE 1 foot at 6 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
1 foot at 4 seconds and SW 1 foot at 5 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft in the evening, then 1 foot or less. Wave Detail: SW
2 ft at 5 seconds and SE 1 foot at 8 seconds, becoming SW 1 foot
at 4 seconds and S 1 foot at 7 seconds. A chance of showers.
.FRI...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
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.
$$
ANZ234-190000-
Buzzards Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds 5 to 10 kt. Gusts up to 20 kt this morning.
Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and SE 2 ft at
11 seconds. Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 9 seconds and NE 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: W 1 foot at 2 seconds and E 1 foot
at 4 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds
and NE 1 foot at 4 seconds.
.THU...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW
1 foot at 4 seconds and E 1 foot at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 1 foot or less. Wave Detail: E 1 foot at 2 seconds and SW
1 foot at 4 seconds. A chance of showers.
.FRI...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ235-190000-
Rhode Island Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 5 to 10 kt with gusts up to 20 kt, becoming S
this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds
and SE 3 ft at 12 seconds. Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and E 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds
and S 2 ft at 7 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 4 seconds and SE 2 ft at 7 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and S 2 ft at
8 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. Showers 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.
$$
ANZ237-190000-
Block Island Sound-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 5 to 10 kt, becoming S this afternoon. Seas 2 to
3 ft. Wave Detail: S 3 ft at 7 seconds and SE 2 ft at 9 seconds.
Patchy fog this morning.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 7 seconds and SE 2 ft at 8 seconds. Patchy fog after
midnight with vsby 1 to 3 NM.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 7 seconds and N 1 foot at 3 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft
at 7 seconds and W 1 foot at 2 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot
at 5 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 10 to 15 kt. Seas around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ230-190000-
Boston Harbor-
705 AM EDT Tue Aug 18 2026
.TODAY...NE winds around 5 kt, becoming E 10 to 15 kt this
afternoon. Waves 1 foot or less. Patchy fog this morning with
vsby 1 to 3 NM.
.TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Waves
1 foot or less. Patchy fog after midnight with vsby 1 NM or less.
.WED...S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog in
the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.THU...NW winds around 5 kt, becoming E in the afternoon. Waves
1 foot or less. A chance of showers in the afternoon.
.THU NIGHT...S winds around 5 kt, becoming NW after midnight.
Waves 1 foot or less. A chance of showers in the evening.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less.
.SAT...E winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Waves 1 foot or less. Showers
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.
$$
ANZ236-190000-
Narragansett Bay-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds around 5 kt, becoming S 10 to 15 kt this
afternoon. Waves around 2 ft. Patchy fog this morning. A slight
chance of showers this afternoon.
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog
after midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog in the
morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.THU...W winds 5 to 10 kt. Waves around 2 ft in the morning, then
1 foot or less.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Waves around 2 ft in the evening, then 1 foot or less. A chance
of showers.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less.
.SAT...E winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.SAT NIGHT...E winds 5 to 10 kt. Waves around 2 ft. Showers
likely.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ280-190000-
Ocean Waters from the Merrimack River to Plymouth from 40 to
60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft, building to 3 to 5 ft this afternoon. Wave Detail: N 2 ft
at 4 seconds and S 2 ft at 6 seconds, becoming S 5 ft at
8 seconds and NW 2 ft at 3 seconds. Patchy fog. Vsby 1 NM or
less.
.TONIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
4 to 5 ft. Wave Detail: SE 5 ft at 9 seconds and S 3 ft at
8 seconds. Patchy fog. Vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 8 seconds and SW 3 ft at 7 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.WED NIGHT...S winds 10 to 15 kt, becoming SW after midnight.
Gusts up to 20 kt. Seas around 3 ft. Wave Detail: SE 3 ft at
7 seconds and SW 1 foot at 3 seconds.
.THU...NW winds 5 to 10 kt, becoming NE in the afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and SE 2 ft at
8 seconds.
.THU NIGHT...S winds around 5 kt, becoming W after midnight. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and SE 1 foot at
2 seconds.
.FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...E winds around 10 kt. Seas 2 to 3 ft. Showers
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.
$$
ANZ281-190000-
Ocean Waters from Provincetown to Nantucket from 20 to 60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
6 ft. Wave Detail: S 5 ft at 7 seconds and SE 5 ft at 8 seconds.
Patchy fog. Vsby 1 NM or less.
.TONIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to around 5 kt after midnight. Seas 4 to 5 ft. Wave
Detail: SE 5 ft at 8 seconds and S 3 ft at 7 seconds. Patchy fog.
Vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft
at 7 seconds and NW 1 foot at 2 seconds. Patchy fog in the
morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 3 ft. Wave
Detail: S 3 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 7 seconds and W 1 foot at 3 seconds.
.THU NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 4 seconds. A chance of
showers. A chance of tstms after midnight.
.FRI...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...SE winds around 10 kt. Seas around 3 ft. Showers
likely.
Winds and seas higher in and near tstms.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ282-190000-
Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
5 ft. Wave Detail: S 5 ft at 7 seconds and SE 4 ft at 9 seconds.
Patchy fog. Vsby 1 NM or less.
.TONIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
3 to 4 ft. Wave Detail: S 3 ft at 7 seconds and SE 3 ft at
8 seconds. Patchy fog. Vsby 1 NM or less.
.WED...S winds 5 to 10 kt. Seas around 3 ft. Wave Detail: SE 3 ft
at 8 seconds and S 2 ft at 7 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and SW 1 foot at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 5 seconds. A chance of
showers and tstms.
.FRI...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT AND SAT...NE winds 5 to 10 kt, becoming E 10 to 15 kt.
Seas 2 to 3 ft. A chance of showers.
.SAT NIGHT...SE winds around 10 kt. Seas around 3 ft. Showers
likely.
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.
$$
ANZ283-190000-
Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM-
705 AM EDT Tue Aug 18 2026
.TODAY...N winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt this afternoon. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 8 seconds and N 1 foot at 3 seconds. Patchy fog this
morning with vsby 1 to 3 NM.
.TONIGHT...SW winds around 5 kt. Seas 3 to 4 ft. Wave Detail: SE
3 ft at 8 seconds and N 1 foot at 3 seconds. Patchy fog. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.WED...SW winds 5 to 10 kt. Seas around 3 ft. Wave Detail: S 2 ft
at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.WED NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
SE 2 ft at 6 seconds and SW 1 foot at 3 seconds.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and SW 1 foot at 3 seconds.
.THU NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 9 seconds and SW 1 foot at
5 seconds. A chance of tstms. A chance of showers in the evening,
then showers likely after midnight.
.FRI...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers
and tstms.
.FRI NIGHT AND SAT...E winds 10 to 15 kt. Seas 2 to 3 ft. A
chance of showers.
.SAT NIGHT...SE winds 10 to 15 kt. Seas around 3 ft. Showers
likely.
Winds and seas higher in and near tstms.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
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