506
FZUS51 KBOX 111404
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 AM EDT Mon Aug 11 2025

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

ANZ200-120300-
1004 AM EDT Mon Aug 11 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High Pressure is continuing to bring pleasant boating conditions
through midweek. Winds gradually increase form the SW Tue and Wed but
remain below small craft criteria.

$$

ANZ250-120300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: E 3 ft at 9 seconds and SW 1 foot at 3 seconds.
.TONIGHT...SW winds around 10 kt. Seas 3 to 4 ft. Wave Detail: E
3 ft at 9 seconds and S 2 ft at 3 seconds.
.TUE...SW winds 5 to 10 kt, becoming S 10 to 15 kt in the
afternoon. Seas around 3 ft. Wave Detail: E 3 ft at 9 seconds and
SW 2 ft at 3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 3 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at
4 seconds.
.WED...SW 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 2 ft at 8 seconds.
.WED NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail:
SW 3 ft at 4 seconds and E 2 ft at 8 seconds. A chance of
showers.
.THU AND THU NIGHT...SW winds 10 to 15 kt, becoming NW. Gusts up
to 20 kt. Seas 2 to 3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming S. 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.

$$

ANZ251-120300-
Massachusetts Bay and Ipswich Bay-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 9 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds and S 2 ft at 3 seconds.
.TUE...SW winds 5 to 10 kt, becoming S 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and
SW 1 foot at 3 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S
2 ft at 4 seconds.
.WED...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at
7 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds around 10 kt, becoming NW. Seas
around 2 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt, becoming S 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.

$$

ANZ231-120300-
Cape Cod Bay-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 9 seconds and SW 1 foot at 2 seconds.
.TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 9 seconds and SW 1 foot at 2 seconds.
.TUE...SW 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: E
2 ft at 9 seconds and SW 1 foot at 2 seconds.
.TUE NIGHT...SW winds 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
3 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
7 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds around 10 kt, becoming NW. Seas
around 2 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming SE 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.

$$

ANZ254-120300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: E 4 ft at 9 seconds and SW 1 foot at 3 seconds.
.TONIGHT...SW winds around 10 kt. Seas 3 to 4 ft. Wave Detail: E
4 ft at 9 seconds and SW 2 ft at 3 seconds.
.TUE...SW winds around 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds and SW 2 ft at 4 seconds. Patchy dense fog in the
morning with vsby 1 NM or less.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 2 ft at
4 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
around 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at
8 seconds. A chance of showers after midnight.
.THU AND THU NIGHT...SW winds 10 to 15 kt, becoming W. Gusts up
to 20 kt. Seas 2 to 3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E 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.

$$

ANZ255-120300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds around 10 kt. Seas 2 to 4 ft. Wave
Detail: E 3 ft at 9 seconds and SW 2 ft at 4 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
3 ft at 9 seconds and SW 2 ft at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.TUE...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds and W 2 ft at 4 seconds. Patchy fog in the morning
with vsby 1 NM or less.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds and SW 2 ft at 4 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at
8 seconds. A chance of showers after midnight.
.THU AND THU NIGHT...SW winds 10 to 15 kt, becoming W. Seas 2 to
3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE 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.

$$

ANZ256-120300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds around 10 kt. Gusts up to 20 kt. Seas
2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and SW 2 ft at
3 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
3 ft at 9 seconds and SW 2 ft at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.TUE...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds and SW 2 ft at 4 seconds. Patchy fog. Vsby 1 NM or
less, increasing to 1 to 3 NM in the afternoon.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
3 ft at 9 seconds and SW 2 ft at 4 seconds. Patchy fog in the
evening with vsby 1 NM or less.
.WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas around 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at
8 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds 10 to 15 kt, becoming NW. Seas 2 to
3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E. 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.

$$

ANZ232-120300-
Nantucket Sound-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 3 seconds and E 2 ft at 9 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 3 seconds and E 2 ft at 9 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at
9 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
9 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
8 seconds.
.WED NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at
8 seconds. A chance of showers after midnight.
.THU AND THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming W. Seas around 2 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E. 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.

$$

ANZ233-120300-
Vineyard Sound-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 3 seconds and SE 1 foot at 8 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 4 seconds and SE 1 foot at 9 seconds.
.TUE...SW winds around 10 kt, increasing to around 15 kt with
gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 foot at 9 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
8 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW. Seas around 2 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E. 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.

$$

ANZ234-120300-
Buzzards Bay-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas
1 foot or less, then around 2 ft. Wave Detail: SW 1 foot at
3 seconds and SE 1 foot at 8 seconds, becoming SW 2 ft at
3 seconds and SE 1 foot at 9 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 4 seconds and SE 1 foot at 9 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot
at 9 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 foot at 9 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
8 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming NW. Seas around 2 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E 5 to 10 kt. Seas around 2 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ235-120300-
Rhode Island Sound-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 4 seconds and SE 2 ft at 9 seconds.
.TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at
9 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE
2 ft at 9 seconds. Patchy fog in the evening with vsby 1 to 3 NM.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
8 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds 10 to 15 kt, becoming NW. Seas 2 to
3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E. Seas around 2 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ237-120300-
Block Island Sound-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at
8 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 4 seconds and SE 2 ft at 9 seconds.
.TUE...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 3 seconds and SE 2 ft at 9 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SW 2 ft at 3 seconds and E 2 ft at 9 seconds. Patchy fog in the
evening with vsby 1 to 3 NM.
.WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at
8 seconds.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E
1 foot at 8 seconds. A chance of showers.
.THU AND THU NIGHT...SW winds around 10 kt, becoming NW. Seas
2 to 3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming E 5 to 10 kt. Seas around 2 ft.

Seas are reported as significant wave height, which is the
average of the highest third of the waves. Individual wave
heights may be more than twice the significant wave height.

$$

ANZ230-120300-
Boston Harbor-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less.
.TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.TUE...SW winds 5 to 10 kt, becoming S in the afternoon. Waves
1 foot or less.
.TUE NIGHT...SW winds around 10 kt. Waves around 2 ft in the
evening, then 1 foot or less.
.WED...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 1 foot or less, then around 2 ft
in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft. A chance of showers.
.THU AND THU NIGHT...SW winds 5 to 10 kt, becoming NW. Waves
around 2 ft, then 1 foot or less. A chance of showers.
.FRI AND FRI NIGHT...NE winds around 10 kt, becoming S. Waves
around 2 ft, then 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.

$$

ANZ236-120300-
Narragansett Bay-
1004 AM EDT Mon Aug 11 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Waves around 2 ft.
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.TUE...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Waves around 2 ft.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft.
.WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Waves around 2 ft. A
chance of showers.
.THU...SW winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.THU NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. A chance of
showers.
.FRI AND FRI NIGHT...NE winds around 10 kt, becoming E. 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.

$$

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