Coastal Waters Forecast
Issued by NWS Boston, MA

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000
FZUS51 KBOX 040038
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
837 PM EDT Mon Aug 3 2020

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

ANZ200-041300-
837 PM EDT Mon Aug 3 2020

.Synopsis for Massachusetts and Rhode Island coastal waters...
With high pressure sitting east of the waters our main focus will
turn to Tropical Storm Isaias as our region remains in the cone of
uncertainty Tue into early Wed. Mariners are urged to visit
www.nhc.noaa.gov for the latest forecasts regarding this storm. High
pres will build back across the waters Wed into Thu.

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.

$$

ANZ250-041300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft.
.TUE...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 4 ft.
.TUE NIGHT...S winds 30 to 35 kt with gusts up to 50 kt. Seas
4 to 6 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 30 kt, becoming S
10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 4 to
7 ft. A chance of showers.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 3 to 5 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft.
.FRI THROUGH SAT NIGHT...SW winds around 5 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.

$$

ANZ251-041300-
Massachusetts Bay and Ipswich Bay-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...W winds 5 to 10 kt, becoming SW after midnight. Seas
2 to 3 ft. A slight chance of showers after midnight.
.TUE...SE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 3 ft. A chance of
showers. Vsby 1 to 3 NM.
.TUE NIGHT...S winds 30 to 35 kt with gusts up to 50 kt. Seas
3 to 5 ft. Showers likely. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 25 kt, diminishing
to 10 to 15 kt in the afternoon. Seas 2 to 4 ft. A chance of
showers. Vsby 1 to 3 NM.
.WED NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
2 to 3 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.FRI THROUGH SAT NIGHT...SW winds 5 to 10 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.

$$

ANZ231-041300-
Cape Cod Bay-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 2 ft. A
slight chance of showers with isolated tstms after midnight.
.TUE...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas around 2 ft.
.TUE NIGHT...S winds 25 to 30 kt, diminishing to 15 to 20 kt
after midnight. Seas 3 to 5 ft. A chance of showers. Vsby 1 to
3 NM.
.WED...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. A chance of
showers.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas around 2 ft.
.FRI THROUGH SAT...E winds around 5 kt. Seas 1 foot or less.
.SAT NIGHT...SW winds around 5 kt. Seas around 2 ft. Patchy fog.
Vsby 1 to 3 NM.

Winds and seas higher in and near tstms.

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

$$

ANZ254-041300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft.
.TUE...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 4 ft.
.TUE NIGHT...S winds 20 to 25 kt with gusts up to 35 kt. Seas
4 to 7 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 30 kt, diminishing
to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 5 to
8 ft. A chance of showers.
.WED NIGHT AND THU...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 4 to 6 ft.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 2 to 4 ft.
.FRI...NE winds around 5 kt. Seas 2 to 4 ft.
.FRI NIGHT...SE winds around 5 kt. Seas 2 to 3 ft. A chance of
showers.
.SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
.SAT NIGHT...E winds around 5 kt. Seas 2 to 3 ft. Patchy fog.
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.

$$

ANZ255-041300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft.
.TUE...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 30 kt in the afternoon. Seas 3 to 5 ft.
.TUE NIGHT...S winds 20 to 25 kt. Gusts up to 45 kt, decreasing
to 35 kt after midnight. Seas 6 to 9 ft. A chance of showers.
Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 6 to 9 ft. A chance of
showers.
.WED NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Seas 4 to 7 ft.
.THU...N winds around 5 kt, becoming SW in the afternoon. Seas
3 to 5 ft.
.THU NIGHT...SW winds around 5 kt, becoming W after midnight.
Seas 2 to 4 ft. A chance of showers.
.FRI...NE winds around 5 kt. Seas 2 to 3 ft.
.FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...NE winds 5 to 10 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.

$$

ANZ256-041300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft. A
slight chance of showers with isolated tstms after midnight with
vsby 1 to 3 NM.
.TUE...S winds 10 to 15 kt, becoming SE 15 to 20 kt with gusts up
to 35 kt in the afternoon. Seas 4 to 7 ft.
.TUE NIGHT...S winds 25 to 35 kt with gusts up to 50 kt,
diminishing to 20 to 25 kt with gusts up to 40 kt after midnight.
Seas 8 to 11 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 30 kt, diminishing
to 10 to 15 kt in the afternoon. Seas 7 to 10 ft. A chance of
showers.
.WED NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Seas 4 to 6 ft.
.THU...N winds 5 to 10 kt, becoming S in the afternoon. Seas 3 to
4 ft.
.THU NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 3 ft. A chance of showers.
.FRI...NE winds around 5 kt. Seas 2 to 3 ft.
.FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. A chance
of showers.
.SAT NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby
1 to 3 NM.

Winds and seas higher in and near tstms.

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

$$

ANZ232-041300-
Nantucket Sound-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...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. A
slight chance of showers with isolated tstms after midnight with
vsby 1 to 3 NM.
.TUE...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 25 kt in the afternoon. Seas 2 to 3 ft.
.TUE NIGHT...S winds 20 to 25 kt with gusts up to 40 kt,
diminishing to 15 to 20 kt with gusts up to 30 kt after midnight.
Seas 3 to 5 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. A chance of
showers.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas around 2 ft.
.FRI...E winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT...SE winds around 5 kt. Seas around 2 ft. A chance of
showers.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

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

$$

ANZ233-041300-
Vineyard Sound-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...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. A
slight chance of showers with isolated tstms after midnight with
vsby 1 to 3 NM.
.TUE...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 4 ft. A chance of showers.
.TUE NIGHT...S winds 25 to 30 kt with gusts up to 45 kt,
diminishing to around 20 kt with gusts up to 35 kt after
midnight. Seas 4 to 7 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 4 to 7 ft. A chance of
showers.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.FRI...NE winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT...E winds around 5 kt. Seas around 2 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Patchy fog.
Vsby 1 to 3 NM.

