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FZMY50 PGUM 121849
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
449 AM ChST Mon Oct 13 2025

Marianas Waters out to 40 nautical miles

PMZ150-130900-
449 AM ChST Mon Oct 13 2025

.Synopsis for Marianas Waters...
Combined seas of 4 to 6 feet today will edge up to between 5 and 7
feet around Tuesday night, mainly comprised of a long-period north
swell and trade swell. Winds will be gentle to moderate out of
the northeast to east for the next couple days, becoming moderate
to fresh around midweek as a tropical disturbance lifts northwest
through the area. This will bring seas up to 5 to 7 feet for the
latter half of the week, due to increasing wind waves and as
another pulse of north swell looks to move in. Seas and winds
could raise higher if the disturbance intensifies more rapidly
than expected.

$$

PMZ151>154-130900-
MARIANAS COASTAL WATERS-
449 AM ChST Mon Oct 13 2025

.TODAY...East wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: East
4 ft at 8 seconds, north 4 ft at 11 seconds and east 3 ft at
4 seconds. Scattered showers.
.TONIGHT...East wind 15 kt. Seas 4 to 6 ft. Wave Detail: East
4 ft at 8 seconds, north 4 ft at 11 seconds and east 3 ft at
5 seconds. Scattered showers with isolated thunderstorms.
.TUESDAY...East wind 10 to 15 kt with gusts to 25 kt. Seas 4 to
6 ft. Wave Detail: North 4 ft at 11 seconds, east 3 ft at
5 seconds and east 3 ft at 8 seconds. Scattered showers with
isolated thunderstorms.
.TUESDAY NIGHT...East wind 15 to 20 kt with gusts to 30 kt. Seas
5 to 7 ft. Wave Detail: East 4 ft at 6 seconds, east 4 ft at 9
seconds and north 4 ft at 13 seconds. Scattered showers with
isolated thunderstorms.
.WEDNESDAY...Southeast wind 15 to 20 kt with gusts to 30 kt. Seas
5 to 7 ft. Wave Detail: East 5 ft at 7 seconds and north 4 ft at
12 seconds. Numerous showers. A slight chance of thunderstorms.
.THURSDAY...Southeast wind 10 to 20 kt. Seas 5 to 7 ft. Wave
Detail: East 4 ft at 9 seconds, north 4 ft at 13 seconds and
southeast 3 ft at 5 seconds. A chance of showers with a slight
chance of thunderstorms.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, north 5 ft at 13 seconds and east 2 ft at
4 seconds. A slight chance of thunderstorms.

$$