FZUS51 KBOX 310503
CWFBOX
COASTAL WATERS FORECAST FOR MASSACHUSETTS AND RHODE ISLAND
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
103 AM EDT MON AUG 31 2026
COASTAL WATERS FROM THE MERRIMACK RIVER MA TO WATCH HILL RI OUT
TO 60 NM
  ANZ200-311800-
103 AM EDT MON AUG 31 2026
SYNOPSIS FOR MASSACHUSETTS AND RHODE ISLAND COASTAL WATERS...
A BACKDOOR COLD FRONT CROSSES THE WATERS LATE TONIGHT INTO EARLY MON
MORNING. THIS BACKDOOR FRONT WILL THEN LIFT NORTHWARD BEFORE
STALLING ACROSS THE WATERS INTO MID-WEEK. LOW PRES AND ASSOCIATED
COLD FRONT WILL CROSS THE WATERS THU INTO THU NIGHT. THIS LOW PRES
SYSTEM WILL INTENSIFY AS IT LIFTS NE TOWARDS THE CANADIAN
MARITIMES FRI AND SHIFT FURTHER EAST BY THE HOLIDAY WEEKEND. AT THE
SAME TIME...A HIGH PRES SYSTEM OVER QUEBEC WILL NOSE SOUTHWARD.
ANZ250-311800-
COASTAL WATERS EAST OF IPSWICH BAY AND THE STELLWAGEN BANK
NATIONAL MARINE SANCTUARY-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS AROUND 10 KT WITH GUSTS UP TO 20 KT.
SEAS AROUND 2 FT. WAVE DETAIL: NW 2 FT AT 3 SECONDS AND SE 2 FT
AT 8 SECONDS. MON... NE WINDS 5 TO 10 KT, BECOMING E IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: E 2 FT AT 8 SECONDS AND NW 1 FOOT AT
3 SECONDS. MON NIGHT... S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: S
1 FOOT AT 2 SECONDS AND E 1 FOOT AT 7 SECONDS. A CHANCE OF
SHOWERS AFTER MIDNIGHT. TUE... SE WINDS 5 TO 10 KT, INCREASING TO 10 TO 15 KT WITH GUSTS
UP TO 20 KT IN THE AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: SE
2 FT AT 3 SECONDS AND SE 2 FT AT 8 SECONDS. A CHANCE OF SHOWERS.
PATCHY FOG IN THE MORNING. TUE NIGHT AND WED... SE WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: SE 3 FT AT 6 SECONDS AND S 2 FT AT 3 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE DETAIL:
SE 3 FT AT 7 SECONDS AND SE 1 FOOT AT 3 SECONDS. SHOWERS WITH A
CHANCE OF TSTMS. THU... S WINDS 5 TO 10 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO 3 FT.
SHOWERS LIKELY WITH A CHANCE OF TSTMS. THU NIGHT... NW WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF
SHOWERS. FRI AND FRI NIGHT... N WINDS 5 TO 10 KT, INCREASING TO 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.
ANZ251-311800-
MASSACHUSETTS BAY AND IPSWICH BAY-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: W 1 FOOT AT 3 SECONDS AND E 1 FOOT AT 8 SECONDS. MON... NE WINDS 5 TO 10 KT, BECOMING E IN THE AFTERNOON. SEAS
1 FOOT OR LESS. WAVE DETAIL: NW 1 FOOT AT 2 SECONDS AND E 1 FOOT
AT 8 SECONDS. MON NIGHT... S WINDS 10 TO 15 KT, DIMINISHING TO 5 TO 10 KT AFTER
MIDNIGHT. SEAS AROUND 2 FT IN THE EVENING, THEN 1 FOOT OR LESS.
WAVE DETAIL: SE 1 FOOT AT 3 SECONDS AND E 1 FOOT AT 6 SECONDS,
BECOMING S 1 FOOT AT 3 SECONDS AND E 1 FOOT AT 6 SECONDS. A
CHANCE OF SHOWERS AFTER MIDNIGHT. TUE... SE WINDS 5 TO 10 KT, INCREASING TO 10 TO 15 KT WITH GUSTS
UP TO 20 KT IN THE AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: SE
2 FT AT 4 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS. TUE NIGHT AND WED... SE WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SE 2 FT AT 4 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: E 2 FT AT 6 SECONDS AND SE 1 FOOT AT 3 SECONDS. SHOWERS
WITH A CHANCE OF TSTMS. THU... SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. SHOWERS WITH A
CHANCE OF TSTMS. THU NIGHT... NW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... N WINDS 5 TO 10 KT, INCREASING TO 10 TO
15 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.
