481
FZUS51 KBOX 132306
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
705 PM EDT Mon May 13 2024

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

ANZ200-141200-
705 PM EDT Mon May 13 2024

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres over the N Atlc off the Mid Atlc coast will result in an
increasing S to SW wind tonight into Tue. A low pres should move E
from the Mid Atlc coast Wed night into Thu, shifting winds to the SE
to E across the waters. Depending on how close this low pres gets
Thu, there could be some gale force gusts across the southern outer
coastal waters. This low pres slowly moves farther out to sea through
Sat.

$$

ANZ250-141200-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
705 PM EDT Mon May 13 2024

.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
around 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 2 ft at
4 seconds. A chance of showers after midnight with vsby 1 to
3 NM.
.TUE...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 4 seconds and SE 2 ft at 7 seconds.
.TUE NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft
at 6 seconds and E 1 foot at 8 seconds. A chance of showers after
midnight with vsby 1 to 3 NM.
.WED...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 5 seconds and E 2 ft at 8 seconds. A chance of showers. Vsby
1 to 3 NM in the morning.
.WED NIGHT...SE winds around 10 kt, becoming E after midnight.
Seas 2 to 3 ft. Wave Detail: SE 2 ft at 3 seconds and E 2 ft at
9 seconds. A chance of showers.
.THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft. Wave Detail: SE 5 ft at 10 seconds and E 3 ft at
4 seconds. A chance of showers.
.FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to
5 ft.
.FRI NIGHT THROUGH SAT NIGHT...NE winds around 10 kt with gusts
up to 20 kt. Seas 3 to 5 ft. A chance of showers.

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.

$$

ANZ251-141200-
Massachusetts Bay and Ipswich Bay-
705 PM EDT Mon May 13 2024

.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt this evening.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and SE 2 ft at
4 seconds. A chance of showers after midnight.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 4 seconds and E 2 ft at 8 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds and E 1 foot at
8 seconds. A chance of showers after midnight.
.WED...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 5 seconds and E 1 foot at 8 seconds. A chance of showers.
Vsby 1 to 3 NM in the morning.
.WED NIGHT THROUGH THU NIGHT...NE winds 10 to 15 kt with gusts up
to 20 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 9 seconds and SE
3 ft at 4 seconds. A chance of showers.
.FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. Wave Detail: E 4 ft at 9 seconds and NE 2 ft at 5 seconds.
.FRI NIGHT THROUGH SAT NIGHT...NE winds around 10 kt with gusts
up to 20 kt. Seas 3 to 4 ft. A chance of showers.

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.

$$

ANZ231-141200-
Cape Cod Bay-
705 PM EDT Mon May 13 2024

.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 9 seconds and SE 1 foot at 3 seconds. A slight chance of
showers after midnight.
.TUE...S winds 10 to 15 kt, becoming SW 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas around 2 ft. Wave Detail: S
2 ft at 4 seconds and SE 1 foot at 7 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave
Detail: S 2 ft at 5 seconds and E 1 foot at 8 seconds. A chance
of showers after midnight with vsby 1 to 3 NM.
.WED...S winds 5 to 10 kt. Seas around 2 ft in the morning, then
1 foot or less. Wave Detail: S 1 foot at 3 seconds and E 1 foot
at 8 seconds, becoming SE 1 foot at 3 seconds and SE 1 foot at
7 seconds. A chance of showers.
.WED NIGHT THROUGH THU NIGHT...NE winds 10 to 15 kt with gusts up
to 25 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 9 seconds and S
3 ft at 10 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and N 2 ft at
4 seconds.
.SAT AND SAT NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. A
chance of showers.

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.

$$

ANZ254-141200-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
705 PM EDT Mon May 13 2024

.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 9 seconds and SW 2 ft at 3 seconds. Patchy fog. A slight
chance of showers after midnight. Vsby 1 to 3 NM.
.TUE...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E
2 ft at 8 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at
7 seconds. Patchy fog after midnight with vsby 1 to 3 NM.
.WED...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 4 seconds and E 2 ft at 8 seconds. A chance of showers in the
afternoon.
.WED NIGHT...SE winds 5 to 10 kt, becoming E 10 to 15 kt with
gusts up to 20 kt after midnight. Seas 2 to 4 ft, building to
4 to 6 ft after midnight. Wave Detail: SE 2 ft at 4 seconds and E
2 ft at 9 seconds, becoming S 4 ft at 10 seconds and SE 2 ft at
4 seconds. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt.
Seas 5 to 7 ft. Wave Detail: E 7 ft at 9 seconds and S 6 ft at
10 seconds. A chance of showers.
.FRI THROUGH SAT...E winds 10 to 15 kt with gusts up to 25 kt.
Seas 4 to 6 ft.
.SAT NIGHT...NE winds around 10 kt. Seas 4 to 5 ft. A chance of
showers.

