FZUS51 KBOX 181103
CWFBOX
Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
703 AM EDT Sun May 18 2025
Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM
ANZ200-190000-
703 AM EDT Sun May 18 2025
.Synopsis for Massachusetts and Rhode Island coastal waters...
Upper level low pres gradually builds over the waters through Mon,
which will bring increased W to NW breezes and hit or miss showers.
High pres then builds in from the Canadian Maritimes through
midweek, with increased onshore flow. Monitoring a potential coastal
gale that could bring enhanced northeast winds and periods of rain
late in the week.
$$
ANZ250-190000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: W 2 ft at 3 seconds and SE 2 ft at 7 seconds.
Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, increasing
to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 2 to
4 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at 8 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
4 ft. Wave Detail: NW 4 ft at 4 seconds and SE 2 ft at 8 seconds.
.MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: N 4 ft at 6 seconds and SE 1 foot at
9 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Wave Detail: N 3 ft at 5 seconds and SE 1 foot at
9 seconds.
.WED...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
5 ft. Wave Detail: NE 3 ft at 7 seconds and SE 1 foot at
10 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...E winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Showers likely. Vsby 1 to 3 NM.
.THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas
9 to 10 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ251-190000-
Massachusetts Bay and Ipswich Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: W 1 foot at 3 seconds and E 1 foot at
6 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft
at 3 seconds and E 1 foot at 5 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at
5 seconds.
.MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 5 seconds and SE 1 foot at
9 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: NE 3 ft at 6 seconds and NW 2 ft at
3 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: NE 3 ft at 7 seconds and SE 1 foot at
9 seconds. A chance of showers.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...E winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Showers likely. Vsby 1 to 3 NM.
.THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
8 to 10 ft. Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ231-190000-
Cape Cod Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: SE 2 ft at 6 seconds and W 1 foot at
3 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at 8 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at
5 seconds.
.MON NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 6 seconds and SE 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: N 3 ft at 6 seconds and SE 1 foot at
8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 5 seconds and SE 1 foot at
9 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt.
Seas 5 to 8 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ254-190000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft, building to 3 to
5 ft this afternoon. Wave Detail: S 3 ft at 7 seconds and W
1 foot at 3 seconds, becoming S 4 ft at 7 seconds and W 1 foot at
3 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: S 4 ft at 8 seconds and W 2 ft at 4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: NW 4 ft at 4 seconds and S 3 ft at 8 seconds.
.MON NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: NW 3 ft at 5 seconds and S 2 ft at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 4 to 5 ft. Wave Detail: N 3 ft at 6 seconds and S 1 foot at
8 seconds.
.WED...NE winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: NE 3 ft
at 7 seconds and W 1 foot at 5 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
5 to 7 ft. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 7 to 10 ft. Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ255-190000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW
5 ft at 7 seconds and W 1 foot at 3 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
5 ft. Wave Detail: SW 5 ft at 7 seconds and W 1 foot at
4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: W 5 ft at 7 seconds and SW 5 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: W 4 ft at 6 seconds and NE 1 foot at
6 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 6 seconds and S 1 foot at
8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: NE 3 ft at 4 seconds and SW 1 foot at
6 seconds. A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely.
.THU AND THU NIGHT...E winds 20 to 25 kt, becoming NE 15 to
20 kt. Gusts up to 30 kt. Seas 6 to 9 ft. Showers. Vsby 1 to
3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ256-190000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, increasing to 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW
5 ft at 7 seconds and W 1 foot at 3 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: W 5 ft at 6 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: NW 5 ft at 6 seconds and S 4 ft at 8 seconds.
.MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: NW 4 ft at 5 seconds and S 2 ft at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds and S 1 foot at
8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: E 3 ft at 4 seconds and S 1 foot at 9 seconds.
A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely.
Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 6 to 9 ft. Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ232-190000-
Nantucket Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW
3 ft at 4 seconds and SE 2 ft at 6 seconds.
