269 

FZUS51 KBOX 160502
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
102 AM EDT Thu Apr 16 2026

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

ANZ200-161800-
102 AM EDT Thu Apr 16 2026

.Synopsis for Massachusetts and Rhode Island coastal waters...
A backdoor cold front remains over northern New England
today, which may flirt with MA waters north of Cape Cod through Thu.
A cold front likely crosses waters sometime Fri/Fri night followed
by a stronger cold front sometime Sun/Sun night. Early next week,
high pres builds from the Great Lakes to the Mid Atlantic.

$$

ANZ250-161800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SE winds around 5 kt. Seas around 2 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...SE winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A
chance of showers in the morning with vsby 1 NM or less.
.THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
around 2 ft. A chance of showers.
.FRI...W winds 5 to 10 kt, becoming NE in the afternoon. Seas
around 2 ft. A chance of showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to
20 kt. Gusts up to 25 kt. Seas 2 to 4 ft. Showers likely.
.MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 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.

$$

ANZ251-161800-
Massachusetts Bay and Ipswich Bay-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...E winds around 5 kt. Seas 1 foot or less.
Patchy fog. A chance of showers with a slight chance of tstms.
Vsby 1 NM or less.
.THU...E winds 5 to 10 kt. Seas 1 foot or less. Patchy fog in the
morning with vsby 1 NM or less.
.THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Seas around 2 ft. Patchy fog. A chance of showers.
.FRI...NW winds 5 to 10 kt, becoming NE in the afternoon. Seas
around 2 ft. A chance of showers.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers in the evening.
.SAT...NE winds 5 to 10 kt. Seas around 2 ft.
.SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers after midnight.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to
20 kt. Seas 2 to 3 ft. Showers likely.
.MON AND MON NIGHT...NW winds 15 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.

$$

ANZ231-161800-
Cape Cod Bay-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds around 5 kt. Seas 1 foot or less.
Patchy fog. A chance of showers with a slight chance of tstms.
Vsby 1 NM or less.
.THU...SW winds 5 to 10 kt. Seas 1 foot or less. Patchy fog in
the morning with vsby 1 NM or less.
.THU NIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. Seas around 2 ft. Patchy fog after midnight.
.FRI...W winds 5 to 10 kt, becoming N in the afternoon. Seas
1 foot or less. Patchy fog in the morning. A chance of showers in
the afternoon. Vsby 1 to 3 NM in the morning.
.FRI NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. A chance
of showers in the evening.
.SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to
20 kt. Seas 2 to 3 ft. Showers likely.
.MON AND MON NIGHT...NW winds 15 to 20 kt, diminishing 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.

$$

ANZ254-161800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby
1 NM or less.
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Patchy fog after midnight with vsby 1 NM or less.
.FRI...SW winds 5 to 10 kt, becoming NW in the afternoon. Seas
2 to 4 ft. Patchy fog in the morning. A chance of showers in the
afternoon. Vsby 1 NM or less in the morning.
.FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 3 ft.
.SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft.
.SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Showers likely.
.SUN NIGHT...W winds 20 to 25 kt. Seas 3 to 5 ft. A chance of
showers.
.MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 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.

$$

ANZ255-161800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 3 ft. Patchy
fog. A slight chance of showers and tstms. Vsby 1 NM or less.
.THU...SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog in the
morning with vsby 1 NM or less.
.THU NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Seas 3 to 4 ft. Patchy fog after midnight with
vsby 1 NM or less.
.FRI...SW winds 10 to 15 kt, becoming W 5 to 10 kt in the
afternoon. Seas 3 to 4 ft. Patchy fog in the morning with vsby
1 NM or less.
.FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 4 ft.
.SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas
2 to 3 ft.
.SUN...SW winds 15 to 20 kt. Seas 2 to 4 ft. A chance of showers.
.SUN NIGHT...W winds 20 to 25 kt. Seas 5 to 7 ft. A chance of
showers.
.MON...W winds 20 to 25 kt. Seas 5 to 7 ft.
.MON NIGHT...NW winds 20 to 25 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.

