705
FZUS51 KBOX 210203
CWFBOX
COASTAL WATERS FORECAST FOR MASSACHUSETTS AND RHODE ISLAND
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
1003 PM EDT THU AUG 20 2026
COASTAL WATERS FROM THE MERRIMACK RIVER MA TO WATCH HILL RI OUT
TO 60 NM
ANZ200-211500-
1003 PM EDT THU AUG 20 2026
SYNOPSIS FOR MASSACHUSETTS AND RHODE ISLAND COASTAL WATERS
WEAK LOW PRESSURE TRACKS THROUGH THE EASTERN WATERS TOWARDS
BUZZARD'S BAY THIS EVENING INTO FRIDAY. NORTHEAST WINDS AND SHOWERS
BUILD OVERNIGHT INTO FRIDAY THOUGH LIKELY REMAINING BELOW SCA
CONDITIONS FOR THE MAJORITY OF THE WATERS. UNSETTLED CONDITIONS
CONTINUE OVER THE WEEKEND WITH A STALLED FRONT POSSIBLE OVER THE
WATERS. HIGH PRESSURE MOVES IN EARLY NEXT WEEK.
ANZ250-211500-
COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK
NATIONAL MARINE SANCTUARY-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS 10 TO 15 KT. GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: NE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
2 SECONDS. A CHANCE OF RAIN. PATCHY DRIZZLE.
FRI
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
10 SECONDS. A CHANCE OF RAIN OR PATCHY DRIZZLE.
FRI NIGHT
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT AFTER
MIDNIGHT. SEAS AROUND 2 FT. WAVE DETAIL: N 2 FT AT 5 SECONDS.
RAIN LIKELY OR PATCHY DRIZZLE.
SAT
E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS AND S 2 FT AT
7 SECONDS. RAIN LIKELY OR PATCHY DRIZZLE IN THE MORNING, THEN
SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT
E WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: SE
3 FT AT 3 SECONDS AND E 3 FT AT 6 SECONDS. SHOWERS LIKELY.
SUN
SE WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E 2 FT
AT 7 SECONDS AND W 1 FOOT AT 3 SECONDS. A CHANCE OF SHOWERS.
SUN NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT.
MON THROUGH TUE 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.
ANZ251-211500-
MASSACHUSETTS BAY AND IPSWICH BAY-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS 5 TO 10 KT, INCREASING TO 10 TO 15 KT WITH
GUSTS UP TO 20 KT. SEAS AROUND 2 FT. WAVE DETAIL: E 2 FT AT
8 SECONDS AND SW 1 FOOT AT 2 SECONDS. RAIN LIKELY, THEN A CHANCE
OF RAIN OR PATCHY DRIZZLE.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: NE 2 FT AT 5 SECONDS AND N 2 FT AT 10 SECONDS.
PATCHY DRIZZLE. A CHANCE OF RAIN IN THE AFTERNOON.
FRI NIGHT
NE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL:
NE 2 FT AT 5 SECONDS. PATCHY DRIZZLE. A CHANCE OF RAIN IN THE
EVENING, THEN RAIN LIKELY AFTER MIDNIGHT.
SAT
NE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: NE
2 FT AT 5 SECONDS AND S 2 FT AT 7 SECONDS. RAIN LIKELY IN THE
MORNING, THEN SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT
NE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
NE 2 FT AT 5 SECONDS. SHOWERS LIKELY.
SUN
SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: E 2 FT
AT 6 SECONDS. A CHANCE OF SHOWERS.
SUN NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT.
MON THROUGH TUE 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.
ANZ231-211500-
CAPE COD BAY-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS 5 TO 10 KT. GUSTS UP TO 20 KT. SEAS 1 FOOT
OR LESS, THEN AROUND 2 FT. WAVE DETAIL: SW 1 FOOT AT 2 SECONDS
AND E 1 FOOT AT 9 SECONDS, BECOMING N 1 FOOT AT 4 SECONDS. RAIN.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: N 2 FT AT 4 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
AROUND 2 FT. WAVE DETAIL: NE 2 FT AT 4 SECONDS. RAIN. PATCHY
DRIZZLE AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT, DIMINISHING TO 5 TO 10 KT IN THE
AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: N 2 FT AT 4 SECONDS. A
CHANCE OF RAIN OR PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS
LIKELY IN THE AFTERNOON.