.TONIGHT...W winds around 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: W 3 ft at 4 seconds and S 2 ft at 8 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: W 2 ft at 4 seconds and S 1 foot at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: NW 2 ft at 3 seconds and NE 1 foot
at 6 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at
5 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of showers. Vsby 1 to 3 NM.
.THU AND THU NIGHT...E winds 20 to 25 kt, becoming NE 15 to
20 kt. Seas 4 to 6 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ233-190000-
Vineyard Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW
4 ft at 6 seconds. Isolated showers this afternoon.
.TONIGHT...W winds around 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 4 ft at 6 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 5 seconds and SW 3 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 5 seconds and S 1 foot at 8 seconds.
.WED...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 SW 1 foot at
5 seconds. A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 2 to 4 ft. Showers likely.
Vsby 1 to 3 NM.
.THU AND THU NIGHT...E winds 20 to 25 kt, becoming NE 15 to
20 kt. Seas 3 to 5 ft. Showers. Vsby 1 to 3 NM.
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.
$$
ANZ234-190000-
Buzzards Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 6 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 8 seconds and SW 2 ft at 5 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 5 seconds and SW 2 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 4 seconds and S 1 foot at 8 seconds.
.WED...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: NE 1 foot at 2 seconds and S 1 foot at
9 seconds. A chance of showers.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. A chance of showers. Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 20 to 25 kt, diminishing to 15 to
20 kt. Gusts up to 30 kt. Seas 4 to 6 ft. Showers. Vsby 1 to
3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ235-190000-
Rhode Island Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 4 ft at 7 seconds and W 2 ft at 4 seconds.
Isolated showers this afternoon.
.TONIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: S 5 ft at 7 seconds and W 2 ft at 4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Wave Detail: SW 4 ft at 7 seconds and NW 3 ft at 4 seconds.
.MON NIGHT...NW winds around 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and S 2 ft at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and S 1 foot
at 8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at
9 seconds. A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 3 to 5 ft. Showers likely.
Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 20 to 25 kt, diminishing to 15 to
20 kt. Seas 5 to 7 ft. Showers. Vsby 1 to 3 NM.
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.
$$
ANZ237-190000-
Block Island Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 7 seconds and W 2 ft at 4 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 8 seconds and W 2 ft at 4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Wave Detail: W 3 ft at 4 seconds and S 3 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and S 1 foot at
8 seconds.
.TUE...N winds 10 to 15 kt, diminishing to 5 to 10 kt in the
afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and
S 1 foot at 8 seconds.
.TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
W 1 foot at 2 seconds and NE 1 foot at 3 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of showers.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Showers likely. Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 5 to 7 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ230-190000-
Boston Harbor-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 25 kt. Waves 1 foot
or less, then around 2 ft this afternoon. Scattered showers this
afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves
around 2 ft.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Waves around
2 ft.
.MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Waves around 2 ft.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Waves around 2 ft.
.WED AND WED NIGHT...E winds 10 to 15 kt, increasing to 15 to
20 kt. Waves 2 to 3 ft. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Waves 2 to 3 ft, except 5 to 7 ft at the outer harbor entrance.
Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ236-190000-
Narragansett Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to
3 ft. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to
3 ft.
.MON...NW winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to
3 ft.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 3 ft.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.WED...NE winds 10 to 15 kt. Waves 2 to 3 ft. A chance of
showers.
.WED NIGHT THROUGH THU NIGHT...N winds 15 to 20 kt with gusts up
to 25 kt. Waves 2 to 3 ft, except 4 to 6 ft at the bay entrance.
Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
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CWFBOX
Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
703 AM EDT Sun May 18 2025
Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM
ANZ200-190000-
703 AM EDT Sun May 18 2025
.Synopsis for Massachusetts and Rhode Island coastal waters...
Upper level low pres gradually builds over the waters through Mon,
which will bring increased W to NW breezes and hit or miss showers.
High pres then builds in from the Canadian Maritimes through
midweek, with increased onshore flow. Monitoring a potential coastal
gale that could bring enhanced northeast winds and periods of rain
late in the week.
$$
ANZ250-190000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: W 2 ft at 3 seconds and SE 2 ft at 7 seconds.
Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, increasing
to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 2 to
4 ft. Wave Detail: W 3 ft at 4 seconds and SE 2 ft at 8 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
4 ft. Wave Detail: NW 4 ft at 4 seconds and SE 2 ft at 8 seconds.
.MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: N 4 ft at 6 seconds and SE 1 foot at
9 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Wave Detail: N 3 ft at 5 seconds and SE 1 foot at
9 seconds.
.WED...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
5 ft. Wave Detail: NE 3 ft at 7 seconds and SE 1 foot at
10 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...E winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Showers likely. Vsby 1 to 3 NM.
.THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas
9 to 10 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ251-190000-
Massachusetts Bay and Ipswich Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: W 1 foot at 3 seconds and E 1 foot at
6 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft
at 3 seconds and E 1 foot at 5 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at
5 seconds.
.MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 5 seconds and SE 1 foot at
9 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: NE 3 ft at 6 seconds and NW 2 ft at
3 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: NE 3 ft at 7 seconds and SE 1 foot at
9 seconds. A chance of showers.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of showers.
.THU...E winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to
9 ft. Showers likely. Vsby 1 to 3 NM.
.THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
8 to 10 ft. Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ231-190000-
Cape Cod Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: SE 2 ft at 6 seconds and W 1 foot at
3 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at 8 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at
5 seconds.
.MON NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 6 seconds and SE 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: N 3 ft at 6 seconds and SE 1 foot at
8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 5 seconds and SE 1 foot at
9 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt.
Seas 5 to 8 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ254-190000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft, building to 3 to
5 ft this afternoon. Wave Detail: S 3 ft at 7 seconds and W
1 foot at 3 seconds, becoming S 4 ft at 7 seconds and W 1 foot at
3 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: S 4 ft at 8 seconds and W 2 ft at 4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: NW 4 ft at 4 seconds and S 3 ft at 8 seconds.
.MON NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: NW 3 ft at 5 seconds and S 2 ft at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 4 to 5 ft. Wave Detail: N 3 ft at 6 seconds and S 1 foot at
8 seconds.
.WED...NE winds 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: NE 3 ft
at 7 seconds and W 1 foot at 5 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
5 to 7 ft. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 7 to 10 ft. Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ255-190000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW
5 ft at 7 seconds and W 1 foot at 3 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
5 ft. Wave Detail: SW 5 ft at 7 seconds and W 1 foot at
4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: W 5 ft at 7 seconds and SW 5 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: W 4 ft at 6 seconds and NE 1 foot at
6 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 6 seconds and S 1 foot at
8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: NE 3 ft at 4 seconds and SW 1 foot at
6 seconds. A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely.
.THU AND THU NIGHT...E winds 20 to 25 kt, becoming NE 15 to
20 kt. Gusts up to 30 kt. Seas 6 to 9 ft. Showers. Vsby 1 to
3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ256-190000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, increasing to 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW
5 ft at 7 seconds and W 1 foot at 3 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: W 5 ft at 6 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: NW 5 ft at 6 seconds and S 4 ft at 8 seconds.
.MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: NW 4 ft at 5 seconds and S 2 ft at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds and S 1 foot at
8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: E 3 ft at 4 seconds and S 1 foot at 9 seconds.
A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely.
Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 6 to 9 ft. Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ232-190000-
Nantucket Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW
3 ft at 4 seconds and SE 2 ft at 6 seconds.
.TONIGHT...W winds around 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: W 3 ft at 4 seconds and S 2 ft at 8 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: W 2 ft at 4 seconds and S 1 foot at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: NW 2 ft at 3 seconds and NE 1 foot
at 6 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at
5 seconds.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of showers. Vsby 1 to 3 NM.
.THU AND THU NIGHT...E winds 20 to 25 kt, becoming NE 15 to
20 kt. Seas 4 to 6 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ233-190000-
Vineyard Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW
4 ft at 6 seconds. Isolated showers this afternoon.
