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National Weather Service Marine Forecast FZUS51 KBOX

FZUS51 KBOX 151116
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
716 AM EDT Thu Apr 15 2021

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

ANZ200-160000-
716 AM EDT Thu Apr 15 2021

Synopsis for Massachusetts and Rhode Island coastal waters

Today low pressure will emerge off the NJ coast, and may strengthen
into a gale center Friday as it tracks south of New England. High
pressure builds in later in the weekend into early next week.

For additional information on possible hazardous weather for the
week ahead, please visit www.weather.gov/boston/erh/ghwo?sid=box.



ANZ250-160000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
716 AM EDT Thu Apr 15 2021

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

TODAY
SE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft.

TONIGHT
E winds 15 to 20 kt, increasing to 20 to 25 kt after
midnight. Gusts up to 30 kt. Seas 5 to 8 ft. Rain. Vsby 1 NM or
less.

FRI
E winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to
11 ft. Rain. Vsby 1 NM or less.

FRI NIGHT
NE winds 15 to 20 kt with gusts up to 25 kt. Seas
8 to 11 ft. A chance of rain.

SAT
N winds 15 to 20 kt with gusts up to 25 kt. Seas 7 to
9 ft. A chance of rain.

SAT NIGHT
N winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas 5 to 8 ft.

SUN THROUGH MON
SW winds 5 to 10 kt. Seas 3 to 5 ft.

MON NIGHT
SW winds around 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.



ANZ251-160000-
Massachusetts Bay and Ipswich Bay-
716 AM EDT Thu Apr 15 2021

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

TODAY
SE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft.

TONIGHT
E winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
7 ft. Rain. Vsby 1 to 3 NM.

FRI
NE winds 20 to 25 kt with gusts up to 40 kt. Seas 8 to
11 ft. Rain. Vsby 1 NM or less.

FRI NIGHT
N winds 15 to 20 kt with gusts up to 25 kt. Seas
7 to 10 ft. Rain likely. Vsby 1 to 3 NM.

SAT
N 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 rain.

SAT NIGHT
N winds 5 to 10 kt. Gusts up to 20 kt in the
evening. Seas 4 to 7 ft.

SUN
NE winds 5 to 10 kt. Seas 3 to 5 ft.

SUN NIGHT
SW winds 5 to 10 kt. Seas 2 to 4 ft.

MON
SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of rain.

MON 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.



ANZ231-160000-
Cape Cod Bay-
716 AM EDT Thu Apr 15 2021

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

TODAY
SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft.

TONIGHT
E winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Rain. Vsby 1 to 3 NM.

FRI
E winds 20 to 25 kt. Gusts up to 35 kt in the morning.
Seas 5 to 7 ft. Rain. Vsby 1 NM or less.

FRI NIGHT
N winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 7 ft. Rain likely.

SAT
N winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
6 ft. A chance of rain.

SAT NIGHT
N winds 10 to 15 kt with gusts up to 20 kt, becoming
NW 5 to 10 kt after midnight. Seas 3 to 5 ft.

SUN THROUGH MON 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.



ANZ254-160000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
716 AM EDT Thu Apr 15 2021

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

TODAY
E winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to
6 ft.

TONIGHT
E winds 15 to 20 kt, increasing to 20 to 25 kt after
midnight. Gusts up to 35 kt. Seas 6 to 9 ft. Rain. Vsby 1 NM or
less.

FRI
E winds 25 to 30 kt, becoming SE 20 to 25 kt in the
afternoon. Seas 8 to 10 ft. A chance of rain. Vsby 1 NM or less.

FRI NIGHT
SE winds 15 to 20 kt, becoming NW after midnight.
Gusts up to 25 kt. Seas 7 to 10 ft. A chance of rain.

SAT
N winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to
9 ft. A chance of rain.

SAT NIGHT
N winds 10 to 15 kt. Gusts up to 25 kt in the
evening. Seas 5 to 8 ft.

