148
FZUS51 KBOX 200504
CWFBOX
COASTAL WATERS FORECAST FOR MASSACHUSETTS AND RHODE ISLAND
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
104 AM EDT MON JUL 20 2026
COASTAL WATERS FROM THE MERRIMACK RIVER MA TO WATCH HILL RI OUT
TO 60 NM
ANZ200-201800-
104 AM EDT MON JUL 20 2026
SYNOPSIS FOR MASSACHUSETTS AND RHODE ISLAND COASTAL WATERS
HIGH PRES AND VERY TRANQUIL BOATING WEATHER DEVELOPS FOR TONIGHT AND
MON. UNSETTLED WEATHER IN THE FORM OF SHOWERS AND THUNDERSTORMS
RETURNS TO THE MA/RI WATERS LATE TUE AND INTO WED. A COLD FRONT
SHOULD CROSS THE WATERS BY THU AFTERNOON. A HIGH PRES SHOULD ARRIVE
FOR FRI.
ANZ250-201800-
COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK
NATIONAL MARINE SANCTUARY-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 6 SECONDS AND NW 1 FOOT AT 3 SECONDS.
MON
W WINDS 5 TO 10 KT, BECOMING S IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: W 1 FOOT AT 3 SECONDS AND SE 1 FOOT AT
8 SECONDS.
MON NIGHT
S WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS AROUND 2 FT. WAVE DETAIL: W 2 FT AT 3 SECONDS AND S
2 FT AT 8 SECONDS.
TUE
S WINDS 10 TO 15 KT WITH GUSTS UP TO 25 KT. SEAS 2 TO
3 FT. WAVE DETAIL: S 3 FT AT 4 SECONDS AND E 1 FOOT AT
12 SECONDS.
TUE NIGHT
S WINDS AROUND 15 KT WITH GUSTS UP TO 25 KT. SEAS
3 TO 4 FT. WAVE DETAIL: S 4 FT AT 5 SECONDS AND SE 1 FOOT AT
11 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED
S WINDS 15 TO 20 KT WITH GUSTS UP TO 30 KT. SEAS 4 TO
6 FT. WAVE DETAIL: S 5 FT AT 8 SECONDS AND SW 3 FT AT 4 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 15 TO 20 KT, BECOMING W 10 TO 15 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 4 TO 6 FT. A CHANCE OF SHOWERS.
A CHANCE OF TSTMS IN THE EVENING.
THU
W WINDS 5 TO 10 KT. SEAS 3 TO 5 FT.
THU NIGHT THROUGH FRI NIGHT
SW WINDS 5 TO 10 KT. SEAS 2 TO
4 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.
ANZ251-201800-
MASSACHUSETTS BAY AND IPSWICH BAY-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: NW 1 FOOT AT 3 SECONDS AND NE 1 FOOT AT 5 SECONDS.
MON
W WINDS 5 TO 10 KT, BECOMING SE IN THE AFTERNOON. SEAS
1 FOOT OR LESS, THEN AROUND 2 FT IN THE AFTERNOON. WAVE DETAIL:
NW 1 FOOT AT 3 SECONDS AND NE 1 FOOT AT 5 SECONDS, BECOMING W
1 FOOT AT 3 SECONDS AND E 1 FOOT AT 5 SECONDS.
MON NIGHT
S WINDS 10 TO 15 KT, DIMINISHING TO 5 TO 10 KT AFTER
MIDNIGHT. SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 3 SECONDS AND
W 1 FOOT AT 3 SECONDS.
TUE
S WINDS 10 TO 15 KT WITH GUSTS UP TO 25 KT. SEAS 2 TO
3 FT. WAVE DETAIL: S 3 FT AT 4 SECONDS AND E 1 FOOT AT
12 SECONDS.
TUE NIGHT AND WED
SW WINDS 15 TO 20 KT WITH GUSTS UP TO 25 KT.
