649
FZMY50 PGUM 120705
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
505 PM ChST Sun Oct 12 2025

Marianas Waters out to 40 nautical miles

PMZ150-122030-
505 PM ChST Sun Oct 12 2025

.Synopsis for Marianas Waters...
Combined seas will remain at around 4 to 6 feet for the next few
days, 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.

$$

PMZ151>154-122030-
MARIANAS COASTAL WATERS-
505 PM ChST Sun Oct 12 2025

.TONIGHT...East wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail:
North 4 ft at 12 seconds, east 3 ft at 8 seconds and east 3 ft at
4 seconds. Scattered showers after midnight.
.MONDAY...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.
.MONDAY NIGHT...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. 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 gusting to 30 kt near
heavier showers. Seas 5 to 7 ft. Wave Detail: East 5 ft at 6
seconds, southeast 4 ft at 8 seconds and north 4 ft at 12 seconds.
Numerous locally heavy showers with 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 4 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 3 ft at
4 seconds. A slight chance of thunderstorms.

$$