Coastal Waters Forecast
Issued by NWS Boston, MA

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

164
FZUS51 KBOX 191501
CWFBOX

Coastal Waters Forecast
National Weather Service Boston/Norton MA
1101 AM EDT Sat May 19 2018

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

ANZ200-200415-
1101 AM EDT Sat May 19 2018

.Synopsis for Massachusetts and Rhode Island coastal waters...
A warm front will move N across the waters today. Expecting steady
rainfall to limit vsbys. A passing cold front Sun afternoon could
trigger a thunderstorm or two across the nearshore waters. Dry
weather returns on Mon. A low pres passing by Tue into Wed could
produce some showers.

For information on possible hazardous weather beyond the 24-36
hour forecast period, please visit www.weather.gov/boston and
follow the Current Hazards link above the map on the left.

$$

ANZ250-200415-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 2 to 4 ft. A slight
chance of rain early, then rain. Patchy fog with vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt, increasing to
30 kt after midnight. Seas 3 to 5 ft. Patchy fog. A chance of
rain. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft.
.MON...W winds around 5 kt, becoming SW in the afternoon. Seas
2 to 3 ft.
.MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 2 to 3 ft.
.TUE...SE winds 5 to 10 kt. Seas 2 to 3 ft.
.TUE NIGHT...S winds 10 to 15 kt. Seas 2 to 4 ft. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
.WED NIGHT...N winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to
5 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ251-200415-
Massachusetts Bay and Ipswich Bay-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY MORNING...

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 2 to 3 ft. A slight
chance of rain early, then rain. Patchy fog with vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 30 kt after midnight.
Seas 2 to 4 ft. Patchy fog. Rain likely. Vsby 1 NM or less.
.SUN...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to
4 ft. Patchy fog. Showers likely. Vsby 1 NM or less.
.SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.MON...W winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft.
.MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft.
.TUE...SE winds 5 to 10 kt. Seas around 2 ft.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.WED...W winds around 5 kt. Seas 2 to 3 ft. A chance of showers.
.WED NIGHT...N winds 5 to 10 kt. Seas 2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ231-200415-
Cape Cod Bay-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 5 to 10 kt. Seas around 2 ft. Patchy
fog. A slight chance of rain early, then rain with vsby 1 to
3 NM.
.TONIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 30 kt after midnight. Seas 2 to 4 ft. Patchy fog. Rain
likely. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Seas
1 foot or less.
.MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
1 foot or less.
.TUE...SE winds 5 to 10 kt. Seas 1 foot or less.
.TUE NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.WED NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas
2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ254-200415-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt with gusts up to 20 kt.
Seas around 4 ft. Patchy fog. A slight chance of rain early, then
rain. Vsby 1 to 3 NM, decreasing to 1 NM or less.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 30 kt after midnight.
Seas 4 to 6 ft. Patchy fog. A chance of rain. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
7 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming
NW 5 to 10 kt after midnight. Seas 3 to 5 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Seas
2 to 4 ft.
.MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft.
.TUE...S winds 5 to 10 kt. Seas 2 to 3 ft.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
.WED NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas
3 to 5 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ255-200415-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft. Patchy fog. A chance of rain early, then rain
likely. Vsby 1 to 3 NM, decreasing to 1 NM or less.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW 15 to 20 kt with gusts up to 30 kt after midnight. Seas 4 to
6 ft. Patchy dense fog. A chance of rain. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to
8 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming
NW 5 to 10 kt after midnight. Seas 4 to 7 ft. Patchy fog.
.MON...N winds around 5 kt, becoming SW in the afternoon. Seas
3 to 5 ft.
.MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft.
.TUE...SE winds 5 to 10 kt. Seas 2 to 3 ft.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.WED...W winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
.WED NIGHT...NW winds around 10 kt with gusts up to 25 kt. Seas
3 to 5 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ256-200415-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft. Patchy fog. Rain. Vsby 1 to 3 NM, decreasing to
1 NM or less.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW 15 to 20 kt with gusts up to 30 kt after midnight. Seas 4 to
6 ft. Patchy fog. A chance of rain. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to
8 ft. Patchy fog. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming
NW 5 to 10 kt after midnight. Seas 5 to 8 ft.
.MON...N winds 5 to 10 kt, becoming SW in the afternoon. Seas
3 to 5 ft.
.MON NIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. A chance of
showers.
.TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers.
.WED NIGHT...NW winds around 10 kt with gusts up to 20 kt. Seas
3 to 5 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ232-200415-
Nantucket Sound-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt. Gusts up to 20 kt early.
Seas 2 to 3 ft. Patchy fog. A chance of rain early, then rain.
Vsby 1 to 3 NM, decreasing to 1 NM or less.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt, increasing to
30 kt after midnight. Seas 2 to 4 ft. Patchy dense fog. A chance
of rain. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming
N around 5 kt after midnight. Seas 2 to 4 ft. Patchy fog. Vsby
1 to 3 NM.
.MON...N winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft.
.MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. A chance of showers.
.TUE...SE winds 5 to 10 kt. Seas 1 foot or less.
.TUE NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.WED NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas
2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ233-200415-
Vineyard Sound-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds around 10 kt. Seas around 2 ft. Patchy
fog. Rain. Vsby 1 to 3 NM, decreasing to 1 NM or less.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW 15 to 20 kt with gusts up to 30 kt after midnight. Seas 2 to
4 ft. Patchy fog. Rain likely. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW 5 to 10 kt after midnight. Seas 2 to 4 ft. Patchy fog.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Seas
2 to 3 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.TUE...SE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.TUE NIGHT...S winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.WED NIGHT...NW winds around 10 kt with gusts up to 20 kt. Seas
2 to 3 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ234-200415-
Buzzards Bay-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 5 to 10 kt. Gusts up to 20 kt early.
Seas 1 foot or less. Patchy fog. A chance of rain early, then
rain. Vsby 1 to 3 NM, decreasing to 1 NM or less.
.TONIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 30 kt after midnight. Seas 2 to 4 ft. Patchy fog. A chance
of rain. Vsby 1 NM or less.
.SUN...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to
4 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming
N after midnight. Seas 2 to 3 ft.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft.
.MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. A chance of showers.
.TUE...SE winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.TUE NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.WED NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas
around 2 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ235-200415-
Rhode Island Sound-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 to 3 NM, decreasing to
1 NM or less.
.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming
SW 15 to 20 kt with gusts up to 30 kt after midnight. Seas 3 to
5 ft. Patchy fog. Rain likely. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
6 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW 5 to 10 kt after midnight. Seas 4 to 6 ft.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Seas
3 to 5 ft.
.MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.TUE...SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.WED NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas
2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ237-200415-
Block Island Sound-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 to 3 NM, decreasing to
1 NM or less.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt, increasing to
30 kt after midnight. Seas 3 to 5 ft. Patchy fog. A chance of
rain. Vsby 1 NM or less.
.SUN...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. Patchy fog. A
chance of showers. Vsby 1 NM or less.
.SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming
NW 5 to 10 kt after midnight. Seas 3 to 5 ft.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Seas
2 to 4 ft.
.MON NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers.
.TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.TUE NIGHT...S winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.WED NIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas
2 to 4 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ230-200415-
Boston Harbor-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY MORNING...