ANZ231-311800-
CAPE COD BAY
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: NW 1 FOOT AT 3 SECONDS AND SE 1 FOOT AT 8 SECONDS. A
CHANCE OF SHOWERS. MON... N WINDS 5 TO 10 KT, BECOMING E IN THE AFTERNOON. SEAS
AROUND 2 FT IN THE MORNING, THEN 1 FOOT OR LESS. WAVE DETAIL: NW
1 FOOT AT 3 SECONDS AND E 1 FOOT AT 8 SECONDS, BECOMING N 1 FOOT
AT 3 SECONDS. MON NIGHT... S WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SE 1 FOOT AT 3 SECONDS AND NE 1 FOOT AT 4 SECONDS. A
CHANCE OF SHOWERS AFTER MIDNIGHT. TUE... SE WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
SEAS AROUND 2 FT. WAVE DETAIL: S 1 FOOT AT 2 SECONDS AND NE
1 FOOT AT 4 SECONDS. PATCHY FOG. SHOWERS LIKELY. TUE NIGHT AND WED... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: E 1 FOOT AT 3 SECONDS. WED NIGHT... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
E 1 FOOT AT 3 SECONDS. A CHANCE OF SHOWERS IN THE EVENING, THEN
SHOWERS LIKELY WITH A CHANCE OF TSTMS AFTER MIDNIGHT. THU... SW WINDS 5 TO 10 KT. SEAS AROUND 2 FT. SHOWERS LIKELY WITH
A CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... N WINDS 5 TO 10 KT, INCREASING TO 10 TO
15 KT WITH GUSTS UP TO 20 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.
ANZ254-311800-
COASTAL WATERS FROM PROVINCETOWN MA TO CHATHAM MA TO NANTUCKET MA OUT 20 NM-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 4 FT. WAVE DETAIL: W 3 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. SHOWERS.MON... N WINDS 5 TO 10 KT, BECOMING NE IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: NW 2 FT AT 4 SECONDS AND E 2 FT AT
7 SECONDS. MON NIGHT... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SW 1 FOOT AT 4 SECONDS AND SE 1 FOOT AT 7 SECONDS. PATCHY FOG
AFTER MIDNIGHT. TUE... SE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
SEAS AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 4 SECONDS AND SE 2 FT
AT 7 SECONDS. A CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS
LIKELY IN THE AFTERNOON. PATCHY FOG IN THE AFTERNOON. TUE NIGHT AND WED... E WINDS 10 TO 15 KT. SEAS 2 TO 4 FT. WAVE
DETAIL: S 3 FT AT 5 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS 3 TO 4 FT. WAVE DETAIL:
SE 4 FT AT 7 SECONDS AND SE 1 FOOT AT 4 SECONDS. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS LIKELY WITH A CHANCE OF
TSTMS AFTER MIDNIGHT. THU... S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... N WINDS 10 TO 15 KT. 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.
ANZ255-311800-
COASTAL WATERS EXTENDING OUT TO 25 NM SOUTH OF MARTHAS VINEYARD
AND NANTUCKET-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 3 TO 4 FT. WAVE DETAIL: SW 4 FT AT 5 SECONDS AND SE 1 FOOT
AT 8 SECONDS. SHOWERS WITH A SLIGHT CHANCE OF TSTMS. MON... N WINDS AROUND 10 KT, BECOMING E IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: W 3 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. MON NIGHT... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
S 1 FOOT AT 6 SECONDS. PATCHY FOG AFTER MIDNIGHT. A CHANCE OF
SHOWERS AFTER MIDNIGHT. TUE... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: SE 2 FT AT 4 SECONDS AND SE 2 FT AT 8 SECONDS.