SEAS 2 TO 3 FT. WAVE DETAIL: S 3 FT AT 4 SECONDS AND E 1 FOOT AT
11 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
W WINDS 10 TO 15 KT. GUSTS UP TO 25 KT IN THE
EVENING. SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 6 SECONDS AND SW
2 FT AT 3 SECONDS. A CHANCE OF SHOWERS. A CHANCE OF TSTMS IN THE
EVENING.
THU THROUGH FRI NIGHT
S 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.
ANZ231-201800-
CAPE COD BAY-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS AROUND 5 KT. SEAS 1 FOOT OR LESS.
WAVE DETAIL: N 1 FOOT AT 5 SECONDS AND E 1 FOOT AT 12 SECONDS.
MON
NW WINDS AROUND 5 KT, BECOMING SE IN THE AFTERNOON. SEAS
1 FOOT OR LESS. WAVE DETAIL: N 1 FOOT AT 5 SECONDS AND E 1 FOOT
AT 12 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT IN THE EVENING,
THEN 1 FOOT OR LESS. WAVE DETAIL: SW 1 FOOT AT 3 SECONDS AND NE
1 FOOT AT 5 SECONDS, BECOMING SW 1 FOOT AT 2 SECONDS AND E 1 FOOT
AT 4 SECONDS.
TUE
S WINDS 5 TO 10 KT, BECOMING SE 10 TO 15 KT IN THE
AFTERNOON. GUSTS UP TO 20 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S 2 FT
AT 4 SECONDS AND E 1 FOOT AT 12 SECONDS.
TUE NIGHT AND WED
SW WINDS 15 TO 20 KT WITH GUSTS UP TO 30 KT.
SEAS 2 TO 4 FT. WAVE DETAIL: S 4 FT AT 4 SECONDS AND E 2 FT AT
10 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 15 TO 20 KT WITH GUSTS UP TO 30 KT,
BECOMING W 10 TO 15 KT WITH GUSTS UP TO 20 KT AFTER MIDNIGHT.
SEAS 2 TO 4 FT. WAVE DETAIL: SW 4 FT AT 5 SECONDS AND SE 2 FT AT
10 SECONDS. A CHANCE OF SHOWERS. A CHANCE OF TSTMS IN THE
EVENING.
THU
N WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF SHOWERS.
THU NIGHT THROUGH FRI NIGHT
SW WINDS AROUND 5 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.
ANZ254-201800-
COASTAL WATERS FROM PROVINCETOWN MA TO CHATHAM MA TO NANTUCKET MA
OUT 20 NM-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: S 3 FT AT 8 SECONDS AND NW 1 FOOT AT 4 SECONDS.
MON
NW WINDS 5 TO 10 KT, BECOMING SW IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: S 3 FT AT 8 SECONDS AND NW 1 FOOT AT
4 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S
3 FT AT 8 SECONDS AND NW 1 FOOT AT 4 SECONDS.
TUE
SE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 5 SECONDS AND W 1 FOOT AT
3 SECONDS.
TUE NIGHT
S WINDS 15 TO 20 KT, INCREASING TO 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 3 TO 4 FT, BUILDING TO 4 TO
6 FT AFTER MIDNIGHT. WAVE DETAIL: S 4 FT AT 5 SECONDS AND E
1 FOOT AT 11 SECONDS, BECOMING SW 6 FT AT 6 SECONDS. SHOWERS WITH
A CHANCE OF TSTMS.
WED
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT. SEAS 6 TO
9 FT. WAVE DETAIL: S 9 FT AT 9 SECONDS AND E 5 FT AT 10 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT. SEAS
7 TO 10 FT. A CHANCE OF SHOWERS. A CHANCE OF TSTMS IN THE
EVENING.
THU
NW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 5 TO
7 FT. A CHANCE OF SHOWERS.
THU NIGHT
S WINDS 5 TO 10 KT. SEAS 3 TO 5 FT. A CHANCE OF
SHOWERS.
