229
FZUS51 KBOX 201403
CWFBOX
COASTAL WATERS FORECAST FOR MASSACHUSETTS AND RHODE ISLAND
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
1003 AM EDT THU AUG 20 2026
COASTAL WATERS FROM THE MERRIMACK RIVER MA TO WATCH HILL RI OUT
TO 60 NM
ANZ200-210300-
1003 AM EDT THU AUG 20 2026
SYNOPSIS FOR MASSACHUSETTS AND RHODE ISLAND COASTAL WATERS
A WEAK TROUGH OF LOW PRES MOVES THROUGH THU. WEAK LOW PRES MAY SIT
IN THE EASTERN WATERS FRI. UNSETTLED CONDITIONS CONTINUE OVER THE
WEEKEND WITH A STALLED FRONT POSSIBLE OVER THE WATERS.
ANZ250-210300-
COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK
NATIONAL MARINE SANCTUARY-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
NW WINDS AROUND 5 KT, BECOMING E. SEAS AROUND
2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
2 SECONDS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING N AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
2 SECONDS. A CHANCE OF SHOWERS.
FRI
NE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: NE
2 FT AT 7 SECONDS AND NW 1 FOOT AT 3 SECONDS. A CHANCE OF
SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: E
2 FT AT 7 SECONDS AND SW 2 FT AT 16 SECONDS. A CHANCE OF SHOWERS
AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: E 3 FT AT 7 SECONDS AND N 1 FOOT AT 3 SECONDS.
SHOWERS LIKELY IN THE MORNING, THEN SHOWERS IN THE AFTERNOON.
SAT NIGHT
E WINDS 5 TO 10 KT, BECOMING N AFTER MIDNIGHT. SEAS
2 TO 4 FT. WAVE DETAIL: SE 4 FT AT 6 SECONDS. SHOWERS LIKELY.
SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON NIGHT
W 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.
ANZ251-210300-
MASSACHUSETTS BAY AND IPSWICH BAY-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
NW WINDS AROUND 5 KT, BECOMING E. SEAS AROUND
2 FT. WAVE DETAIL: E 2 FT AT 8 SECONDS AND W 1 FOOT AT 2 SECONDS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING N AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: E 2 FT AT 8 SECONDS AND SW 1 FOOT AT
2 SECONDS. SHOWERS LIKELY, MAINLY IN THE EVENING.
FRI
NE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: NE
2 FT AT 6 SECONDS AND NW 1 FOOT AT 3 SECONDS. A CHANCE OF
SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: E
2 FT AT 7 SECONDS AND N 2 FT AT 17 SECONDS. A CHANCE OF SHOWERS.
SAT
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: E 2 FT AT 6 SECONDS AND N 1 FOOT AT 3 SECONDS.
SHOWERS LIKELY IN THE MORNING, THEN SHOWERS IN THE AFTERNOON.
SAT NIGHT
NE WINDS 5 TO 10 KT, BECOMING N AFTER MIDNIGHT. SEAS
2 TO 3 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS. SHOWERS LIKELY,
MAINLY IN THE EVENING.
SUN
SE WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON NIGHT
W 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.
ANZ231-210300-
CAPE COD BAY-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
NW WINDS AROUND 5 KT, BECOMING E. SEAS 1 FOOT
OR LESS. WAVE DETAIL: SW 1 FOOT AT 2 SECONDS AND E 1 FOOT AT
6 SECONDS.
TONIGHT
NW WINDS AROUND 5 KT, BECOMING NE AFTER MIDNIGHT. SEAS
1 FOOT OR LESS. WAVE DETAIL: SW 1 FOOT AT 2 SECONDS AND E 1 FOOT
AT 5 SECONDS. A CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS
LIKELY AFTER MIDNIGHT.
