544
FZMY50 PGUM 301811
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
411 AM ChST Mon Mar 31 2025

Marianas Waters out to 40 nautical miles

PMZ150-311200-
411 AM ChST Mon Mar 31 2025

.Synopsis for Marianas Waters...
Extended the Small Craft Advisory for the coastal waters through
this afternoon as the surge in trade winds with strong to near-
gale expected. Nearby buoys and altimetry are showing seas of 6
to 8 feet, which are expected to continue through Tuesday, after
which seas drop down to 5 to 7 feet, then another pulse of
northeast swell increases seas again late week. Winds will
generally be fresh over the next few days, decreasing to moderate
to fresh in the latter half of the week.

$$

PMZ151>154-311200-
MARIANAS COASTAL WATERS-
411 AM ChST Mon Mar 31 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH UNTIL 5PM CHST THIS
AFTERNOON...

.TODAY...East wind 20 kt with frequent gusts to 30 kt. Seas 6 to
8 ft. Wave Detail: East 6 ft at 8 seconds, east 5 ft at 7 seconds
and northeast 2 ft at 12 seconds. Scattered showers Guam and Rota
waters in the morning.
.TONIGHT AND TUESDAY...East wind 15 to 20 kt. Seas 6 to 8 ft.
Wave Detail: East 6 ft at 8 seconds, east 4 ft at 6 seconds and
northeast 3 ft at 12 seconds.
.TUESDAY NIGHT...East wind 15 to 20 kt. Seas 5 to 7 ft. Wave
Detail: East 5 ft at 8 seconds, east 3 ft at 5 seconds and
northeast 3 ft at 11 seconds.
.WEDNESDAY THROUGH THURSDAY...East wind 10 to 15 kt. Seas 5 to
7 ft. Wave Detail: East 6 ft at 8 seconds, northeast 4 ft at
14 seconds and east 3 ft at 5 seconds.
.FRIDAY...East wind 10 kt. Seas 6 to 8 ft. Wave Detail: East 6 ft
at 8 seconds, northeast 5 ft at 14 seconds and east 2 ft at 4
seconds.

$$