FRI AND FRI NIGHT
NE WINDS AROUND 5 KT, BECOMING SW. SEAS 2 TO
4 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.
ANZ255-201800-
COASTAL WATERS EXTENDING OUT TO 25 NM SOUTH OF MARTHAS VINEYARD
AND NANTUCKET-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. WAVE
DETAIL: S 4 FT AT 8 SECONDS AND N 2 FT AT 6 SECONDS.
MON
N WINDS AROUND 5 KT, BECOMING SW IN THE AFTERNOON. SEAS
3 TO 4 FT. WAVE DETAIL: S 4 FT AT 8 SECONDS AND W 2 FT AT
7 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S
3 FT AT 8 SECONDS AND W 1 FOOT AT 8 SECONDS.
TUE
SE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
SEAS 2 TO 3 FT. WAVE DETAIL: SW 3 FT AT 6 SECONDS AND SE 1 FOOT
AT 12 SECONDS.
TUE NIGHT
S WINDS 15 TO 20 KT, INCREASING TO 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 3 TO 5 FT, BUILDING TO 5 TO
7 FT AFTER MIDNIGHT. WAVE DETAIL: SW 5 FT AT 7 SECONDS AND E
1 FOOT AT 11 SECONDS, BECOMING S 7 FT AT 8 SECONDS AND SW 3 FT AT
7 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED AND WED NIGHT
W WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT.
SEAS 7 TO 10 FT. WAVE DETAIL: S 10 FT AT 9 SECONDS AND SW 4 FT AT
4 SECONDS. SHOWERS. A CHANCE OF TSTMS.
THU
NW WINDS 10 TO 15 KT. SEAS 5 TO 8 FT. A CHANCE OF SHOWERS.
THU NIGHT
E WINDS 5 TO 10 KT. SEAS 4 TO 6 FT. A CHANCE OF
SHOWERS.
FRI
NE WINDS AROUND 5 KT. SEAS 3 TO 5 FT.
FRI NIGHT
S WINDS AROUND 5 KT. SEAS 2 TO 4 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.
ANZ256-201800-
COASTAL WATERS FROM MONTAUK NY TO MARTHAS VINEYARD EXTENDING OUT
TO 20 NM SOUTH OF BLOCK ISLAND-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. WAVE
DETAIL: S 4 FT AT 8 SECONDS AND NW 2 FT AT 4 SECONDS.
MON
N WINDS AROUND 5 KT, BECOMING S IN THE AFTERNOON. SEAS
3 TO 4 FT. WAVE DETAIL: S 4 FT AT 8 SECONDS AND NW 1 FOOT AT
7 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S
3 FT AT 8 SECONDS AND SW 1 FOOT AT 7 SECONDS.
TUE
SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: S 3 FT AT 7 SECONDS AND SW 1 FOOT AT
3 SECONDS. A CHANCE OF SHOWERS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT, BECOMING SW 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 3 TO 5 FT, BUILDING TO 5 TO
7 FT AFTER MIDNIGHT. WAVE DETAIL: SW 5 FT AT 6 SECONDS, BECOMING
S 7 FT AT 8 SECONDS AND S 3 FT AT 5 SECONDS. SHOWERS WITH A
CHANCE OF TSTMS.
WED
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT. SEAS 7 TO
10 FT. WAVE DETAIL: S 9 FT AT 9 SECONDS AND S 4 FT AT 4 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 20 TO 25 KT, BECOMING W 15 TO 20 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 8 TO 10 FT, SUBSIDING TO 6 TO
9 FT AFTER MIDNIGHT. A CHANCE OF SHOWERS. A CHANCE OF TSTMS IN
THE EVENING.
THU
NW WINDS 10 TO 15 KT. SEAS 5 TO 7 FT. A CHANCE OF SHOWERS.