FRI
NE WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE DETAIL: N
1 FOOT AT 3 SECONDS. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: E 1 FOOT AT 3 SECONDS AND N 1 FOOT AT 3 SECONDS. A CHANCE
OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: NE
1 FOOT AT 4 SECONDS. SHOWERS. PATCHY FOG IN THE MORNING. VSBY
1 TO 3 NM.
SAT NIGHT
SE WINDS 5 TO 10 KT, BECOMING SW AFTER MIDNIGHT.
SEAS AROUND 2 FT. WAVE DETAIL: S 1 FOOT AT 2 SECONDS AND E 1 FOOT
AT 3 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON NIGHT
W 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.
ANZ254-210300-
COASTAL WATERS FROM PROVINCETOWN MA TO CHATHAM MA TO NANTUCKET MA
OUT 20 NM-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 3 SECONDS. PATCHY
FOG. VSBY 1 TO 3 NM, DECREASING TO 1 NM OR LESS.
TONIGHT
SW WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS AFTER MIDNIGHT. VSBY
1 NM OR LESS.
FRI
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: E 2 FT
AT 6 SECONDS AND W 1 FOOT AT 3 SECONDS. A CHANCE OF SHOWERS.
PATCHY FOG IN THE MORNING WITH VSBY 1 NM OR LESS.
FRI NIGHT
E WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: NE
3 FT AT 7 SECONDS AND S 1 FOOT AT 3 SECONDS. PATCHY FOG. A CHANCE
OF SHOWERS.
SAT
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
3 SECONDS. SHOWERS. PATCHY FOG IN THE MORNING WITH VSBY 1 TO
3 NM.
SAT NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 4 FT. WAVE DETAIL: SE
3 FT AT 6 SECONDS. SHOWERS.
SUN AND SUN NIGHT
S WINDS 5 TO 10 KT. SEAS 2 TO 4 FT. A CHANCE
OF SHOWERS.
MON AND MON NIGHT
SW WINDS 10 TO 15 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.
ANZ255-210300-
COASTAL WATERS EXTENDING OUT TO 25 NM SOUTH OF MARTHAS VINEYARD
AND NANTUCKET-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 4 SECONDS. PATCHY
FOG WITH VSBY 1 TO 3 NM.
TONIGHT
W WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS AFTER MIDNIGHT. VSBY
1 NM OR LESS.
FRI
E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS AROUND 2 FT. WAVE DETAIL: E 2 FT AT 6 SECONDS AND SW 1 FOOT
AT 3 SECONDS. A CHANCE OF SHOWERS. PATCHY FOG IN THE MORNING WITH
VSBY 1 NM OR LESS.
FRI NIGHT
E WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: SE
3 FT AT 5 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS IN THE
EVENING. SHOWERS LIKELY AFTER MIDNIGHT.
SAT
SE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT
AT 5 SECONDS. SHOWERS. PATCHY FOG IN THE MORNING.
SAT NIGHT
S WINDS AROUND 10 KT. SEAS 2 TO 4 FT. WAVE DETAIL:
SE 3 FT AT 7 SECONDS. SHOWERS.
SUN
S WINDS AROUND 10 KT. SEAS 3 TO 4 FT. SHOWERS LIKELY.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS 2 TO 3 FT. A CHANCE OF
SHOWERS.
MON AND MON 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.
ANZ256-210300-
COASTAL WATERS FROM MONTAUK NY TO MARTHAS VINEYARD EXTENDING OUT
TO 20 NM SOUTH OF BLOCK ISLAND-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 3 SECONDS.
TONIGHT
NW WINDS AROUND 10 KT, BECOMING NE AFTER MIDNIGHT.
SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND W 1 FOOT
AT 3 SECONDS. SHOWERS LIKELY. PATCHY FOG AFTER MIDNIGHT WITH VSBY
1 TO 3 NM.
FRI
NE 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 SW 1 FOOT AT
3 SECONDS. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL:
NE 3 FT AT 5 SECONDS AND S 1 FOOT AT 5 SECONDS. PATCHY FOG. A
CHANCE OF SHOWERS IN THE EVENING. SHOWERS LIKELY AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT, BECOMING SE IN THE AFTERNOON. GUSTS
UP TO 20 KT. SEAS AROUND 3 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS
AND S 2 FT AT 5 SECONDS. SHOWERS. PATCHY FOG IN THE MORNING. VSBY
1 TO 3 NM.
SAT NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 3 FT. WAVE DETAIL:
SE 3 FT AT 7 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 3 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON 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.
ANZ232-210300-
NANTUCKET SOUND-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SW 1 FOOT AT 3 SECONDS AND E 1 FOOT AT 7 SECONDS.
TONIGHT
W WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. SEAS
AROUND 2 FT IN THE EVENING, THEN 1 FOOT OR LESS. WAVE DETAIL: SW
1 FOOT AT 3 SECONDS AND E 1 FOOT AT 8 SECONDS, BECOMING W 1 FOOT
AT 3 SECONDS AND NE 1 FOOT AT 8 SECONDS. SHOWERS LIKELY AFTER
MIDNIGHT.
FRI
NE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: E
2 FT AT 4 SECONDS AND SW 1 FOOT AT 3 SECONDS. A CHANCE OF
SHOWERS.
FRI NIGHT
E WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL:
E 2 FT AT 4 SECONDS AND S 1 FOOT AT 4 SECONDS. PATCHY FOG. A
CHANCE OF SHOWERS IN THE EVENING. SHOWERS LIKELY AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: SE 2 FT AT 4 SECONDS. SHOWERS. PATCHY FOG IN
THE MORNING. VSBY 1 TO 3 NM.
SAT NIGHT
S WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SE 2 FT AT 5 SECONDS. SHOWERS.
SUN
S WINDS AROUND 10 KT. SEAS AROUND 2 FT. SHOWERS LIKELY.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS.
MON AND MON NIGHT
W WINDS 10 TO 15 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.
ANZ233-210300-
VINEYARD SOUND-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SW 1 FOOT AT 4 SECONDS AND SE 1 FOOT AT 8 SECONDS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. SEAS
1 FOOT OR LESS. WAVE DETAIL: SW 1 FOOT AT 4 SECONDS AND SE 1 FOOT
AT 8 SECONDS. A CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS
LIKELY AFTER MIDNIGHT. PATCHY FOG AFTER MIDNIGHT.
FRI
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS AROUND 2 FT. WAVE DETAIL: NE 1 FOOT AT 3 SECONDS AND SW
1 FOOT AT 4 SECONDS. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: NE 1 FOOT AT 3 SECONDS AND S 1 FOOT AT 5 SECONDS. PATCHY
FOG. A CHANCE OF SHOWERS IN THE EVENING. SHOWERS LIKELY AFTER
MIDNIGHT.
SAT
E WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: NE
1 FOOT AT 4 SECONDS AND S 1 FOOT AT 5 SECONDS. SHOWERS. PATCHY
FOG IN THE MORNING. VSBY 1 TO 3 NM.
SAT NIGHT
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SE 2 FT AT 5 SECONDS. SHOWERS LIKELY.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON 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.
ANZ234-210300-
BUZZARDS BAY-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SW 1 FOOT AT 3 SECONDS AND SE 1 FOOT AT 10 SECONDS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. SEAS
1 FOOT OR LESS. WAVE DETAIL: W 1 FOOT AT 3 SECONDS AND SE 1 FOOT
AT 8 SECONDS. A CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS
LIKELY AFTER MIDNIGHT. PATCHY FOG AFTER MIDNIGHT.
FRI
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS AROUND 2 FT IN THE MORNING, THEN 1 FOOT OR LESS. WAVE
DETAIL: NE 1 FOOT AT 2 SECONDS AND SW 1 FOOT AT 3 SECONDS,
BECOMING NE 1 FOOT AT 3 SECONDS AND S 1 FOOT AT 5 SECONDS. A
CHANCE OF SHOWERS. PATCHY FOG IN THE MORNING.