$$

ANZ256-161800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt with gusts up to 20 kt.
Seas 3 to 4 ft. Patchy fog. A slight chance of showers and tstms.
Vsby 1 NM or less.
.THU...SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog in the
morning with vsby 1 NM or less.
.THU NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Seas 3 to 4 ft. Patchy fog after midnight with
vsby 1 NM or less.
.FRI...SW winds 10 to 15 kt, becoming W 5 to 10 kt in the
afternoon. Seas 3 to 4 ft. Patchy fog in the morning. A chance of
showers in the afternoon. Vsby 1 NM or less in the morning.
.FRI NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft.
.SUN...SW winds 15 to 20 kt. Seas 2 to 4 ft. Showers likely.
.SUN NIGHT...W winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely.
.MON...W winds 20 to 25 kt. Seas 4 to 6 ft.
.MON NIGHT...NW winds 20 to 25 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.

$$

ANZ232-161800-
Nantucket Sound-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog in the
morning with vsby 1 to 3 NM.
.THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Patchy fog
after midnight with vsby 1 to 3 NM.
.FRI...SW winds 5 to 10 kt, becoming NW in the afternoon. Seas
around 2 ft. Patchy fog in the morning. A chance of showers in
the afternoon. Vsby 1 NM or less in the morning.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft.
.SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Showers likely.
.SUN NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. A chance of showers.
.MON AND MON NIGHT...NW winds 15 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.

$$

ANZ233-161800-
Vineyard Sound-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby
1 NM or less.
.THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Patchy fog
after midnight with vsby 1 to 3 NM.
.FRI...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog in the
morning. A chance of showers in the afternoon. Vsby 1 NM or less
in the morning.
.FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to
20 kt. Gusts up to 25 kt. Seas 2 to 4 ft. Showers likely.
.MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 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.

$$

ANZ234-161800-
Buzzards Bay-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...S winds around 5 kt. Seas around 2 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog in the
morning with vsby 1 NM or less.
.THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft.
.FRI...SW winds 5 to 10 kt, becoming W in the afternoon. Seas
around 2 ft. Patchy fog in the morning. A chance of showers in
the afternoon.
.FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to
20 kt. Seas 2 to 3 ft. Showers likely.
.MON AND MON NIGHT...W winds 15 to 20 kt, becoming NW 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.

$$

ANZ235-161800-
Rhode Island Sound-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby
1 NM or less.
.THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 3 ft. Patchy fog after midnight with vsby
1 to 3 NM.
.FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog in the
morning. A chance of showers in the afternoon. Vsby 1 NM or less
in the morning.
.FRI NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...SE winds around 10 kt. Seas 2 to 3 ft.
.SUN AND SUN NIGHT...SW winds 15 to 20 kt, becoming W 20 to
25 kt. Seas 2 to 4 ft. Showers likely.
.MON AND MON NIGHT...W winds 20 to 25 kt, becoming NW 15 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.

$$

ANZ237-161800-
Block Island Sound-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy
fog. A slight chance of showers and tstms. Vsby 1 NM or less.
.THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby
1 NM or less.
.THU NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Seas 2 to 3 ft. Patchy fog after midnight with
vsby 1 NM or less.
.FRI...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog in the
morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in
the morning.
.FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Showers likely.
.SUN NIGHT...W winds 15 to 20 kt. Seas 2 to 4 ft. Showers likely
with a chance of snow showers.
.MON AND MON NIGHT...NW winds 15 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.