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.

$$

ANZ255-141200-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt this evening.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at
7 seconds.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 6 seconds and E 2 ft at 8 seconds.
.TUE NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 4 ft. Wave Detail: S 3 ft at 6 seconds and SE
1 foot at 12 seconds.
.WED...S winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft
at 6 seconds and SE 1 foot at 12 seconds. A chance of showers.
Vsby 1 to 3 NM in the morning.
.WED NIGHT...E winds 15 to 20 kt, increasing to 20 to 25 kt after
midnight. Seas 3 to 5 ft, building to 5 to 7 ft after midnight.
Wave Detail: SE 3 ft at 6 seconds and E 1 foot at 8 seconds,
becoming S 6 ft at 10 seconds and SE 3 ft at 5 seconds. A chance
of showers.
.THU AND THU NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 5 to 8 ft. Wave Detail: SE 8 ft at 9 seconds and S 7 ft at
10 seconds. A chance of showers.
.FRI...NE winds around 15 kt with gusts up to 25 kt. Seas 4 to
6 ft.
.FRI NIGHT AND SAT...NE winds 10 to 15 kt. Gusts up to 20 kt.
Seas 3 to 5 ft.
.SAT NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. A chance of
showers.

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.

$$

ANZ256-141200-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt this evening.
Seas 3 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at
8 seconds.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 2 ft at 8 seconds.
.TUE NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 4 ft. Wave Detail: S 3 ft at 6 seconds and SE
1 foot at 12 seconds. A chance of showers after midnight with
vsby 1 to 3 NM.
.WED...SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 5 seconds and E 1 foot at 8 seconds. A chance of showers. Vsby
1 to 3 NM in the morning.
.WED NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft, building to 5 to 7 ft after midnight. Wave Detail: SE
3 ft at 5 seconds and S 3 ft at 7 seconds, becoming S 7 ft at
10 seconds and E 4 ft at 5 seconds. Showers likely, mainly in the
evening.
.THU AND THU NIGHT...NE winds 20 to 25 kt with gusts up to 35 kt.
Seas 5 to 8 ft. Wave Detail: SE 8 ft at 10 seconds and E 5 ft at
5 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt.
Seas 4 to 6 ft.
.SAT AND SAT NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. A
chance of showers.

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.

$$

ANZ232-141200-
Nantucket Sound-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 5 to 10 kt, increasing to 10 to 15 kt after
midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and
E 2 ft at 9 seconds.
.TUE...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 S 1 foot at 7 seconds.
.TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and E
1 foot at 8 seconds.
.WED...S winds around 10 kt. Seas around 2 ft. Wave Detail: SE
1 foot at 4 seconds and E 1 foot at 7 seconds. A chance of
showers. Vsby 1 to 3 NM in the morning.
.WED NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 4 ft. Wave Detail: E 2 ft at 3 seconds and SE
2 ft at 7 seconds. A chance of showers.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt.
Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and E 3 ft at
4 seconds. A chance of showers.
.FRI THROUGH SAT...E winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 4 ft.
.SAT NIGHT...NE winds around 10 kt. Seas around 2 ft. A chance of
showers.

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.

$$

ANZ233-141200-
Vineyard Sound-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt this evening.
Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and S 1 foot
at 7 seconds.
.TUE...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 S 1 foot at
7 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: S 2 ft at 6 seconds and SE 1 foot at 12 seconds. A chance
of showers after midnight with vsby 1 to 3 NM.
.WED...S winds 5 to 10 kt, becoming SE 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 5 seconds
and SE 1 foot at 12 seconds. A chance of showers. Vsby 1 to 3 NM
in the morning.
.WED NIGHT...E winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at 10 seconds and E
2 ft at 3 seconds. A chance of showers.
.THU...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: SE 5 ft at 9 seconds and NE 3 ft at 4 seconds.
A chance of showers.
.THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. A chance of showers in the evening.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft.
.SAT AND SAT NIGHT...NE winds around 10 kt. Seas around 2 ft. A
chance of showers.