THU NIGHT THROUGH FRI NIGHT
SW WINDS 5 TO 10 KT. SEAS 3 TO
5 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.
ANZ232-201800-
NANTUCKET SOUND-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: NW 1 FOOT AT 3 SECONDS AND S 1 FOOT AT 8 SECONDS.
MON
NW WINDS 5 TO 10 KT, BECOMING SW IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: NW 1 FOOT AT 3 SECONDS AND SE 1 FOOT AT
8 SECONDS.
MON NIGHT
S WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SW 1 FOOT AT 3 SECONDS AND S 1 FOOT AT 8 SECONDS.
TUE
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: S 2 FT AT 4 SECONDS AND E 1 FOOT AT
12 SECONDS.
TUE NIGHT
S WINDS 15 TO 20 KT, INCREASING TO 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 3 TO 5 FT. WAVE DETAIL: SW 4 FT
AT 5 SECONDS AND E 1 FOOT AT 11 SECONDS. SHOWERS WITH A CHANCE OF
TSTMS.
WED
SW WINDS 20 TO 25 KT, INCREASING TO 25 TO 30 KT IN THE
AFTERNOON. SEAS 4 TO 6 FT. WAVE DETAIL: SW 4 FT AT 4 SECONDS AND
S 4 FT AT 7 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 25 TO 30 KT, BECOMING W 20 TO 25 KT AFTER
MIDNIGHT. SEAS 4 TO 6 FT. A CHANCE OF SHOWERS. A CHANCE OF TSTMS
IN THE EVENING.
THU
N WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. A CHANCE OF SHOWERS.
THU NIGHT THROUGH FRI NIGHT
SW WINDS 5 TO 10 KT. SEAS 2 TO
3 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.
ANZ233-201800-
VINEYARD SOUND-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: SW 2 FT AT 7 SECONDS AND NW 1 FOOT AT 4 SECONDS.
MON
NW WINDS AROUND 5 KT, BECOMING SW IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: SW 2 FT AT 8 SECONDS AND W 1 FOOT AT
5 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SW 2 FT AT 8 SECONDS AND SW 1 FOOT AT 3 SECONDS.
TUE
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: SW 2 FT AT 6 SECONDS AND E 1 FOOT AT
12 SECONDS. A CHANCE OF SHOWERS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT, INCREASING TO 20 TO 25 KT AFTER
MIDNIGHT. SEAS 3 TO 5 FT. WAVE DETAIL: SW 5 FT AT 8 SECONDS AND
SW 3 FT AT 5 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT. SEAS 5 TO
7 FT. WAVE DETAIL: SW 7 FT AT 9 SECONDS AND SW 3 FT AT 6 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT,
BECOMING W 15 TO 20 KT AFTER MIDNIGHT. SEAS 5 TO 7 FT. A CHANCE
OF SHOWERS. A CHANCE OF TSTMS IN THE EVENING.
THU
W WINDS AROUND 10 KT. SEAS 3 TO 5 FT. A CHANCE OF SHOWERS.
THU NIGHT AND FRI
SW WINDS 5 TO 10 KT, BECOMING E. SEAS 2 TO
4 FT.
FRI NIGHT
SW 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.
ANZ234-201800-
BUZZARDS BAY-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SW 2 FT AT 7 SECONDS AND W 1 FOOT AT 4 SECONDS.
MON
NW WINDS AROUND 5 KT, BECOMING SW 10 TO 15 KT WITH GUSTS
UP TO 20 KT IN THE AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: SW
2 FT AT 7 SECONDS AND SW 1 FOOT AT 4 SECONDS.
MON NIGHT
SW WINDS 10 TO 15 KT, BECOMING S 5 TO 10 KT AFTER
MIDNIGHT. SEAS AROUND 2 FT. WAVE DETAIL: SW 1 FOOT AT 3 SECONDS
AND SW 1 FOOT AT 7 SECONDS.