$$

ANZ230-161800-
Boston Harbor-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...E winds around 5 kt. Waves 1 foot or less.
Patchy fog. Showers likely with a chance of tstms. Vsby 1 NM or
less.
.THU...E winds 5 to 10 kt. Waves 1 foot or less. A chance of
showers. Patchy fog in the morning with vsby 1 NM or less.
.THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Waves 1 foot or less. Patchy fog. A chance of showers.
.FRI...NW winds 5 to 10 kt, becoming NE in the afternoon. Waves
1 foot or less. A chance of showers.
.FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. A chance
of showers in the evening.
.SAT...NE winds 5 to 10 kt. Waves 1 foot or less.
.SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight.
Waves 1 foot or less. A chance of showers after midnight.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to
20 kt. Waves around 2 ft. Showers likely.
.MON AND MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to
15 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.

$$

ANZ236-161800-
Narragansett Bay-
102 AM EDT Thu Apr 16 2026

.REST OF TONIGHT...S winds around 5 kt. Waves around 2 ft. Patchy
fog. A chance of showers with a slight chance of tstms. Vsby 1 NM
or less.
.THU...S winds 5 to 10 kt. Waves around 2 ft. Patchy fog in the
morning with vsby 1 NM or less.
.THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.FRI...W winds 5 to 10 kt. Waves around 2 ft. A chance of showers
in the afternoon.
.FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. A chance of
showers in the evening.
.SAT AND SAT NIGHT...SE winds 5 to 10 kt. Waves around 2 ft.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W. Gusts up
to 20 kt. Waves around 2 ft. Showers likely.
.MON AND MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 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.

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

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You can follow us on Twitter at
@NWSBoston






016 

FZUS56 KEKA 160508
CWFEKA

Coastal Waters Forecast for Northwest California
National Weather Service Eureka CA
1008 PM PDT Wed Apr 15 2026

WATERS FROM PT ST GEORGE TO PT ARENA AND OUT 60 NM

PZZ400-161800-
1008 PM PDT Wed Apr 15 2026

.SYNOPSIS FOR NORTHERN CALIFORNIA WATERS...Gale force northerlies
and very steep seas are expected Thursday through Thursday night.
Elevated northerlies and steep waves on Friday are forecast to
diminish by Saturday. Moderate southerly breezes are expected
Saturday night and Sunday in advance of a frontal system.

$$

PZZ450-161800-
Pt St George to Cape Mendocino out 10 nm-
1008 PM PDT Wed Apr 15 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE THURSDAY NIGHT...

.REST OF TONIGHT...N wind 15 to 20 kt. Seas 8 ft. Wave
Detail: NW 8 ft at 10 seconds.
.THU...N wind 20 to 25 kt. Seas 9 ft. Wave Detail: NW 9
ft at 11 seconds.
.THU NIGHT...N wind 20 to 25 kt. Seas 10 ft. Wave Detail:
NW 10 ft at 10 seconds.
.FRI...N wind 5 to 10 kt. Seas 6 ft. Wave Detail: NW 6 ft
at 10 seconds.
.FRI NIGHT...N wind 5 to 10 kt. Seas 5 ft. Wave Detail: NW
5 ft at 9 seconds and SW 1 foot at 14 seconds.
.SAT...W wind 5 kt. Seas 3 ft. Wave Detail: NW 3 ft
at 9 seconds and SW 1 foot at 14 seconds.
.SAT NIGHT...S wind 5 to 10 kt. Seas 3 ft. Wave Detail: W
3 ft at 8 seconds and SW 1 foot at 14 seconds. A chance of rain.
.SUN...S wind 10 to 15 kt. Seas 4 ft. Wave Detail: SW 4 ft
at 8 seconds and SW 1 foot at 14 seconds. Rain likely.
.SUN NIGHT...S wind 5 to 10 kt. Seas 5 ft. Wave Detail: W
5 ft at 10 seconds and SW 2 ft at 14 seconds. Rain.
.MON...S wind 5 to 10 kt. Seas 7 ft. Wave Detail: W 7 ft
at 13 seconds. Rain likely.
.MON NIGHT...SE wind 5 to 10 kt. Seas 6 ft. Wave Detail: W
6 ft at 11 seconds. Rain likely.

$$

PZZ470-161800-
Pt St George to Cape Mendocino 10 to 60 nm-
1008 PM PDT Wed Apr 15 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...
...GALE WARNING IN EFFECT FROM THURSDAY AFTERNOON THROUGH LATE
THURSDAY NIGHT...