PATCHY FOG. SHOWERS LIKELY. TUE NIGHT... E WINDS AROUND 15 KT WITH GUSTS UP TO 20 KT. SEAS
2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 5 SECONDS. A CHANCE OF
SHOWERS. WED... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 3 TO
4 FT. WAVE DETAIL: SE 3 FT AT 7 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS 3 TO 4 FT. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS LIKELY WITH A CHANCE OF
TSTMS AFTER MIDNIGHT. THU... SW WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. A CHANCE OF SHOWERS
AND TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. A CHANCE OF
SHOWERS. FRI AND FRI NIGHT... NW WINDS 10 TO 15 KT. 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.
ANZ256-311800-
COASTAL WATERS FROM MONTAUK NY TO MARTHAS VINEYARD EXTENDING OUT
TO 20 NM SOUTH OF BLOCK ISLAND-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 4 FT. WAVE DETAIL: SW 4 FT AT 5 SECONDS AND SE 1 FOOT
AT 8 SECONDS. SHOWERS LIKELY. MON... NE WINDS AROUND 10 KT, BECOMING E IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: SW 2 FT AT 5 SECONDS AND E 2 FT AT
6 SECONDS. MON NIGHT... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
S 2 FT AT 5 SECONDS. PATCHY FOG AFTER MIDNIGHT. SHOWERS LIKELY
AFTER MIDNIGHT. TUE... SE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
SEAS 2 TO 3 FT. WAVE DETAIL: S 2 FT AT 4 SECONDS AND SE 1 FOOT AT
8 SECONDS. PATCHY FOG. SHOWERS LIKELY IN THE MORNING. A CHANCE OF
SHOWERS IN THE AFTERNOON. VSBY 1 TO 3 NM IN THE MORNING. TUE NIGHT AND WED... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 4 FT. WAVE DETAIL: SE 4 FT AT 7 SECONDS AND S 2 FT AT
4 SECONDS. A CHANCE OF SHOWERS THROUGH THE NIGHT. A CHANCE OF
SHOWERS IN THE AFTERNOON. WED NIGHT... SE WINDS 10 TO 15 KT, BECOMING S AFTER MIDNIGHT.
SEAS 3 TO 4 FT. WAVE DETAIL: SE 4 FT AT 7 SECONDS AND SE 1 FOOT
AT 4 SECONDS. A CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS
LIKELY WITH A CHANCE OF TSTMS AFTER MIDNIGHT. THU AND THU NIGHT... SW WINDS 10 TO 15 KT, BECOMING W. SEAS
AROUND 3 FT. A CHANCE OF SHOWERS AND TSTMS. FRI AND FRI NIGHT... NW WINDS 5 TO 10 KT, INCREASING TO 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.
ANZ232-311800-
NANTUCKET SOUND-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 3 FT. WAVE DETAIL: W 3 FT AT 4 SECONDS AND SE 1 FOOT AT
8 SECONDS. SHOWERS WITH A SLIGHT CHANCE OF TSTMS. MON... N WINDS 10 TO 15 KT, BECOMING E 5 TO 10 KT IN THE
AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: NW 1 FOOT AT 4 SECONDS
AND E 1 FOOT AT 8 SECONDS. MON NIGHT... SE WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SE 1 FOOT AT 5 SECONDS. A CHANCE OF SHOWERS AFTER
MIDNIGHT. TUE... SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: SE 2 FT AT 4 SECONDS AND SE 2 FT AT 7 SECONDS.
PATCHY FOG. A CHANCE OF SHOWERS. TUE NIGHT... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
AROUND 2 FT. WAVE DETAIL: SE 2 FT AT 4 SECONDS. A CHANCE OF
SHOWERS IN THE EVENING. WED... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: SE 2 FT AT 5 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS LIKELY WITH A CHANCE OF
TSTMS AFTER MIDNIGHT. THU... SW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... N WINDS 10 TO 15 KT. GUSTS UP TO 20 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.
ANZ233-311800-
VINEYARD SOUND-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: SW 3 FT AT 5 SECONDS AND SE 1 FOOT AT 8 SECONDS. A CHANCE
OF SHOWERS. MON... N WINDS 5 TO 10 KT, BECOMING E IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: SW 2 FT AT 5 SECONDS AND E 1 FOOT AT
8 SECONDS. MON NIGHT... SE WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SE 1 FOOT AT 5 SECONDS. PATCHY FOG AFTER MIDNIGHT. A
CHANCE OF SHOWERS AFTER MIDNIGHT. TUE... SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS AROUND
2 FT. WAVE DETAIL: SE 2 FT AT 3 SECONDS AND SE 1 FOOT AT
7 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS IN THE MORNING.