.TONIGHT...W winds around 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 4 ft at 6 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: NW 3 ft at 5 seconds and SW 3 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 5 seconds and S 1 foot at 8 seconds.
.WED...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 SW 1 foot at
5 seconds. A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 2 to 4 ft. Showers likely.
Vsby 1 to 3 NM.
.THU AND THU NIGHT...E winds 20 to 25 kt, becoming NE 15 to
20 kt. Seas 3 to 5 ft. Showers. Vsby 1 to 3 NM.
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.
$$
ANZ234-190000-
Buzzards Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt, becoming SW 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft
at 6 seconds. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 8 seconds and SW 2 ft at 5 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: N 2 ft at 5 seconds and SW 2 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: N 2 ft at 5 seconds and S 1 foot at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: N 2 ft at 4 seconds and S 1 foot at 8 seconds.
.WED...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: NE 1 foot at 2 seconds and S 1 foot at
9 seconds. A chance of showers.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. A chance of showers. Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 20 to 25 kt, diminishing to 15 to
20 kt. Gusts up to 30 kt. Seas 4 to 6 ft. Showers. Vsby 1 to
3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ235-190000-
Rhode Island Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 4 ft at 7 seconds and W 2 ft at 4 seconds.
Isolated showers this afternoon.
.TONIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: S 5 ft at 7 seconds and W 2 ft at 4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Wave Detail: SW 4 ft at 7 seconds and NW 3 ft at 4 seconds.
.MON NIGHT...NW winds around 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and S 2 ft at
8 seconds.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and S 1 foot
at 8 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at
9 seconds. A chance of showers.
.WED NIGHT...E winds 20 to 25 kt. Seas 3 to 5 ft. Showers likely.
Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 20 to 25 kt, diminishing to 15 to
20 kt. Seas 5 to 7 ft. Showers. Vsby 1 to 3 NM.
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.
$$
ANZ237-190000-
Block Island Sound-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 7 seconds and W 2 ft at 4 seconds.
.TONIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 8 seconds and W 2 ft at 4 seconds.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Wave Detail: W 3 ft at 4 seconds and S 3 ft at 8 seconds.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and S 1 foot at
8 seconds.
.TUE...N winds 10 to 15 kt, diminishing to 5 to 10 kt in the
afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and
S 1 foot at 8 seconds.
.TUE NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
W 1 foot at 2 seconds and NE 1 foot at 3 seconds.
.WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of showers.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Showers likely. Vsby 1 to 3 NM.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 5 to 7 ft. Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
ANZ230-190000-
Boston Harbor-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 25 kt. Waves 1 foot
or less, then around 2 ft this afternoon. Scattered showers this
afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves
around 2 ft.
.MON...NW winds 15 to 20 kt with gusts up to 30 kt. Waves around
2 ft.
.MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Waves around 2 ft.
.TUE AND TUE NIGHT...NE winds 10 to 15 kt. Waves around 2 ft.
.WED AND WED NIGHT...E winds 10 to 15 kt, increasing to 15 to
20 kt. Waves 2 to 3 ft. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt.
Waves 2 to 3 ft, except 5 to 7 ft at the outer harbor entrance.
Showers likely. Vsby 1 to 3 NM.
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.
$$
ANZ236-190000-
Narragansett Bay-
703 AM EDT Sun May 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
MONDAY EVENING...
.TODAY...W winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to
3 ft. Isolated showers this afternoon.
.TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to
3 ft.
.MON...NW winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to
3 ft.
.MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 3 ft.
.TUE AND TUE NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.WED...NE winds 10 to 15 kt. Waves 2 to 3 ft. A chance of
showers.
.WED NIGHT THROUGH THU NIGHT...N winds 15 to 20 kt with gusts up
to 25 kt. Waves 2 to 3 ft, except 4 to 6 ft at the bay entrance.
Showers likely. Vsby 1 to 3 NM.
Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.
$$
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