SAT NIGHT
SE WINDS AROUND 5 KT. SEAS AROUND 2 FT. WAVE DETAIL:
E 1 FOOT AT 4 SECONDS AND NW 1 FOOT AT 4 SECONDS. SHOWERS LIKELY.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE
1 FOOT AT 2 SECONDS AND NE 1 FOOT AT 4 SECONDS. A CHANCE OF
SHOWERS.
SUN NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT.
MON THROUGH TUE NIGHT
SW 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.
ANZ254-211500-
COASTAL WATERS FROM PROVINCETOWN MA TO CHATHAM MA TO NANTUCKET MA
OUT 20 NM-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
S WINDS AROUND 5 KT, BECOMING NE 10 TO 15 KT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. A SLIGHT CHANCE OF RAIN, THEN A CHANCE OF RAIN OR
PATCHY DRIZZLE.
FRI
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 SW 1 FOOT AT
3 SECONDS. RAIN.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
2 TO 3 FT. WAVE DETAIL: E 3 FT AT 5 SECONDS AND NW 1 FOOT AT
4 SECONDS. RAIN. PATCHY DRIZZLE AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS AND W 1 FOOT AT
4 SECONDS. A CHANCE OF RAIN OR PATCHY DRIZZLE IN THE MORNING,
THEN SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT AND SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 4 FT. WAVE
DETAIL: SE 3 FT AT 6 SECONDS. SHOWERS. A CHANCE OF SHOWERS IN THE
AFTERNOON.
SUN NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 4 FT. WAVE DETAIL: SW
4 FT AT 6 SECONDS AND SE 3 FT AT 9 SECONDS. A CHANCE OF SHOWERS.
MON THROUGH TUE NIGHT
SW WINDS 10 TO 15 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.
ANZ255-211500-
COASTAL WATERS EXTENDING OUT TO 25 NM SOUTH OF MARTHAS VINEYARD
AND NANTUCKET-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
SW WINDS AROUND 5 KT, BECOMING E 10 TO 15 KT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. RAIN.
FRI
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 SW 1 FOOT AT
3 SECONDS. RAIN.
FRI NIGHT
E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT AT 5 SECONDS AND SW
1 FOOT AT 5 SECONDS. RAIN. PATCHY DRIZZLE AFTER MIDNIGHT.
SAT
E WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT AT
6 SECONDS AND SW 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN OR PATCHY
DRIZZLE IN THE MORNING. SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT AND SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 4 FT. WAVE
DETAIL: SE 3 FT AT 7 SECONDS. SHOWERS. A CHANCE OF SHOWERS IN THE
AFTERNOON.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS 3 TO 5 FT. WAVE DETAIL:
S 5 FT AT 7 SECONDS AND SE 1 FOOT AT 12 SECONDS. A CHANCE OF
SHOWERS.
MON AND MON NIGHT
W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 3 TO 5 FT.
TUE AND TUE NIGHT
W WINDS 10 TO 15 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.
ANZ256-211500-
COASTAL WATERS FROM MONTAUK NY TO MARTHAS VINEYARD EXTENDING OUT
TO 20 NM SOUTH OF BLOCK ISLAND-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
S WINDS AROUND 5 KT, BECOMING E 10 TO 15 KT WITH
GUSTS UP TO 20 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT
8 SECONDS AND SW 1 FOOT AT 3 SECONDS. RAIN WITH ISOLATED TSTMS.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 25 KT. SEAS 2 TO
3 FT. WAVE DETAIL: NE 3 FT AT 5 SECONDS AND SW 1 FOOT AT
4 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS AROUND 3 FT. WAVE DETAIL: NE 3 FT AT 5 SECONDS AND
SW 1 FOOT AT 5 SECONDS. PATCHY DRIZZLE. RAIN LIKELY IN THE
EVENING, THEN A CHANCE OF RAIN AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT. SEAS AROUND 3 FT. WAVE DETAIL: NE
3 FT AT 6 SECONDS AND SW 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN OR
PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT
SE WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL:
SE 3 FT AT 6 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL: S 3 FT AT
6 SECONDS AND E 2 FT AT 9 SECONDS. A CHANCE OF SHOWERS IN THE
MORNING.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS 3 TO 5 FT.