TUE
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: S 2 FT AT 7 SECONDS AND SW 1 FOOT AT
3 SECONDS. A CHANCE OF SHOWERS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT WITH GUSTS UP TO 25 KT. SEAS
3 TO 4 FT. WAVE DETAIL: S 4 FT AT 6 SECONDS AND SE 1 FOOT AT
11 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 35 KT. SEAS 4 TO
6 FT. WAVE DETAIL: SW 5 FT AT 8 SECONDS AND SW 4 FT AT 4 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT,
BECOMING W 15 TO 20 KT AFTER MIDNIGHT. SEAS 3 TO 5 FT. A CHANCE
OF SHOWERS. A CHANCE OF TSTMS IN THE EVENING.
THU
W WINDS AROUND 10 KT. SEAS 2 TO 4 FT. A CHANCE OF SHOWERS.
THU NIGHT THROUGH FRI NIGHT
SW WINDS 5 TO 10 KT. SEAS 2 TO
3 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.
ANZ235-201800-
RHODE ISLAND SOUND-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: S 3 FT AT 8 SECONDS AND NW 1 FOOT AT 7 SECONDS.
MON
NW WINDS AROUND 5 KT, BECOMING SW IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: S 3 FT AT 8 SECONDS AND SW 1 FOOT AT
8 SECONDS.
MON NIGHT
S WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S
3 FT AT 8 SECONDS AND SW 1 FOOT AT 5 SECONDS.
TUE
SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: SW 3 FT AT 6 SECONDS AND SE 1 FOOT AT
12 SECONDS. A CHANCE OF SHOWERS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT, BECOMING SW 20 TO 25 KT AFTER
MIDNIGHT. SEAS 3 TO 4 FT, BUILDING TO 4 TO 6 FT AFTER MIDNIGHT.
WAVE DETAIL: S 4 FT AT 7 SECONDS, BECOMING SW 6 FT AT 7 SECONDS
AND E 1 FOOT AT 11 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT. SEAS 5 TO
8 FT. WAVE DETAIL: S 8 FT AT 9 SECONDS AND NE 3 FT AT 10 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT,
BECOMING W 15 TO 20 KT AFTER MIDNIGHT. SEAS 5 TO 8 FT. A CHANCE
OF SHOWERS. A CHANCE OF TSTMS IN THE EVENING.
THU
W WINDS AROUND 10 KT. SEAS 4 TO 6 FT. A CHANCE OF SHOWERS.
THU NIGHT
SW WINDS 5 TO 10 KT. SEAS 3 TO 5 FT.
FRI AND FRI NIGHT
E WINDS 5 TO 10 KT, BECOMING SW. SEAS 2 TO
4 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.
ANZ237-201800-
BLOCK ISLAND SOUND-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: S 3 FT AT 8 SECONDS AND NW 1 FOOT AT 3 SECONDS.
MON
N WINDS AROUND 5 KT, BECOMING S IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: SW 3 FT AT 7 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: S
2 FT AT 8 SECONDS AND SW 1 FOOT AT 3 SECONDS.
TUE
S WINDS 5 TO 10 KT, BECOMING SE 10 TO 15 KT WITH GUSTS UP
TO 20 KT IN THE AFTERNOON. SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT
AT 6 SECONDS AND SW 1 FOOT AT 3 SECONDS. A CHANCE OF SHOWERS AND
TSTMS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT WITH GUSTS UP TO 25 KT. SEAS
2 TO 4 FT, BUILDING TO 4 TO 6 FT AFTER MIDNIGHT. WAVE DETAIL: S
4 FT AT 6 SECONDS, BECOMING SW 6 FT AT 6 SECONDS AND E 1 FOOT AT
10 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED
SW WINDS 15 TO 20 KT WITH GUSTS UP TO 30 KT. SEAS 5 TO
8 FT. WAVE DETAIL: S 7 FT AT 9 SECONDS AND SW 2 FT AT 5 SECONDS.
SHOWERS WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 15 TO 20 KT, BECOMING NW 10 TO 15 KT AFTER
MIDNIGHT. GUSTS UP TO 25 KT. SEAS 5 TO 7 FT. A CHANCE OF SHOWERS.