SHOWERS LIKELY IN THE AFTERNOON. TUE NIGHT... E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS AROUND 2 FT. WAVE DETAIL: SE 1 FOOT AT 5 SECONDS. A
CHANCE OF SHOWERS. WED... E WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE
2 FT AT 5 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS WITH A CHANCE OF TSTMS AFTER
MIDNIGHT. THU... SW WINDS AROUND 10 KT. SEAS AROUND 2 FT. SHOWERS WITH A
CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... NW WINDS 5 TO 10 KT, INCREASING TO 10 TO
15 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.
ANZ234-311800-
BUZZARDS BAY-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS AROUND 10 KT. SEAS AROUND 2 FT. WAVE
DETAIL: SW 2 FT AT 5 SECONDS AND SE 1 FOOT AT 8 SECONDS. A CHANCE
OF SHOWERS. MON... N WINDS 5 TO 10 KT, BECOMING E IN THE AFTERNOON. SEAS
AROUND 2 FT IN THE MORNING, THEN 1 FOOT OR LESS. WAVE DETAIL: SW
1 FOOT AT 5 SECONDS AND E 1 FOOT AT 8 SECONDS, BECOMING E 1 FOOT
AT 3 SECONDS AND SW 1 FOOT AT 5 SECONDS. MON NIGHT... S WINDS 5 TO 10 KT. SEAS 1 FOOT OR LESS. WAVE
DETAIL: SE 1 FOOT AT 4 SECONDS. PATCHY FOG AFTER MIDNIGHT. A
CHANCE OF SHOWERS AFTER MIDNIGHT. TUE... SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 2 TO
3 FT. WAVE DETAIL: S 1 FOOT AT 4 SECONDS AND SE 1 FOOT AT
7 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS IN THE MORNING.
SHOWERS LIKELY IN THE AFTERNOON. TUE NIGHT... E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE
EVENING. SEAS AROUND 2 FT. WAVE DETAIL: SE 1 FOOT AT 5 SECONDS. A
CHANCE OF SHOWERS. WED... E WINDS 10 TO 15 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE
1 FOOT AT 4 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS WITH A CHANCE OF TSTMS AFTER
MIDNIGHT. THU... SW WINDS AROUND 10 KT. SEAS AROUND 2 FT. SHOWERS WITH A
CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS AROUND 2 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... NW WINDS 5 TO 10 KT, BECOMING N 10 TO 15 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.
ANZ235-311800-
RHODE ISLAND SOUND-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: SW 3 FT AT 5 SECONDS AND SE 1 FOOT AT 8 SECONDS. MON... NE WINDS 5 TO 10 KT, BECOMING SE IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: SW 2 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. MON NIGHT... 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. PATCHY FOG AFTER
MIDNIGHT. SHOWERS LIKELY AFTER MIDNIGHT. TUE... SE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
SEAS AROUND 2 FT. WAVE DETAIL: S 2 FT AT 4 SECONDS AND SE 1 FOOT
AT 8 SECONDS. PATCHY FOG. SHOWERS LIKELY. TUE NIGHT AND WED... SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 8 SECONDS AND S 2 FT AT
4 SECONDS. A CHANCE OF SHOWERS THROUGH THE NIGHT. A CHANCE OF
SHOWERS IN THE AFTERNOON. WED NIGHT... SE WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL:
SE 3 FT AT 7 SECONDS AND SE 1 FOOT AT 4 SECONDS. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS LIKELY WITH A CHANCE OF
TSTMS AFTER MIDNIGHT. THU AND THU NIGHT... SW WINDS 10 TO 15 KT, BECOMING W 5 TO 10 KT.
SEAS 2 TO 3 FT. A CHANCE OF SHOWERS AND TSTMS. FRI AND FRI NIGHT... NW WINDS 5 TO 10 KT, INCREASING TO 10 TO
15 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.