MON AND MON NIGHT
W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 3 TO 5 FT.
TUE AND TUE NIGHT
W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 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.
ANZ232-211500-
NANTUCKET SOUND-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
W WINDS AROUND 5 KT, BECOMING N 10 TO 15 KT. SEAS
AROUND 2 FT. WAVE DETAIL: SW 1 FOOT AT 3 SECONDS AND E 1 FOOT AT
8 SECONDS. A CHANCE OF RAIN, THEN RAIN.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: NE 2 FT AT 4 SECONDS AND SW 1 FOOT AT
3 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
2 TO 3 FT. WAVE DETAIL: E 3 FT AT 4 SECONDS AND SW 1 FOOT AT
5 SECONDS. RAIN. PATCHY DRIZZLE AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: E 2 FT
AT 5 SECONDS AND SW 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN OR
PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT AND SUN
S WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE
DETAIL: S 2 FT AT 3 SECONDS AND E 2 FT AT 5 SECONDS. SHOWERS. A
CHANCE OF SHOWERS IN THE AFTERNOON.
SUN NIGHT
SW WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S
2 FT AT 4 SECONDS AND E 1 FOOT AT 7 SECONDS. A CHANCE OF SHOWERS.
MON THROUGH TUE NIGHT
SW WINDS 15 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.
ANZ233-211500-
VINEYARD SOUND-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
NW WINDS AROUND 5 KT, BECOMING NE 10 TO 15 KT. SEAS
AROUND 2 FT. WAVE DETAIL: SW 1 FOOT AT 4 SECONDS AND SE 1 FOOT AT
8 SECONDS. RAIN.
FRI
NE 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
4 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS AROUND 2 FT. WAVE DETAIL: NE 2 FT AT 4 SECONDS AND
SW 1 FOOT AT 5 SECONDS. RAIN. PATCHY DRIZZLE AFTER MIDNIGHT.
SAT
NE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: NE
1 FOOT AT 4 SECONDS AND SW 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN
OR PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
NE 1 FOOT AT 5 SECONDS AND S 1 FOOT AT 5 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: S 2 FT
AT 4 SECONDS AND SE 1 FOOT AT 8 SECONDS. A CHANCE OF SHOWERS.
SUN NIGHT
SW WINDS 5 TO 10 KT. SEAS 2 TO 3 FT.
MON THROUGH TUE NIGHT
SW WINDS 10 TO 15 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.
ANZ234-211500-
BUZZARDS BAY-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS AROUND 5 KT, BECOMING NE. SEAS AROUND 2 FT.
WAVE DETAIL: SW 1 FOOT AT 3 SECONDS AND SE 1 FOOT AT 8 SECONDS.
RAIN.
FRI
NE 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
3 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL:
NE 2 FT AT 3 SECONDS AND SW 1 FOOT AT 5 SECONDS. RAIN. PATCHY
DRIZZLE AFTER MIDNIGHT.
SAT
NE WINDS 10 TO 15 KT, DIMINISHING TO 5 TO 10 KT IN THE
AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: NE 1 FOOT AT 3 SECONDS
AND SW 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN OR PATCHY DRIZZLE IN
THE MORNING, THEN SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
NE 1 FOOT AT 2 SECONDS AND S 1 FOOT AT 5 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE
1 FOOT AT 3 SECONDS. SHOWERS LIKELY IN THE MORNING. A CHANCE OF
SHOWERS IN THE AFTERNOON.