A CHANCE OF TSTMS IN THE EVENING.
THU
W WINDS 5 TO 10 KT. SEAS 4 TO 6 FT.
THU NIGHT THROUGH FRI NIGHT
SW WINDS 5 TO 10 KT. SEAS 2 TO
4 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.
ANZ230-201800-
BOSTON HARBOR-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
W WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS.
MON
W WINDS AROUND 5 KT, BECOMING SE IN THE AFTERNOON. WAVES
1 FOOT OR LESS.
MON NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS.
TUE
S WINDS 5 TO 10 KT, BECOMING SE 10 TO 15 KT WITH GUSTS UP
TO 20 KT IN THE AFTERNOON. WAVES 2 TO 3 FT.
TUE NIGHT AND WED
SW WINDS 10 TO 15 KT WITH GUSTS UP TO 25 KT.
WAVES 2 TO 3 FT. SHOWERS. A CHANCE OF TSTMS IN THE EVENING, THEN
A CHANCE OF TSTMS THROUGH THE DAY.
WED NIGHT
W WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. WAVES AROUND 2 FT IN THE EVENING, THEN 1 FOOT OR LESS.
SHOWERS LIKELY WITH A CHANCE OF TSTMS IN THE EVENING, THEN A
CHANCE OF SHOWERS AFTER MIDNIGHT.
THU THROUGH FRI NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FOOT OR
LESS.
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.
ANZ236-201800-
NARRAGANSETT BAY-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS AROUND 5 KT. WAVES AROUND 2 FT.
MON
NW WINDS AROUND 5 KT, BECOMING S IN THE AFTERNOON. WAVES
AROUND 2 FT.
MON NIGHT
S WINDS 5 TO 10 KT. WAVES AROUND 2 FT.
TUE
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. WAVES 2 TO
3 FT. A CHANCE OF SHOWERS AND TSTMS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT. WAVES 2 TO 4 FT. SHOWERS. A
CHANCE OF TSTMS IN THE EVENING.
WED
SW WINDS 15 TO 20 KT WITH GUSTS UP TO 30 KT. WAVES 3 TO
5 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
WED NIGHT
SW WINDS 15 TO 20 KT WITH GUSTS UP TO 25 KT,
BECOMING W 5 TO 10 KT AFTER MIDNIGHT. WAVES 2 TO 4 FT. A CHANCE
OF SHOWERS. A CHANCE OF TSTMS IN THE EVENING.
THU THROUGH FRI NIGHT
SW WINDS 5 TO 10 KT. WAVES 2 TO 3 FT.
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.
ANZ280-201800-
OCEAN WATERS FROM THE MERRIMACK RIVER TO PLYMOUTH FROM 40 TO
60 NM-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS AROUND 10 KT WITH GUSTS UP TO 20 KT.
SEAS 3 TO 4 FT. WAVE DETAIL: NW 2 FT AT 4 SECONDS AND S 2 FT AT
8 SECONDS.
MON
W WINDS 5 TO 10 KT, BECOMING SW IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: S 3 FT AT 8 SECONDS AND NW 2 FT AT
4 SECONDS.
MON NIGHT
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
2 TO 3 FT. WAVE DETAIL: S 3 FT AT 8 SECONDS AND SW 2 FT AT
3 SECONDS.
TUE
S WINDS AROUND 10 KT, BECOMING SE IN THE AFTERNOON. GUSTS
UP TO 25 KT. SEAS 2 TO 4 FT. WAVE DETAIL: S 3 FT AT 7 SECONDS AND
W 1 FOOT AT 3 SECONDS.