.REST OF TONIGHT...N wind 15 to 20 kt. Seas 9 ft. Wave
Detail: NW 9 ft at 9 seconds and S 2 ft at 15 seconds.
.THU...N wind 20 to 25 kt with gusts to 35 kt. Seas 10 ft.
Wave Detail: NW 9 ft at 11 seconds and S 2 ft at 15 seconds.
.THU NIGHT...N wind 25 to 30 kt with gusts to 35 kt. Seas 11 ft.
Wave Detail: NW 11 ft at 10 seconds and S 2 ft at 15 seconds.
.FRI...N wind 15 to 20 kt. Seas 8 ft. Wave Detail: N 8 ft
at 9 seconds and S 2 ft at 15 seconds.
.FRI NIGHT...N wind 10 to 15 kt. Seas 6 ft. Wave Detail:
NW 6 ft at 9 seconds and S 2 ft at 16 seconds.
.SAT...W wind 5 to 10 kt. Seas 4 ft. Wave Detail: NW 4 ft
at 8 seconds and S 2 ft at 16 seconds.
.SAT NIGHT...S wind 10 to 15 kt. Seas 4 ft. Wave Detail: W
4 ft at 8 seconds and S 2 ft at 15 seconds. Rain likely.
.SUN...S wind 10 to 15 kt. Seas 5 ft. Wave Detail: SW 5 ft
at 8 seconds and S 2 ft at 15 seconds. Rain.
.SUN NIGHT...SE wind 10 kt. Seas 6 ft. Wave Detail:
W 6 ft at 11 seconds and S 2 ft at 14 seconds. Rain.
.MON...S wind 10 to 15 kt. Seas 9 ft. Wave Detail: SW 9 ft
at 13 seconds and S 2 ft at 14 seconds. Rain.
.MON NIGHT...S wind 10 kt. Seas 7 ft. Wave Detail:
S 7 ft at 12 seconds. Rain likely.

$$

PZZ455-161800-
Cape Mendocino to Pt Arena out 10 nm-
1008 PM PDT Wed Apr 15 2026

...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON...
...GALE WARNING IN EFFECT FROM THURSDAY AFTERNOON THROUGH LATE
THURSDAY NIGHT...

.REST OF TONIGHT...N wind 20 to 25 kt. Seas 9 ft.
Wave Detail: NW 9 ft at 10 seconds and S 2 ft at 15 seconds.
.THU...N wind 20 to 25 kt with gusts up to 35 kt. Seas
9 ft. Wave Detail: NW 9 ft at 9 seconds and S 2 ft at 15 seconds.
.THU NIGHT...N wind 20 to 25 kt with gusts up to 35 kt. Seas
around 9 ft. Wave Detail: NW 9 ft at 10 seconds.
.FRI...N wind 10 to 15 kt. Seas 6 ft. Wave Detail: NW 6 ft
at 10 seconds and S 2 ft at 15 seconds.
.FRI NIGHT...N wind 10 to 15 kt. Seas 5 ft. Wave Detail:
NW 5 ft at 9 seconds and S 2 ft at 15 seconds.
.SAT...NW wind 5 to 10 kt. Seas 4 ft. Wave Detail: NW 4 ft
at 9 seconds and S 2 ft at 16 seconds.
.SAT NIGHT...S wind 5 to 10 kt. Seas 3 ft. Wave Detail: NW
3 ft at 8 seconds and S 2 ft at 15 seconds. A chance of rain.
.SUN...S wind 10 to 15 kt. Seas 3 ft. Wave Detail: SW 3 ft
at 8 seconds and S 2 ft at 15 seconds. Rain likely.
.SUN NIGHT...SE wind 5 to 10 kt. Seas 5 ft. Wave Detail:
SW 5 ft at 8 seconds and SW 2 ft at 14 seconds. Rain.
.MON...S wind 5 to 10 kt. Seas 7 ft. Wave Detail: W 7 ft
at 11 seconds and S 2 ft at 14 seconds. Rain.
.MON NIGHT...SE wind 5 to 10 kt. Seas 7 ft. Wave Detail: W
7 ft at 11 seconds. Rain likely.