SUN NIGHT
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT.
MON THROUGH TUE NIGHT
SW WINDS 15 TO 20 KT WITH GUSTS UP TO
25 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.
ANZ235-211500-
RHODE ISLAND SOUND-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
W WINDS AROUND 5 KT, BECOMING N 10 TO 15 KT WITH
GUSTS UP TO 20 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT
8 SECONDS AND SW 1 FOOT AT 3 SECONDS. RAIN.
FRI
NE WINDS 10 TO 15 KT, INCREASING TO 15 TO 20 KT IN THE
AFTERNOON. SEAS 2 TO 3 FT. WAVE DETAIL: NE 3 FT AT 5 SECONDS AND
S 1 FOOT AT 4 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS AROUND 2 FT. WAVE DETAIL: NE 2 FT AT 5 SECONDS AND
SW 1 FOOT AT 5 SECONDS. RAIN LIKELY. PATCHY DRIZZLE AFTER
MIDNIGHT.
SAT
NE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: NE 3 FT
AT 5 SECONDS AND SW 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN OR
PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT
E WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: SE
2 FT AT 6 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S 3 FT AT
6 SECONDS AND SE 2 FT AT 10 SECONDS. A CHANCE OF SHOWERS IN THE
MORNING.
SUN NIGHT
SW WINDS 10 TO 15 KT. SEAS 2 TO 4 FT.
MON THROUGH TUE NIGHT
SW WINDS 15 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.
ANZ237-211500-
BLOCK ISLAND SOUND-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS AROUND 5 KT, BECOMING NE 10 TO 15 KT WITH
GUSTS UP TO 20 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT
8 SECONDS AND SW 1 FOOT AT 3 SECONDS. RAIN. ISOLATED TSTMS.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: NE 3 FT AT 5 SECONDS AND S 1 FOOT AT
5 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS 2 TO 3 FT. WAVE DETAIL: NE 3 FT AT 5 SECONDS AND S
1 FOOT AT 5 SECONDS. PATCHY DRIZZLE. RAIN LIKELY IN THE EVENING,
THEN A CHANCE OF RAIN AFTER MIDNIGHT.
SAT
NE WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: NE 3 FT
AT 6 SECONDS AND S 1 FOOT AT 5 SECONDS. A CHANCE OF RAIN OR
PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT
E WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E
2 FT AT 6 SECONDS AND S 1 FOOT AT 5 SECONDS. SHOWERS LIKELY.
SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S 2 FT AT
5 SECONDS AND E 2 FT AT 8 SECONDS. A CHANCE OF SHOWERS IN THE
MORNING.
SUN NIGHT
SW WINDS 5 TO 10 KT. SEAS 2 TO 4 FT.
MON THROUGH TUE NIGHT
SW WINDS 10 TO 15 KT WITH GUSTS UP TO
20 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.
ANZ230-211500-
BOSTON HARBOR-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS AROUND 10 KT. WAVES AROUND 2 FT. RAIN.
PATCHY DRIZZLE.
FRI
NE WINDS 10 TO 15 KT. WAVES AROUND 2 FT. PATCHY DRIZZLE. A
CHANCE OF RAIN IN THE AFTERNOON.
FRI NIGHT
NE WINDS 10 TO 15 KT. WAVES 1 FOOT OR LESS, THEN
AROUND 2 FT AFTER MIDNIGHT. RAIN LIKELY OR PATCHY DRIZZLE.
SAT
NE WINDS 10 TO 15 KT. WAVES AROUND 2 FT. RAIN LIKELY OR
PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. SHOWERS
LIKELY.
SUN AND SUN NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. A
CHANCE OF SHOWERS.
MON THROUGH TUE NIGHT
SW WINDS 5 TO 10 KT. WAVES 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.
ANZ236-211500-
NARRAGANSETT BAY-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
NE WINDS AROUND 5 KT, INCREASING TO 5 TO 10 KT.