SUN
NW winds 5 to 10 kt. Seas 4 to 6 ft.

SUN NIGHT THROUGH MON NIGHT
SW 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.



ANZ255-160000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
716 AM EDT Thu Apr 15 2021

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

TODAY
SE winds 10 to 15 kt, becoming E 15 to 20 kt this
afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. A slight chance of
rain this afternoon.

TONIGHT
E winds 15 to 20 kt, increasing to 20 to 25 kt after
midnight. Gusts up to 35 kt. Seas 5 to 8 ft. Rain. Vsby 1 NM or
less.

FRI
NE winds 20 to 25 kt, becoming W in the afternoon. Gusts
up to 35 kt. Seas 6 to 9 ft. A chance of rain. Vsby 1 NM or less.

FRI NIGHT
W winds 20 to 25 kt, becoming NW 15 to 20 kt after
midnight. Seas 6 to 9 ft. A chance of rain.

SAT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
7 ft. A chance of rain.

SAT NIGHT
N winds 10 to 15 kt with gusts up to 25 kt, becoming
NW 5 to 10 kt after midnight. Seas 4 to 6 ft.

SUN THROUGH MON NIGHT
SW 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.



ANZ256-160000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH FRIDAY EVENING...

TODAY
SE winds 10 to 15 kt, becoming E 15 to 20 kt this
afternoon. Gusts up to 30 kt. Seas 3 to 5 ft. A slight chance of
rain this morning, then a chance of rain this afternoon. Vsby
1 NM or less.

TONIGHT
E winds 15 to 20 kt, becoming NE 20 to 25 kt after
midnight. Gusts up to 30 kt. Seas 5 to 7 ft. Rain. Vsby 1 NM or
less.

FRI
N winds 20 to 25 kt, becoming W in the afternoon. Gusts up
to 30 kt. Seas 6 to 7 ft. A chance of rain. Vsby 1 NM or less.

FRI NIGHT
NW winds 20 to 25 kt, diminishing to 15 to 20 kt
after midnight. Gusts up to 30 kt. Seas 5 to 7 ft. A chance of
rain.

SAT
NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Gusts up to 25 kt. Seas 4 to 6 ft.

SAT NIGHT
NW winds 5 to 10 kt. Seas 2 to 4 ft.

SUN THROUGH MON 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.



ANZ232-160000-
Nantucket Sound-
716 AM EDT Thu Apr 15 2021

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

TODAY
SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. A slight chance of rain this afternoon.

TONIGHT
E winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Rain. Vsby 1 NM or less.

FRI
NE winds 20 to 25 kt, becoming W in the afternoon. Gusts
up to 30 kt. Seas 4 to 6 ft. A chance of rain. Vsby 1 NM or less.

FRI NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of rain.

SAT
N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. A chance of rain.

SAT NIGHT
N winds 10 to 15 kt with gusts up to 20 kt, becoming
NW 5 to 10 kt after midnight. Seas 2 to 4 ft.

SUN THROUGH MON NIGHT
SW winds 5 to 10 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.



ANZ233-160000-
Vineyard Sound-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH FRIDAY EVENING...

TODAY
SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. A chance of rain this afternoon.

TONIGHT
E winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Rain. Vsby 1 to 3 NM.

FRI
N winds 15 to 20 kt, becoming W in the afternoon. Gusts up
to 30 kt. Seas 3 to 5 ft. Rain. Vsby 1 NM or less.

FRI NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of rain.

SAT
NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. A chance of rain.

SAT NIGHT
N winds 5 to 10 kt. Seas around 2 ft.

SUN THROUGH MON NIGHT
SW winds 5 to 10 kt. Seas 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.



ANZ234-160000-
Buzzards Bay-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH FRIDAY EVENING...

TODAY
SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. A chance of rain this afternoon.

TONIGHT
E winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Rain. Vsby 1 to 3 NM.