$$

PZZ475-161800-
Cape Mendocino to Pt Arena 10 to 60 nm-
1008 PM PDT Wed Apr 15 2026

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 5 AM PDT THURSDAY...
...GALE WARNING IN EFFECT FROM 5 AM PDT THURSDAY THROUGH LATE
THURSDAY NIGHT...

.REST OF TONIGHT...N wind 20 to 25 kt. Seas 9 ft. Wave
Detail: NW 9 ft at 10 seconds and S 2 ft at 15 seconds.
.THU...N wind 25 to 30 kt with gusts up to 40 kt. Seas
10 ft. Wave Detail: NW 10 ft at 10 seconds and S 2 ft at
15 seconds.
.THU NIGHT...N wind 25 to 30 kt with gusts up to 40 kt. Seas
around 12 ft. Wave Detail: N 12 ft at 10 seconds.
.FRI...N wind 15 to 20 kt. Seas 9 ft. Wave Detail: N 9 ft
at 9 seconds and S 2 ft at 16 seconds.
.FRI NIGHT...N wind 15 to 20 kt. Seas 7 ft. Wave Detail:
NW 7 ft at 9 seconds and S 2 ft at 16 seconds.
.SAT...NW wind 5 to 10 kt. Seas 5 ft. Wave Detail: NW 5 ft
at 9 seconds and S 2 ft at 17 seconds.
.SAT NIGHT...S wind 10 to 15 kt. Seas 4 ft. Wave Detail:
NW 3 ft at 8 seconds and S 2 ft at 15 seconds. A chance of rain.
.SUN...S wind 10 to 15 kt. Seas 5 ft. Wave Detail: SW 5 ft
at 8 seconds and S 2 ft at 15 seconds. Rain likely.
.SUN NIGHT...S wind 10 to 15 kt. Seas 6 ft. Wave Detail:
SW 6 ft at 10 seconds and S 2 ft at 14 seconds. Rain.
.MON...S wind 10 to 15 kt. Seas 9 ft. Wave Detail: SW 9 ft
at 12 seconds and S 2 ft at 14 seconds. Rain likely.
.MON NIGHT...SE wind 10 to 15 kt. Seas 7 ft. Wave Detail:
S 7 ft at 12 seconds. Rain likely.

$$






255 

FZMY50 PGUM 160556
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
356 PM ChST Thu Apr 16 2026

Marianas Waters out to 40 nautical miles

PMZ150-161415-
356 PM ChST Thu Apr 16 2026

.Synopsis for Marianas Waters...
Typhoon Sinlaku continues to move slowly north through the
northern CNMI. Due to the large wind field around the system,
life threatening marine conditions will persist through at least
tonight for Guam and Rota; and through at least Friday night for
Tinian and Saipan. In addition to winds, Sinlaku will produce
heavy showers and isolated thunderstorms through tonight,
especially for northern waters of Tinian and Saipan. Combined seas
are expected to be around 12 to 18 ft for Guam, 16 to 22 feet for
Rota, and 20 to 26 feet for Tinian and Saipan through tonight as
Sinlaku moves through the northern CNMI.

$$

PMZ151-161415-
Guam Coastal Waters-
356 PM ChST Thu Apr 16 2026

...HAZARDOUS SEAS WARNING IN EFFECT UNTIL 5 PM CHST FRIDAY...
...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY AFTERNOON...