TUE NIGHT
S WINDS 15 TO 20 KT WITH GUSTS UP TO 30 KT. SEAS
4 TO 6 FT. WAVE DETAIL: SE 6 FT AT 6 SECONDS AND SW 1 FOOT AT
3 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED
S WINDS 20 TO 25 KT WITH GUSTS UP TO 30 KT. SEAS 6 TO
9 FT. WAVE DETAIL: S 8 FT AT 8 SECONDS AND E 4 FT AT 11 SECONDS.
A CHANCE OF TSTMS. SHOWERS IN THE MORNING, THEN A CHANCE OF
SHOWERS IN THE AFTERNOON.
WED NIGHT
SW WINDS 20 TO 25 KT, BECOMING W 15 TO 20 KT AFTER
MIDNIGHT. GUSTS UP TO 35 KT. SEAS 6 TO 9 FT. A CHANCE OF SHOWERS.
A CHANCE OF TSTMS IN THE EVENING.
THU
W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 5 TO
8 FT. A CHANCE OF SHOWERS.
THU NIGHT
SW WINDS 5 TO 10 KT. SEAS 4 TO 6 FT.
FRI AND FRI NIGHT
N WINDS AROUND 5 KT, BECOMING SW AROUND
5 KT. SEAS 3 TO 5 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.
ANZ281-201800-
OCEAN WATERS FROM PROVINCETOWN TO NANTUCKET FROM 20 TO 60 NM-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS 5 TO 10 KT. SEAS 3 TO 5 FT. WAVE
DETAIL: S 4 FT AT 8 SECONDS AND NW 2 FT AT 5 SECONDS.
MON
NW WINDS 5 TO 10 KT, BECOMING SW IN THE AFTERNOON. SEAS
3 TO 5 FT. WAVE DETAIL: S 4 FT AT 8 SECONDS AND NW 1 FOOT AT
5 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL: S
3 FT AT 8 SECONDS AND NW 1 FOOT AT 4 SECONDS.
TUE
SE 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 6 SECONDS AND NW 1 FOOT AT 3 SECONDS.
TUE NIGHT
S WINDS 15 TO 20 KT, INCREASING TO 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 3 TO 5 FT, BUILDING TO 5 TO
8 FT AFTER MIDNIGHT. WAVE DETAIL: SE 5 FT AT 6 SECONDS AND SW
1 FOOT AT 2 SECONDS, BECOMING S 8 FT AT 8 SECONDS AND SW 2 FT AT
5 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED AND WED NIGHT
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 35 KT.
SEAS 9 TO 12 FT. WAVE DETAIL: S 10 FT AT 9 SECONDS AND SE 5 FT AT
10 SECONDS. SHOWERS. A CHANCE OF TSTMS.
THU
W WINDS 15 TO 20 KT WITH GUSTS UP TO 25 KT. SEAS 7 TO
10 FT. A CHANCE OF SHOWERS.
THU NIGHT
SE WINDS 5 TO 10 KT. SEAS 5 TO 7 FT. A CHANCE OF
SHOWERS.
FRI
N WINDS AROUND 5 KT. SEAS 4 TO 5 FT. A CHANCE OF SHOWERS.
FRI NIGHT
W WINDS AROUND 5 KT. SEAS 3 TO 5 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.
ANZ282-201800-
OCEAN WATERS FROM MARTHAS VINEYARD TO NANTUCKET FROM 25 TO 60 NM-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
NW WINDS 5 TO 10 KT. SEAS 4 TO 5 FT. WAVE
DETAIL: SW 5 FT AT 8 SECONDS AND N 1 FOOT AT 5 SECONDS.
MON
N WINDS AROUND 5 KT, BECOMING E AROUND 5 KT IN THE
AFTERNOON. SEAS 3 TO 5 FT. WAVE DETAIL: SW 4 FT AT 8 SECONDS AND
N 1 FOOT AT 4 SECONDS.
MON NIGHT
SE WINDS AROUND 5 KT, BECOMING S AFTER MIDNIGHT.