WAVES AROUND 2 FT. RAIN.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. WAVES AROUND
2 FT. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. WAVES AROUND 2 FT. RAIN
LIKELY. PATCHY DRIZZLE AFTER MIDNIGHT.
SAT
NE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A CHANCE OF RAIN
OR PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE
AFTERNOON.
SAT NIGHT
NE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. SHOWERS.
SUN
S WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A CHANCE OF SHOWERS
IN THE MORNING.
SUN NIGHT
SW WINDS 5 TO 10 KT. WAVES 2 TO 3 FT.
MON THROUGH TUE NIGHT
SW WINDS 10 TO 15 KT WITH GUSTS UP TO
20 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.
ANZ280-211500-
OCEAN WATERS FROM THE MERRIMACK RIVER TO PLYMOUTH FROM 40 TO
60 NM-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
N WINDS 5 TO 10 KT, INCREASING TO 10 TO 15 KT. SEAS
AROUND 2 FT. WAVE DETAIL: NW 2 FT AT 3 SECONDS AND E 2 FT AT
8 SECONDS. A CHANCE OF RAIN. PATCHY DRIZZLE.
FRI
NE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: N 3 FT
AT 6 SECONDS AND W 2 FT AT 5 SECONDS. PATCHY DRIZZLE.
FRI NIGHT
E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT AFTER
MIDNIGHT. SEAS 2 TO 3 FT. WAVE DETAIL: N 3 FT AT 5 SECONDS. A
CHANCE OF RAIN OR PATCHY DRIZZLE.
SAT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: NE 3 FT AT 5 SECONDS. RAIN LIKELY OR PATCHY
DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT
SE WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL:
SE 3 FT AT 5 SECONDS. SHOWERS LIKELY.
SUN
S WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL: SE 3 FT
AT 7 SECONDS AND SW 2 FT AT 5 SECONDS. A CHANCE OF SHOWERS.
SUN NIGHT
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
3 TO 4 FT.
MON THROUGH TUE NIGHT
SW WINDS 10 TO 15 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.
ANZ281-211500-
OCEAN WATERS FROM PROVINCETOWN TO NANTUCKET FROM 20 TO 60 NM-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
S WINDS AROUND 5 KT, BECOMING E. SEAS AROUND 2 FT.
WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 4 SECONDS. A
SLIGHT CHANCE OF RAIN OR PATCHY DRIZZLE.
FRI
NE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: NE 3 FT
AT 7 SECONDS AND W 1 FOOT AT 3 SECONDS. PATCHY DRIZZLE. A CHANCE
OF RAIN IN THE MORNING, THEN RAIN LIKELY IN THE AFTERNOON.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
2 TO 3 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS AND NW 1 FOOT AT
4 SECONDS. RAIN.
SAT
SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS AND W 1 FOOT AT 5 SECONDS.
RAIN LIKELY OR PATCHY DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY
IN THE AFTERNOON.
SAT NIGHT
S WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL: S
3 FT AT 5 SECONDS AND E 3 FT AT 8 SECONDS. SHOWERS.
SUN AND SUN NIGHT
S WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. WAVE
DETAIL: S 5 FT AT 7 SECONDS AND SE 2 FT AT 9 SECONDS. A CHANCE OF
SHOWERS.
MON
SW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 4 TO
5 FT. A CHANCE OF SHOWERS.
MON NIGHT THROUGH TUE NIGHT
SW WINDS 10 TO 15 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.
ANZ282-211500-
OCEAN WATERS FROM MARTHAS VINEYARD TO NANTUCKET FROM 25 TO 60 NM-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
SW WINDS AROUND 5 KT, BECOMING E. SEAS 2 TO 3 FT.
WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 3 SECONDS. A
SLIGHT CHANCE OF RAIN. RAIN LIKELY WITH POSSIBLE TSTMS OR
DRIZZLE.
FRI
E WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT
AT 7 SECONDS AND W 1 FOOT AT 3 SECONDS. RAIN.