.THIS AFTERNOON...E winds around 10 kt. Waves 2 to 3 ft. A slight
chance of rain early, then rain. Patchy fog with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt. Gusts up to 25 kt after midnight.
Waves around 2 ft. Patchy fog. A chance of rain. Vsby 1 NM or
less.
.SUN...SW winds around 10 kt with gusts up to 25 kt. Waves around
2 ft. A chance of showers.
.SUN NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.MON...W winds around 5 kt, becoming SW in the afternoon. Waves
1 foot or less.
.MON NIGHT...W winds around 5 kt, becoming NW after midnight.
Waves 1 foot or less.
.TUE...SE winds around 5 kt. Waves 1 foot or less.
.TUE NIGHT...SW winds around 5 kt. Waves 1 foot or less. A chance
of showers.
.WED...W winds around 5 kt. Waves 1 foot or less. A chance of
showers.
.WED NIGHT...N winds around 5 kt. Waves 1 foot or less.

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.

$$

ANZ236-200415-
Narragansett Bay-
1101 AM EDT Sat May 19 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

.THIS AFTERNOON...E winds 5 to 10 kt. Gusts up to 20 kt early.
Waves 2 to 3 ft. Patchy fog. Rain. Vsby 1 to 3 NM, decreasing to
1 NM or less.
.TONIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts
up to 30 kt after midnight. Waves 2 to 4 ft. Patchy fog. A chance
of rain. Vsby 1 NM or less.
.SUN...SW winds 10 to 15 kt with gusts up to 30 kt. Waves 2 to
4 ft. Patchy fog. A chance of showers. Vsby 1 NM or less.
.SUN NIGHT...NW winds 5 to 10 kt. Waves 2 to 3 ft.
.MON...NW winds around 5 kt, becoming SW in the afternoon. Waves
2 to 3 ft.
.MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight.
Waves 2 to 3 ft. A chance of showers.
.TUE...SE winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.TUE NIGHT...S winds around 5 kt. Waves around 2 ft. A chance of
showers.
.WED...W winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers.
.WED NIGHT...NW winds around 5 kt. Waves 2 to 3 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

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

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.