ANZ237-311800-
BLOCK ISLAND SOUND-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 5 TO 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: W 2 FT AT 5 SECONDS AND SE 1 FOOT AT 8 SECONDS. A CHANCE
OF SHOWERS. MON... NE WINDS 5 TO 10 KT, BECOMING SE IN THE AFTERNOON. SEAS
AROUND 2 FT. WAVE DETAIL: SW 2 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. MON NIGHT... S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: S
1 FOOT AT 4 SECONDS AND SE 1 FOOT AT 7 SECONDS. PATCHY FOG AFTER
MIDNIGHT. SHOWERS LIKELY AFTER MIDNIGHT. TUE... SE WINDS 5 TO 10 KT, BECOMING E 10 TO 15 KT WITH GUSTS UP
TO 20 KT IN THE AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: S 2 FT
AT 3 SECONDS AND SE 1 FOOT AT 7 SECONDS. PATCHY FOG. SHOWERS
LIKELY IN THE MORNING. A CHANCE OF SHOWERS IN THE AFTERNOON. TUE NIGHT AND WED... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 5 SECONDS. A CHANCE OF
SHOWERS THROUGH THE NIGHT. A CHANCE OF SHOWERS IN THE AFTERNOON. WED NIGHT... SE WINDS 5 TO 10 KT, BECOMING S AFTER MIDNIGHT. SEAS
2 TO 3 FT. WAVE DETAIL: SE 3 FT AT 7 SECONDS AND S 1 FOOT AT
4 SECONDS. A CHANCE OF SHOWERS IN THE EVENING. SHOWERS LIKELY
AFTER MIDNIGHT. THU AND THU NIGHT... SW WINDS AROUND 10 KT, BECOMING W. SEAS 2 TO
3 FT. A CHANCE OF SHOWERS AND TSTMS. FRI AND FRI NIGHT... NW 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.
ANZ230-311800-
BOSTON HARBOR-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. MON... NE WINDS 5 TO 10 KT, BECOMING E IN THE AFTERNOON. WAVES
1 FOOT OR LESS, THEN AROUND 2 FT IN THE AFTERNOON. MON NIGHT... S WINDS 5 TO 10 KT. WAVES AROUND 2 FT IN THE
EVENING, THEN 1 FOOT OR LESS. A CHANCE OF SHOWERS AFTER MIDNIGHT.TUE... SE WINDS 5 TO 10 KT, INCREASING TO 10 TO 15 KT WITH GUSTS
UP TO 20 KT IN THE AFTERNOON. WAVES AROUND 2 FT. PATCHY FOG.
SHOWERS IN THE MORNING. A CHANCE OF SHOWERS IN THE AFTERNOON. TUE NIGHT AND WED... SE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A
CHANCE OF SHOWERS. WED NIGHT... SE WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. SHOWERS
WITH A CHANCE OF TSTMS. THU... SW WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. SHOWERS LIKELY
WITH A CHANCE OF TSTMS. THU NIGHT... NW WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. A CHANCE
OF SHOWERS AND TSTMS. FRI AND FRI NIGHT... N 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.
ANZ236-311800-
NARRAGANSETT BAY-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 5 TO 10 KT. WAVES AROUND 2 FT. MON... N WINDS 5 TO 10 KT, BECOMING SE IN THE AFTERNOON. WAVES
AROUND 2 FT IN THE MORNING, THEN 1 FOOT OR LESS. MON NIGHT... S WINDS 5 TO 10 KT. WAVES 1 FOOT OR LESS. PATCHY FOG
AFTER MIDNIGHT. SHOWERS LIKELY AFTER MIDNIGHT. TUE... SE WINDS 5 TO 10 KT, BECOMING E 10 TO 15 KT WITH GUSTS UP
TO 20 KT IN THE AFTERNOON. WAVES AROUND 2 FT. PATCHY FOG. SHOWERS
LIKELY IN THE MORNING. A CHANCE OF SHOWERS IN THE AFTERNOON. TUE NIGHT AND WED... SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
WAVES AROUND 2 FT. A CHANCE OF SHOWERS THROUGH THE NIGHT. A
CHANCE OF SHOWERS IN THE AFTERNOON. WED NIGHT... SE WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A CHANCE OF
SHOWERS IN THE EVENING, THEN SHOWERS WITH A CHANCE OF TSTMS AFTER
MIDNIGHT. THU... SW WINDS 5 TO 10 KT. WAVES AROUND 2 FT. SHOWERS WITH A
CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. WAVES AROUND 2 FT. A CHANCE OF
SHOWERS AND TSTMS. FRI AND FRI NIGHT... NW WINDS 5 TO 10 KT. WAVES AROUND 2 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.