Winds and seas higher in and near tstms.

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

$$

ANZ234-041300-
Buzzards Bay-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...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. A
slight chance of showers with isolated tstms after midnight.
.TUE...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 25 kt in the afternoon. Seas 2 to 3 ft. A chance of showers.
.TUE NIGHT...S winds 30 to 35 kt with gusts up to 45 kt,
diminishing to 15 to 20 kt with gusts up to 30 kt after midnight.
Seas 4 to 6 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. A chance of showers.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.FRI...NE winds 5 to 10 kt. Seas 1 foot or less.
.FRI NIGHT...E winds around 5 kt. Seas 1 foot or less. Patchy
fog. A chance of showers. Vsby 1 to 3 NM.
.SAT...E winds 5 to 10 kt. Seas 1 foot or less. A chance of
showers.
.SAT NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. Patchy
fog. Vsby 1 to 3 NM.

Winds and seas higher in and near tstms.

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

$$

ANZ235-041300-
Rhode Island Sound-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft. A
slight chance of showers with isolated tstms after midnight.
.TUE...S winds 5 to 10 kt, becoming SE 15 to 20 kt with gusts up
to 30 kt in the afternoon. Seas 3 to 5 ft. A chance of showers.
Vsby 1 to 3 NM.
.TUE NIGHT...S winds 30 to 35 kt with gusts up to 50 kt,
diminishing to 20 to 25 kt with gusts up to 35 kt after midnight.
Seas 6 to 9 ft. A chance of showers. Vsby 1 to 3 NM.
.WED...SW winds 15 to 20 kt with gusts up to 30 kt, diminishing
to 10 to 15 kt in the afternoon. Seas 5 to 8 ft.
.WED NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after
midnight. Seas 4 to 6 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft.
.FRI...E winds 5 to 10 kt. Seas around 2 ft.
.FRI NIGHT...E winds 5 to 10 kt. Seas around 2 ft. A chance of
showers.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Patchy fog.
Vsby 1 to 3 NM.

Winds and seas higher in and near tstms.

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

$$

ANZ237-041300-
Block Island Sound-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after
midnight. Seas 2 to 4 ft. A slight chance of showers. Isolated
tstms after midnight.
.TUE...S winds 5 to 10 kt, becoming SE 15 to 20 kt with gusts up
to 30 kt in the afternoon. Seas 3 to 5 ft. Showers likely. Vsby
1 to 3 NM.
.TUE NIGHT...S winds 30 to 40 kt with gusts up to 55 kt, becoming
SW 15 to 20 kt with gusts up to 35 kt after midnight. Seas 6 to
9 ft. Showers likely. Vsby 1 to 3 NM.
.WED...SW winds 10 to 15 kt. Gusts up to 25 kt in the morning.
Seas 5 to 8 ft. A chance of showers.
.WED NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas
3 to 5 ft.
.THU AND THU NIGHT...N winds 5 to 10 kt. Seas 2 to 4 ft.
.FRI...E winds around 5 kt. Seas around 2 ft.
.FRI NIGHT...E winds around 5 kt. Seas around 2 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM.
.SAT...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
.SAT NIGHT...NE winds around 5 kt. Seas around 2 ft. Patchy fog.
Vsby 1 to 3 NM.

Winds and seas higher in and near tstms.

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

$$

ANZ230-041300-
Boston Harbor-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. A slight
chance of showers after midnight.
.TUE...SE winds around 5 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Waves 1 foot or less. A chance of
showers.
.TUE NIGHT...S winds 30 to 35 kt with gusts up to 50 kt,
diminishing to 25 to 30 kt with gusts up to 40 kt after midnight.
Waves around 2 ft. Showers likely. Vsby 1 to 3 NM.
.WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Waves around 2 ft. A chance of showers.
.WED NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.FRI THROUGH SAT NIGHT...SW winds 5 to 10 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.

$$

ANZ236-041300-
Narragansett Bay-
837 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING IN EFFECT...

.TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to around 5 kt after midnight. Waves 2 to 3 ft. A
slight chance of showers with isolated tstms after midnight.
.TUE...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 25 kt in the afternoon. Waves 2 to 4 ft. Showers likely. Vsby
1 to 3 NM.
.TUE NIGHT...S winds 30 to 35 kt with gusts up to 50 kt,
diminishing to 15 to 20 kt with gusts up to 30 kt after midnight.
Waves 4 to 7 ft. Showers likely. Vsby 1 to 3 NM.
.WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the morning.
Waves 2 to 4 ft, except 4 to 7 ft at the bay entrance. A chance
of showers.
.WED NIGHT...SW winds 5 to 10 kt, becoming W after midnight.
Waves 2 to 4 ft.
.THU AND THU NIGHT...NW winds 5 to 10 kt. Waves 2 to 3 ft.
.FRI...E winds around 5 kt. Waves around 2 ft.
.FRI NIGHT...E winds around 5 kt. Waves around 2 ft. Patchy fog.
A chance of showers. Vsby 1 to 3 NM.
.SAT...E winds 5 to 10 kt. Waves around 2 ft. Patchy fog. Vsby
1 to 3 NM.
.SAT NIGHT...W winds around 5 kt. Waves around 2 ft. Patchy fog.
Vsby 1 to 3 NM.

Winds and waves higher in and near tstms.

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

$$

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