SEAS 3 TO 4 FT. WAVE DETAIL: S 3 FT AT 8 SECONDS AND N 1 FOOT AT
5 SECONDS.
TUE
SE 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 4 SECONDS. A CHANCE OF SHOWERS IN
THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT, INCREASING TO 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 4 TO 6 FT, BUILDING TO 7 TO
10 FT AFTER MIDNIGHT. WAVE DETAIL: SW 6 FT AT 6 SECONDS AND E
1 FOOT AT 10 SECONDS, BECOMING S 10 FT AT 9 SECONDS AND SW 2 FT
AT 3 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED AND WED NIGHT
SW WINDS 20 TO 25 KT WITH GUSTS UP TO 35 KT.
SEAS 9 TO 12 FT. WAVE DETAIL: SW 10 FT AT 9 SECONDS AND NE 3 FT
AT 10 SECONDS. SHOWERS. A CHANCE OF TSTMS.
THU
W WINDS 15 TO 20 KT WITH GUSTS UP TO 25 KT. SEAS 7 TO
10 FT. A CHANCE OF SHOWERS.
THU NIGHT
E WINDS 5 TO 10 KT. SEAS 5 TO 7 FT. A CHANCE OF
SHOWERS.
FRI
NE WINDS AROUND 5 KT. SEAS 4 TO 5 FT. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS AROUND 5 KT. SEAS AROUND 4 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.
ANZ283-201800-
OCEAN WATERS FROM MONTAUK NY TO MARTHAS VINEYARD FROM 25 TO 60 NM-
104 AM EDT MON JUL 20 2026
REST OF TONIGHT
N WINDS 5 TO 10 KT. SEAS 4 TO 5 FT. WAVE
DETAIL: SW 4 FT AT 8 SECONDS AND NW 1 FOOT AT 3 SECONDS.
MON
NE WINDS 5 TO 10 KT, BECOMING SE IN THE AFTERNOON. SEAS
3 TO 4 FT. WAVE DETAIL: S 4 FT AT 8 SECONDS AND N 1 FOOT AT
4 SECONDS.
MON NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 3 FT. WAVE DETAIL: S
3 FT AT 8 SECONDS AND W 1 FOOT AT 3 SECONDS.
TUE
SE WINDS 10 TO 15 KT WITH GUSTS UP TO 25 KT. SEAS 3 TO
4 FT. WAVE DETAIL: S 4 FT AT 6 SECONDS AND SE 1 FOOT AT
11 SECONDS. A CHANCE OF SHOWERS IN THE AFTERNOON.
TUE NIGHT
S WINDS 15 TO 20 KT, BECOMING SW 20 TO 25 KT AFTER
MIDNIGHT. GUSTS UP TO 30 KT. SEAS 4 TO 5 FT, BUILDING TO 6 TO
9 FT AFTER MIDNIGHT. WAVE DETAIL: S 5 FT AT 7 SECONDS AND NW
1 FOOT AT 6 SECONDS, BECOMING S 9 FT AT 9 SECONDS AND S 3 FT AT
6 SECONDS. SHOWERS WITH A CHANCE OF TSTMS.
WED AND WED NIGHT
W WINDS 20 TO 25 KT WITH GUSTS UP TO 35 KT.
SEAS 8 TO 10 FT. WAVE DETAIL: S 10 FT AT 9 SECONDS AND S 4 FT AT
3 SECONDS. SHOWERS. A CHANCE OF TSTMS.
THU
N WINDS 10 TO 15 KT. SEAS 6 TO 8 FT. A CHANCE OF SHOWERS.
THU NIGHT
NE WINDS 5 TO 10 KT. SEAS 5 TO 6 FT. A CHANCE OF
SHOWERS.
FRI AND FRI NIGHT
NE WINDS AROUND 5 KT, BECOMING S. SEAS 3 TO
5 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.
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