FRI NIGHT
NE WINDS AROUND 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: NE 1 FOOT AT 2 SECONDS AND S 1 FOOT AT 5 SECONDS. PATCHY
FOG. A CHANCE OF SHOWERS IN THE EVENING. SHOWERS LIKELY AFTER
MIDNIGHT.
SAT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: NE 1 FOOT AT 3 SECONDS. SHOWERS. PATCHY FOG IN
THE MORNING. VSBY 1 TO 3 NM.
SAT NIGHT
SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SE 1 FOOT AT 4 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON 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.
ANZ235-210300-
RHODE ISLAND SOUND-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: S 2 FT AT 6 SECONDS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING NE 10 TO 15 KT AFTER
MIDNIGHT. SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND
SW 1 FOOT AT 3 SECONDS. SHOWERS LIKELY. PATCHY FOG AFTER
MIDNIGHT.
FRI
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS AROUND 2 FT. WAVE DETAIL: NE 2 FT AT 5 SECONDS AND S 1 FOOT
AT 4 SECONDS. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL:
NE 2 FT AT 5 SECONDS AND S 1 FOOT AT 5 SECONDS. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS LIKELY AFTER MIDNIGHT.
PATCHY FOG AFTER MIDNIGHT.
SAT
E 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. SHOWERS. PATCHY FOG IN
THE MORNING. VSBY 1 TO 3 NM.
SAT NIGHT
E WINDS AROUND 10 KT, BECOMING SE AFTER MIDNIGHT.
SEAS 2 TO 3 FT. WAVE DETAIL: S 3 FT AT 6 SECONDS AND SE 3 FT AT
10 SECONDS. SHOWERS LIKELY.
SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON 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.
ANZ237-210300-
BLOCK ISLAND SOUND-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 7 SECONDS AND SW 1 FOOT AT 4 SECONDS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND W 1 FOOT AT
3 SECONDS. SHOWERS LIKELY. PATCHY FOG AFTER MIDNIGHT.
FRI
NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS AROUND 2 FT. WAVE DETAIL: NE 2 FT AT 5 SECONDS AND S 1 FOOT
AT 5 SECONDS. A CHANCE OF SHOWERS. PATCHY FOG IN THE MORNING.
FRI NIGHT
NE WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: E 2 FT AT 5 SECONDS AND SW 1 FOOT AT 5 SECONDS. A CHANCE
OF SHOWERS IN THE EVENING, THEN SHOWERS LIKELY AFTER MIDNIGHT.
PATCHY FOG AFTER MIDNIGHT.
SAT
NE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT
AT 5 SECONDS AND SW 1 FOOT AT 5 SECONDS. SHOWERS. PATCHY FOG IN
THE MORNING. VSBY 1 TO 3 NM.
SAT NIGHT
NE WINDS 5 TO 10 KT, BECOMING SE AFTER MIDNIGHT.
SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 6 SECONDS. SHOWERS.
SUN
S WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF SHOWERS.
SUN NIGHT THROUGH MON NIGHT
W WINDS 10 TO 15 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.
ANZ230-210300-
BOSTON HARBOR-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS AROUND 5 KT, BECOMING E. WAVES 1 FOOT
OR LESS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. SHOWERS
LIKELY, MAINLY IN THE EVENING.
FRI
NE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A CHANCE OF
SHOWERS.
FRI NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. A CHANCE
OF SHOWERS.
SAT
NE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. WAVES AROUND
2 FT. SHOWERS LIKELY IN THE MORNING, THEN SHOWERS IN THE
AFTERNOON.
SAT NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. SHOWERS,
MAINLY IN THE EVENING.
SUN AND SUN NIGHT
SE WINDS 5 TO 10 KT, BECOMING SW. WAVES
1 FOOT OR LESS. A CHANCE OF SHOWERS.
MON AND MON NIGHT
W 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.