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.

$$

ANZ234-141200-
Buzzards Bay-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt this evening.
Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and S 1 foot
at 7 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 25 kt. Seas around
2 ft. Wave Detail: SW 2 ft at 4 seconds and S 1 foot at
7 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt after midnight. Seas around 2 ft. Wave
Detail: S 2 ft at 6 seconds and SE 1 foot at 12 seconds. Patchy
fog after midnight. A chance of showers after midnight with vsby
1 to 3 NM.
.WED...S 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
E 1 foot at 8 seconds. A chance of showers. Patchy fog in the
morning with vsby 1 to 3 NM.
.WED NIGHT THROUGH THU NIGHT...NE winds 15 to 20 kt with gusts up
to 30 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and
NE 3 ft at 4 seconds. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and NE 2 ft at
3 seconds.
.SAT AND SAT NIGHT...NE winds around 10 kt. Seas around 2 ft. A
chance of showers.

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.

$$

ANZ235-141200-
Rhode Island Sound-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt this evening.
Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at
7 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 7 seconds and SE 1 foot at
13 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 6 seconds and SE 1 foot at 12 seconds. A chance
of showers after midnight with vsby 1 to 3 NM.
.WED...SE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers.
Vsby 1 to 3 NM in the morning.
.WED NIGHT...E winds 10 to 15 kt, becoming NE 15 to 20 kt after
midnight. Seas 2 to 4 ft, building to 4 to 6 ft after midnight.
Wave Detail: SE 2 ft at 5 seconds and SE 2 ft at 6 seconds,
becoming S 6 ft at 10 seconds and E 3 ft at 4 seconds. A chance
of showers.
.THU AND THU NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: SE 6 ft at 10 seconds and NE 4 ft at
4 seconds. A chance of showers.
.FRI...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft.
.FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft.
.SAT AND SAT NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. A
chance of showers.

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.

$$

ANZ237-141200-
Block Island Sound-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt this evening.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at
8 seconds.
.TUE...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 2 ft at 8 seconds.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave
Detail: S 3 ft at 6 seconds and SE 1 foot at 12 seconds. A chance
of showers after midnight with vsby 1 to 3 NM.
.WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft
at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in
the morning, then showers likely in the afternoon. Vsby 1 to 3 NM
in the morning.
.WED NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 4 ft, building to 4 to 6 ft after midnight.
Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 7 seconds,
becoming S 5 ft at 10 seconds and E 3 ft at 4 seconds. Showers
likely, mainly in the evening.
.THU AND THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: SE 6 ft at 10 seconds and E 3 ft at
4 seconds. A chance of showers.
.FRI...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
5 ft.
.FRI NIGHT...NE winds around 10 kt with gusts up to 20 kt. Seas
2 to 4 ft.
.SAT AND SAT NIGHT...E winds around 10 kt. Seas 2 to 3 ft. A
chance of showers.

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.

$$

ANZ230-141200-
Boston Harbor-
705 PM EDT Mon May 13 2024

.TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt this evening.
Waves around 2 ft. A chance of showers after midnight.
.TUE...S winds around 10 kt, increasing to around 15 kt with
gusts up to 20 kt in the afternoon. Waves around 2 ft.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves
around 2 ft. A chance of showers.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Waves around 2 ft in the morning, then 1 foot or less.
A chance of showers.
.WED NIGHT THROUGH THU NIGHT...NE winds 15 to 20 kt. Waves 2 to
3 ft. A chance of showers.
.FRI...NE winds around 10 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.FRI NIGHT THROUGH SAT NIGHT...NE winds around 10 kt. Waves 2 to
3 ft. A chance of showers.

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.

$$

ANZ236-141200-
Narragansett Bay-
705 PM EDT Mon May 13 2024

.TONIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt this evening.
Waves around 2 ft.
.TUE...S winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt after midnight. Waves around 2 ft. Patchy
fog after midnight. A chance of showers after midnight with vsby
1 to 3 NM.
.WED...S winds 5 to 10 kt, becoming SE 10 to 15 kt in the
afternoon. Waves 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM
in the morning.
.WED NIGHT THROUGH THU NIGHT...NE winds 15 to 20 kt with gusts up
to 30 kt. Waves 2 to 3 ft. A chance of showers.
.FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt. Waves 2 to 3 ft.
.SAT AND SAT NIGHT...NE winds 5 to 10 kt. Waves 2 to 3 ft. A
chance of showers.

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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