FRI NIGHT
SE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E
3 FT AT 6 SECONDS AND SW 1 FOOT AT 5 SECONDS. RAIN. PATCHY
DRIZZLE AFTER MIDNIGHT.
SAT
S WINDS AROUND 10 KT. SEAS 2 TO 4 FT. WAVE DETAIL: E 3 FT
AT 7 SECONDS AND S 2 FT AT 5 SECONDS. A CHANCE OF RAIN OR PATCHY
DRIZZLE IN THE MORNING, THEN SHOWERS LIKELY WITH A CHANCE OF
TSTMS IN THE AFTERNOON.
SAT NIGHT
S WINDS AROUND 10 KT. SEAS 3 TO 5 FT. WAVE DETAIL: S
3 FT AT 5 SECONDS AND E 2 FT AT 8 SECONDS. SHOWERS. A CHANCE OF
TSTMS IN THE EVENING.
SUN
S WINDS AROUND 10 KT. SEAS 4 TO 5 FT. WAVE DETAIL: S 4 FT
AT 6 SECONDS AND SE 2 FT AT 10 SECONDS. SHOWERS LIKELY IN THE
MORNING. A CHANCE OF SHOWERS IN THE AFTERNOON.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS 4 TO 6 FT. A CHANCE OF
SHOWERS. A CHANCE OF TSTMS IN THE EVENING.
MON
SW WINDS 10 TO 15 KT. SEAS 4 TO 6 FT. A CHANCE OF SHOWERS.
MON NIGHT THROUGH TUE NIGHT
SW WINDS 10 TO 15 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.
ANZ283-211500-
OCEAN WATERS FROM MONTAUK NY TO MARTHAS VINEYARD FROM 25 TO 60 NM-
1003 PM EDT THU AUG 20 2026
OVERNIGHT
SW WINDS AROUND 5 KT, BECOMING E 10 TO 15 KT WITH
GUSTS UP TO 20 KT. SEAS 2 TO 3 FT. WAVE DETAIL: SE 2 FT AT
9 SECONDS AND W 1 FOOT AT 3 SECONDS. RAIN WITH ISOLATED TSTMS.
FRI
E 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 W 1 FOOT AT
5 SECONDS. RAIN.
FRI NIGHT
NE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL:
NE 3 FT AT 6 SECONDS AND SW 1 FOOT AT 5 SECONDS. RAIN. PATCHY
DRIZZLE AFTER MIDNIGHT.
SAT
NE WINDS AROUND 10 KT, BECOMING SE IN THE AFTERNOON. SEAS
3 TO 5 FT. WAVE DETAIL: NE 3 FT AT 7 SECONDS AND S 2 FT AT
5 SECONDS. A CHANCE OF RAIN OR PATCHY DRIZZLE IN THE MORNING.
SHOWERS LIKELY IN THE AFTERNOON.
SAT NIGHT
S WINDS AROUND 10 KT. SEAS 3 TO 5 FT. WAVE DETAIL: S
2 FT AT 5 SECONDS AND E 2 FT AT 8 SECONDS. SHOWERS.
SUN
S WINDS AROUND 10 KT. SEAS 3 TO 5 FT. WAVE DETAIL: S 5 FT
AT 6 SECONDS AND E 2 FT AT 10 SECONDS. A CHANCE OF SHOWERS. A
CHANCE OF TSTMS IN THE MORNING.
SUN NIGHT
SW WINDS 10 TO 15 KT. SEAS 4 TO 6 FT. A CHANCE OF
SHOWERS.
MON
W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 4 TO
6 FT.
MON NIGHT THROUGH TUE NIGHT
SW WINDS 10 TO 15 KT WITH GUSTS UP
TO 20 KT. SEAS 3 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.
FOR THE LATEST UPDATES...PLEASE VISIT OUR WEBPAGE AT
WWW.WEATHER.GOV/BOSTON
YOU CAN FOLLOW US ON FACEBOOK AT
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.BOSTON.GOV
YOU CAN FOLLOW US ON TWITTER AT
@NWSBOSTON
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page