ANZ236-210300-
NARRAGANSETT BAY-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
W WINDS AROUND 5 KT, BECOMING S. WAVES 1 FOOT
OR LESS.
TONIGHT
NW WINDS 5 TO 10 KT, BECOMING NE AFTER MIDNIGHT. WAVES
1 FOOT OR LESS. SHOWERS LIKELY. PATCHY FOG AFTER MIDNIGHT.
FRI
NE WINDS 10 TO 15 KT. WAVES 1 FOOT OR LESS, THEN AROUND
2 FT IN THE AFTERNOON. A CHANCE OF SHOWERS. PATCHY FOG IN THE
MORNING.
FRI NIGHT
NE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS LIKELY AFTER MIDNIGHT.
PATCHY FOG AFTER MIDNIGHT.
SAT
NE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. SHOWERS. PATCHY
FOG IN THE MORNING. VSBY 1 TO 3 NM.
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.
SUN NIGHT THROUGH MON NIGHT
W WINDS 10 TO 15 KT WITH GUSTS UP
TO 20 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.
ANZ280-210300-
OCEAN WATERS FROM THE MERRIMACK RIVER TO PLYMOUTH FROM 40 TO
60 NM-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
W WINDS AROUND 5 KT, BECOMING S. SEAS 2 TO
3 FT. WAVE DETAIL: SE 2 FT AT 7 SECONDS AND SW 1 FOOT AT
3 SECONDS.
TONIGHT
SW WINDS 5 TO 10 KT, BECOMING N AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. A CHANCE OF SHOWERS. PATCHY FOG AFTER MIDNIGHT.
FRI
NE WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: NE 3 FT
AT 7 SECONDS AND W 1 FOOT AT 5 SECONDS.
FRI NIGHT
E WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: E
2 FT AT 7 SECONDS AND NW 1 FOOT AT 4 SECONDS. A CHANCE OF SHOWERS
AFTER MIDNIGHT.
SAT
E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
4 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS AND NW 1 FOOT AT
3 SECONDS. A CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS IN
THE AFTERNOON.
SAT NIGHT
SE WINDS 10 TO 15 KT, BECOMING S AFTER MIDNIGHT.
GUSTS UP TO 20 KT. SEAS 3 TO 5 FT. WAVE DETAIL: SE 3 FT AT
5 SECONDS. SHOWERS IN THE EVENING. A CHANCE OF SHOWERS AFTER
MIDNIGHT.
SUN
S WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. A CHANCE OF SHOWERS.
SUN NIGHT
S WINDS AROUND 10 KT WITH GUSTS UP TO 20 KT. SEAS
AROUND 3 FT. A CHANCE OF SHOWERS.
MON AND MON NIGHT
SW WINDS 10 TO 15 KT. 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.
ANZ281-210300-
OCEAN WATERS FROM PROVINCETOWN TO NANTUCKET FROM 20 TO 60 NM-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS AROUND 5 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 4 SECONDS. PATCHY
FOG. VSBY 1 NM OR LESS.
TONIGHT
SW WINDS AROUND 5 KT, BECOMING E AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS AFTER MIDNIGHT. VSBY
1 NM OR LESS.
FRI
E WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E 3 FT AT
7 SECONDS AND W 1 FOOT AT 3 SECONDS. PATCHY FOG IN THE MORNING. A
CHANCE OF SHOWERS IN THE AFTERNOON. VSBY 1 NM OR LESS IN THE
MORNING.
FRI NIGHT
E WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL:
NE 2 FT AT 7 SECONDS AND SW 1 FOOT AT 3 SECONDS. A CHANCE OF
SHOWERS. PATCHY FOG AFTER MIDNIGHT.
SAT
SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
4 FT. WAVE DETAIL: E 3 FT AT 6 SECONDS AND N 1 FOOT AT 4 SECONDS.
SHOWERS.