FRI
N winds 15 to 20 kt, becoming W in the afternoon. Gusts up
to 30 kt. Seas 3 to 4 ft. Rain. Vsby 1 NM or less.

FRI NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. A chance of rain.

SAT
N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. A chance of rain.

SAT NIGHT
N winds 5 to 10 kt. Seas 2 to 3 ft.

SUN THROUGH MON NIGHT
SW winds 5 to 10 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.



ANZ235-160000-
Rhode Island Sound-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH FRIDAY EVENING...

TODAY
SE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. A chance of rain this afternoon with vsby 1 to 3 NM.

TONIGHT
E winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to
6 ft. Rain. Vsby 1 to 3 NM.

FRI
N winds 15 to 20 kt, becoming W 20 to 25 kt in the
afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. A chance of rain.
Vsby 1 NM or less.

FRI NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of rain.

SAT
NW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft.

SAT NIGHT
N winds 5 to 10 kt. Seas 2 to 3 ft.

SUN THROUGH MON NIGHT
SW winds 5 to 10 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.



ANZ237-160000-
Block Island Sound-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH FRIDAY EVENING...

TODAY
SE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft. A slight chance of rain this morning, then rain likely this
afternoon. Vsby 1 NM or less.

TONIGHT
NE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to
6 ft. Rain. Vsby 1 to 3 NM.

FRI
NW winds 15 to 20 kt, becoming W in the afternoon. Gusts
up to 30 kt. Seas 5 to 6 ft. Rain likely. Vsby 1 NM or less.

FRI NIGHT
NW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of rain.

SAT AND SAT NIGHT
N winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 4 ft.

SUN THROUGH MON NIGHT
SW winds 5 to 10 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.



ANZ230-160000-
Boston Harbor-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY EVENING...

TODAY
E winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A slight chance of rain this afternoon.

TONIGHT
E winds 10 to 15 kt with gusts up to 30 kt. Waves 2 to
3 ft, except 4 to 6 ft at the outer harbor entrance. Rain.

FRI
NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Gusts up to 30 kt. Waves 2 to 3 ft, except 5 to 8 ft
at the outer harbor entrance. Rain. Vsby 1 NM or less.

FRI NIGHT
N winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Waves 2 to 3 ft, except 4 to
7 ft at the outer harbor entrance. Rain likely. Vsby 1 to 3 NM.

SAT
N winds 10 to 15 kt with gusts up to 25 kt. Waves around
2 ft, except 4 to 7 ft at the outer harbor entrance. A chance of
rain.

SAT NIGHT
N winds 5 to 10 kt, becoming NW after midnight.
Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance.

SUN
NE winds around 5 kt. Waves 1 foot or less, except 2 to
4 ft at the outer harbor entrance. A chance of rain.

SUN NIGHT
SW winds around 5 kt. Waves 1 foot or less.

MON
SW winds around 5 kt. Waves 1 foot or less. A chance of
rain.

MON NIGHT
SW 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.



ANZ236-160000-
Narragansett Bay-
716 AM EDT Thu Apr 15 2021

...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH
FRIDAY EVENING...

TODAY
SE winds 5 to 10 kt, becoming E 10 to 15 kt this
afternoon. Gusts up to 25 kt. Waves around 2 ft. A chance of rain
this afternoon with vsby 1 to 3 NM.

TONIGHT
NE winds 10 to 15 kt with gusts up to 30 kt. Waves
2 to 3 ft. Rain. Vsby 1 to 3 NM.

FRI
N winds 10 to 15 kt, becoming NW in the afternoon. Gusts
up to 25 kt. Waves 2 to 3 ft. Rain likely. Vsby 1 NM or less.

FRI NIGHT
NW winds 10 to 15 kt with gusts up to 25 kt. Waves
around 2 ft, except 3 to 5 ft at the bay entrance. A chance of
rain.

SAT AND SAT NIGHT
NW winds 10 to 15 kt with gusts up to 25 kt.
Waves around 2 ft.

SUN THROUGH MON 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.



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