914
FZMY50 PGUM 191817
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
417 AM ChST Sun Jul 20 2025

Marianas Waters out to 40 nautical miles

PMZ150-201000-
417 AM ChST Sun Jul 20 2025

.Synopsis for Marianas Waters...Light to moderate trade winds
will continue across the region over the next several days.
Occasional gusts to 25 kt remain possible near heavier showers
through this afternoon. Combined seas of 3 to 5 feet are expected
over the next few days, increasing to 4 to 6 feet in the latter
half of the week, but could potentially be higher depending on the
development of west-southwest swell. Convergence in the trade-
wind pattern and the TUTT to the west will maintain an unsettled
pattern through tonight. Isolated to scattered showers are
expected Monday and Tuesday, then a possible disturbance may
increase showers once again in the latter half of the week.

$$

PMZ151>154-201000-
MARIANAS COASTAL WATERS-
417 AM ChST Sun Jul 20 2025

.TODAY...East wind 5 to 15 kt with gusts to 25 kt near heavier
showers. Seas 3 to 5 ft. Wave Detail: East 4 ft at 8 seconds,
east 3 ft at 4 seconds and west 2 ft at 8 seconds. Numerous
showers with isolated thunderstorms. Locally heavy showers
possible.
.TONIGHT...Southeast wind 5 to 10 kt. Seas 3 to 5 ft. Wave
Detail: East 4 ft at 8 seconds, southeast 2 ft at 4 seconds and
west 2 ft at 8 seconds. Scattered showers with isolated
thunderstorms.
.MONDAY...Southeast wind 10 kt. Seas 3 to 4 ft. Wave Detail: East
3 ft at 8 seconds, southeast 2 ft at 4 seconds and southwest 2 ft
at 9 seconds. Scattered showers with isolated thunderstorms.
.MONDAY NIGHT...Southeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: East 3 ft at 8 seconds, southeast 2 ft at 4 seconds and
southwest 2 ft at 8 seconds. Scattered showers with isolated
thunderstorms.
.TUESDAY...Southeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: East 3 ft at 8 seconds, southeast 2 ft at 4 seconds
southwest 2 ft at 8 seconds. A slight chance of thunderstorms.
.WEDNESDAY AND THURSDAY...South to southwest wind 10 kt. Seas 4
to 6 ft. Wave Detail: East 4 ft at 8 seconds, southwest 2 ft at 4
seconds and southwest 3 ft at 9 seconds. A chance of showers with
a slight chance of thunderstorms.

$$