SAT NIGHT
S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
3 TO 4 FT. WAVE DETAIL: SE 4 FT AT 7 SECONDS. SHOWERS. A CHANCE
OF TSTMS IN THE EVENING.
SUN AND SUN NIGHT
S WINDS AROUND 10 KT. SEAS 3 TO 4 FT. A
CHANCE OF SHOWERS.
MON AND MON NIGHT
SW WINDS AROUND 10 KT. SEAS AROUND 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.
ANZ282-210300-
OCEAN WATERS FROM MARTHAS VINEYARD TO NANTUCKET FROM 25 TO 60 NM-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS AROUND 5 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT 3 SECONDS. PATCHY
FOG. VSBY 1 NM OR LESS.
TONIGHT
SW WINDS AROUND 5 KT, BECOMING SE AFTER MIDNIGHT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 8 SECONDS AND SW 1 FOOT AT
3 SECONDS. PATCHY FOG. VSBY 1 NM OR LESS.
FRI
E WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: E
2 FT AT 9 SECONDS AND W 1 FOOT AT 3 SECONDS. PATCHY FOG IN THE
MORNING. A CHANCE OF SHOWERS IN THE AFTERNOON. VSBY 1 NM OR LESS
IN THE MORNING.
FRI NIGHT
SE WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL:
E 3 FT AT 7 SECONDS AND SW 1 FOOT AT 4 SECONDS. PATCHY FOG. A
CHANCE OF SHOWERS.
SAT
SE WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL: SE
4 FT AT 6 SECONDS. SHOWERS.
SAT NIGHT
S WINDS AROUND 10 KT. SEAS 3 TO 5 FT. WAVE DETAIL: S
5 FT AT 6 SECONDS AND E 2 FT AT 9 SECONDS. SHOWERS. A CHANCE OF
TSTMS IN THE EVENING.
SUN
S WINDS AROUND 10 KT. SEAS 3 TO 4 FT. SHOWERS LIKELY.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS 3 TO 4 FT. A CHANCE OF
SHOWERS AND TSTMS.
MON
SW WINDS AROUND 10 KT. SEAS AROUND 3 FT. A CHANCE OF
SHOWERS.
MON NIGHT
W WINDS AROUND 10 KT. SEAS AROUND 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.
ANZ283-210300-
OCEAN WATERS FROM MONTAUK NY TO MARTHAS VINEYARD FROM 25 TO 60 NM-
1003 AM EDT THU AUG 20 2026
THIS AFTERNOON
SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 8 SECONDS AND W 1 FOOT AT 3 SECONDS.
TONIGHT
W WINDS 5 TO 10 KT, BECOMING E 10 TO 15 KT AFTER
MIDNIGHT. SEAS AROUND 2 FT. WAVE DETAIL: W 2 FT AT 3 SECONDS AND
SE 2 FT AT 9 SECONDS. PATCHY FOG AFTER MIDNIGHT. A CHANCE OF
SHOWERS AFTER MIDNIGHT WITH VSBY 1 NM OR LESS.
FRI
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
3 SECONDS. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL: E
3 FT AT 6 SECONDS. A CHANCE OF SHOWERS. PATCHY FOG AFTER
MIDNIGHT.
SAT
SE WINDS 10 TO 15 KT, BECOMING S IN THE AFTERNOON. SEAS
3 TO 4 FT. WAVE DETAIL: SE 4 FT AT 6 SECONDS. SHOWERS. PATCHY FOG
IN THE MORNING.
SAT NIGHT
S WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL: S
4 FT AT 6 SECONDS AND E 3 FT AT 9 SECONDS. SHOWERS WITH A CHANCE
OF TSTMS.
SUN
SW WINDS AROUND 10 KT. SEAS 3 TO 4 FT. SHOWERS LIKELY.
SUN NIGHT
SW WINDS AROUND 10 KT. SEAS AROUND 3 FT. A CHANCE OF
SHOWERS.
MON AND MON NIGHT
W WINDS 10 TO 15 KT. SEAS AROUND 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.
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