ANZ280-311800-
OCEAN WATERS FROM THE MERRIMACK RIVER TO PLYMOUTH FROM 40 TO
60 NM-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...NW WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 2 TO 3 FT. WAVE DETAIL: SW 3 FT AT 5 SECONDS AND SE 1 FOOT
AT 8 SECONDS. MON... N WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT, BECOMING E
AROUND 5 KT IN THE AFTERNOON. SEAS 2 TO 3 FT. WAVE DETAIL: NW
2 FT AT 4 SECONDS AND SE 2 FT AT 8 SECONDS. MON NIGHT... S WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SW 1 FOOT AT 4 SECONDS AND SE 1 FOOT AT 7 SECONDS. TUE... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL: SE
2 FT AT 4 SECONDS AND SE 1 FOOT AT 8 SECONDS. A CHANCE OF
SHOWERS. PATCHY FOG IN THE MORNING. TUE NIGHT AND WED... SE WINDS AROUND 10 KT. SEAS 2 TO 3 FT. WAVE
DETAIL: SE 3 FT AT 9 SECONDS AND S 2 FT AT 4 SECONDS. WED NIGHT... SE WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS
3 TO 4 FT. WAVE DETAIL: SE 4 FT AT 7 SECONDS AND SE 1 FOOT AT
2 SECONDS. A CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS WITH
A CHANCE OF TSTMS AFTER MIDNIGHT. THU... S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 3 TO
4 FT. SHOWERS WITH A CHANCE OF TSTMS. THU NIGHT... NW WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. A CHANCE OF
SHOWERS. FRI AND FRI NIGHT... NW WINDS 10 TO 15 KT, BECOMING N 15 TO
20 KT. GUSTS UP TO 25 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.
ANZ281-311800-
OCEAN WATERS FROM PROVINCETOWN TO NANTUCKET FROM 20 TO 60 NM-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...W WINDS 10 TO 15 KT WITH GUSTS UP TO 25 KT.
SEAS 3 TO 4 FT. WAVE DETAIL: W 3 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. SHOWERS.MON... N WINDS AROUND 10 KT WITH GUSTS UP TO 20 KT, BECOMING NE
IN THE AFTERNOON. SEAS 2 TO 3 FT. WAVE DETAIL: W 3 FT AT
5 SECONDS AND SE 1 FOOT AT 8 SECONDS. MON NIGHT... SE WINDS AROUND 5 KT. SEAS AROUND 2 FT. WAVE DETAIL:
S 2 FT AT 6 SECONDS. TUE... SE WINDS 5 TO 10 KT, BECOMING E 10 TO 15 KT IN THE
AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: S 2 FT AT 4 SECONDS AND
SE 2 FT AT 8 SECONDS. A CHANCE OF SHOWERS. TUE NIGHT... E WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: S
3 FT AT 5 SECONDS. A CHANCE OF SHOWERS IN THE EVENING. WED... E WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 3 TO
4 FT. WAVE DETAIL: SE 4 FT AT 6 SECONDS. WED NIGHT... SE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT AFTER
MIDNIGHT. SEAS 3 TO 4 FT. A CHANCE OF SHOWERS AFTER MIDNIGHT. THU... S WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT. SEAS 3 TO
4 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS. THU NIGHT... W WINDS 5 TO 10 KT. SEAS 3 TO 4 FT. A CHANCE OF
SHOWERS. FRI AND FRI NIGHT... NW WINDS 10 TO 15 KT WITH GUSTS UP TO 25 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.