.TONIGHT...Southwest wind 30 kt, easing to 20 to 25 kt. Gusts up
to 40 kt this evening. Seas 12 to 18 ft.
.FRIDAY...Southwest wind 15 to 25 kt with gusts to 30 kt. Seas
12 to 17 ft.
.FRIDAY NIGHT...West wind 15 to 20 kt with gusts to 25 kt. Seas
11 to 14 ft.
.SATURDAY...West wind 10 to 15 kt. Seas 8 to 11 ft. Wave Detail:
Northwest 11 ft at 10 seconds and west 3 ft at 4 seconds.
.SATURDAY NIGHT...West wind 5 to 10 kt. Seas 6 to 9 ft. Wave
Detail: North 9 ft at 10 seconds and west 2 ft at 4 seconds.
.SUNDAY AND MONDAY...Northeast wind 5 kt. Seas 5 to 8 ft.
Wave Detail: North 8 ft at 10 seconds.
.TUESDAY...Northeast wind 5 to 10 kt. Seas 4 to 7 ft. Wave
Detail: Northeast 7 ft at 10 seconds and northeast 2 ft at
4 seconds.

$$

PMZ152-161415-
Rota Coastal Waters-
356 PM ChST Thu Apr 16 2026

...TYPHOON WARNING IN EFFECT...

.TONIGHT...Southwest tropical storm force wind to 40 kt with
gusts to 50 kt, subsiding to 20 to 30 kt with gusts to 40 kt
during the evening. Seas 16 to 22 ft. Scattered showers early.
.FRIDAY...Southwest wind 20 to 30 kt with gusts to 40 kt. Seas 14
to 18 ft.
.FRIDAY NIGHT...West wind 15 to 20 kt. Seas 12 to 16 ft.
.SATURDAY...West wind 10 to 15 kt. Seas 9 to 13 ft.
.SATURDAY NIGHT...West wind 10 kt. Seas 8 to 11 ft. Wave Detail:
North 11 ft at 11 seconds and west 2 ft at 4 seconds.
.SUNDAY...West wind 10 kt. Seas 7 to 10 ft. Wave Detail: North
10 ft at 10 seconds and west 2 ft at 4 seconds.
.MONDAY...Northeast wind 5 kt. Seas 6 to 9 ft. Wave Detail: North
9 ft at 11 seconds.
.TUESDAY...Northeast wind 5 to 10 kt. Seas 5 to 7 ft. Wave
Detail: North 7 ft at 10 seconds and northeast 2 ft at 4 seconds.

$$

PMZ153-154-161415-
Tinian Coastal Waters-Saipan Coastal Waters-
356 PM ChST Thu Apr 16 2026

...TYPHOON WARNING IN EFFECT...

.TONIGHT...Southwest tropical storm force wind to 50 kt. Gusts up
to 65 kt, decreasing to 40 kt with gusts to 50 kt by midnight.
Seas 21 to 26 ft. Numerous locally heavy showers with isolated
thunderstorms early, then scattered showers.
.FRIDAY...Southwest tropical storm force wind to 40 kt with gusts
to 50 kt, decreasing to 25 to 30 kt with gusts to 40 kt during
the morning. Seas 19 to 25 ft. Scattered showers.
.FRIDAY NIGHT...West wind 15 to 25 kt with gusts to 35 kt. Seas
11 to 15 ft.
.SATURDAY...West wind 15 to 25 kt. Seas 9 to 13 ft.
.SATURDAY NIGHT...West wind 10 to 20 kt. Seas 8 to 12 ft.
.SUNDAY...West wind 10 kt. Seas 6 to 10 ft. Wave Detail: North
12 ft at 11 seconds and west 2 ft at 4 seconds.
.MONDAY...Northeast wind 5 kt. Seas 6 to 9 ft. Wave Detail: North
9 ft at 11 seconds.
.TUESDAY...Northeast wind 5 to 10 kt. Seas 5 to 8 ft. Wave
Detail: North 8 ft at 10 seconds and northeast 2 ft at 4 seconds.

$$