ANZ282-311800-
OCEAN WATERS FROM MARTHAS VINEYARD TO NANTUCKET FROM 25 TO 60 NM-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS AROUND 4 FT. WAVE DETAIL: W 4 FT AT 5 SECONDS AND SE 1 FOOT
AT 8 SECONDS. SHOWERS.MON... N WINDS AROUND 10 KT, BECOMING NE IN THE AFTERNOON. SEAS
2 TO 4 FT. WAVE DETAIL: W 3 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. MON NIGHT... SE WINDS AROUND 5 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SW 1 FOOT AT 4 SECONDS AND SE 1 FOOT AT 7 SECONDS. PATCHY FOG
AFTER MIDNIGHT. A CHANCE OF SHOWERS AFTER MIDNIGHT. TUE... E WINDS 10 TO 15 KT. SEAS 2 TO 3 FT. WAVE DETAIL: SE 3 FT
AT 7 SECONDS AND SW 1 FOOT AT 4 SECONDS. PATCHY FOG. A CHANCE OF
SHOWERS. TUE NIGHT... E WINDS 10 TO 15 KT. SEAS 2 TO 4 FT. WAVE DETAIL: SE
4 FT AT 7 SECONDS AND SW 1 FOOT AT 6 SECONDS. A CHANCE OF
SHOWERS. WED... E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT. WAVE DETAIL: S 4 FT
AT 6 SECONDS. WED NIGHT... SE WINDS AROUND 10 KT. SEAS AROUND 4 FT. A CHANCE OF
SHOWERS AFTER MIDNIGHT. THU AND THU NIGHT... SW WINDS AROUND 10 KT, BECOMING W. SEAS 3 TO
4 FT. A CHANCE OF SHOWERS. FRI... NW WINDS AROUND 10 KT. SEAS 3 TO 4 FT. A CHANCE OF
SHOWERS. FRI NIGHT... NW WINDS 10 TO 15 KT. SEAS 3 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.
ANZ283-311800-
OCEAN WATERS FROM MONTAUK NY TO MARTHAS VINEYARD FROM 25 TO 60 NM-
103 AM EDT MON AUG 31 2026
.REST OF TONIGHT...W WINDS 10 TO 15 KT WITH GUSTS UP TO 20 KT.
SEAS 3 TO 4 FT. WAVE DETAIL: W 4 FT AT 5 SECONDS AND SE 1 FOOT AT
8 SECONDS. SHOWERS WITH A SLIGHT CHANCE OF TSTMS. MON... N WINDS AROUND 10 KT, BECOMING E IN THE AFTERNOON. SEAS
2 TO 3 FT. WAVE DETAIL: W 3 FT AT 5 SECONDS AND E 2 FT AT
8 SECONDS. MON NIGHT... SE WINDS 5 TO 10 KT. SEAS AROUND 2 FT. WAVE DETAIL:
SE 2 FT AT 7 SECONDS AND SW 1 FOOT AT 4 SECONDS. PATCHY FOG AFTER
MIDNIGHT. A CHANCE OF SHOWERS AFTER MIDNIGHT. TUE... SE WINDS 5 TO 10 KT, INCREASING TO 10 TO 15 KT IN THE
AFTERNOON. SEAS AROUND 2 FT. WAVE DETAIL: S 2 FT AT 4 SECONDS AND
SE 2 FT AT 8 SECONDS. PATCHY FOG. A CHANCE OF SHOWERS. VSBY 1 TO
3 NM IN THE MORNING. TUE NIGHT... E WINDS AROUND 15 KT WITH GUSTS UP TO 20 KT. SEAS
2 TO 4 FT. WAVE DETAIL: E 3 FT AT 7 SECONDS AND SW 2 FT AT
4 SECONDS. A CHANCE OF SHOWERS. WED... E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING.
SEAS 3 TO 5 FT. WAVE DETAIL: E 5 FT AT 7 SECONDS AND S 1 FOOT AT
4 SECONDS. A CHANCE OF SHOWERS IN THE AFTERNOON. WED NIGHT... SE WINDS 10 TO 15 KT, BECOMING S AFTER MIDNIGHT.
SEAS 4 TO 5 FT. A CHANCE OF SHOWERS IN THE EVENING, THEN SHOWERS
LIKELY WITH A CHANCE OF TSTMS AFTER MIDNIGHT. THU... SW WINDS 10 TO 15 KT. SEAS 3 TO 4 FT. SHOWERS LIKELY WITH
A CHANCE OF TSTMS. THU NIGHT... W WINDS AROUND 10 KT. SEAS AROUND 3 FT. A CHANCE OF
SHOWERS. FRI AND FRI NIGHT... NW WINDS 10 TO 15 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
|
Wind, Wave
Pressure
Sea
Temperature
Buoy/CMAN
Reports
Radar and
Satellite
|
