119
FZMY50 PGUM 150657
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
457 PM ChST Tue Jul 15 2025

Marianas Waters out to 40 nautical miles

PMZ150-152200-
457 PM ChST Tue Jul 15 2025

.Synopsis for Marianas Waters...Gentle to moderate southeast to
east winds will continue across the region through the weekend,
with seas of 4 to 6 feet building to 5 to 7 feet Thursday night
as the west-southwest swell builds slightly. The potential for
thunderstorms is increasing as the TUTT and TUTT cell are moving
closer from the east. Scattered showers are expected to move into
the Marianas tonight as a subtle trade-wind trough moves through
tonight, with periods of unsettled weather expected to continue
as the monsoonal pattern in western Micronesia and near-
equatorial trough near Chuuk move near the Marianas.

$$

PMZ151>154-152200-
MARIANAS COASTAL WATERS-
457 PM ChST Tue Jul 15 2025

.TONIGHT...Southeast wind 10 to 15 kt. Seas 4 to 6 ft. Wave
Detail: East 4 ft at 9 seconds, southeast 3 ft at 4 seconds and
west 2 ft at 8 seconds. Scattered showers by midnight. Isolated
thunderstorms.
.WEDNESDAY...East wind 10 kt. Seas 4 to 6 ft. Wave Detail: East
5 ft at 9 seconds, east 2 ft at 4 seconds and west 2 ft at
8 seconds. Scattered showers with isolated thunderstorms.
.WEDNESDAY NIGHT...East wind 10 kt. Seas 4 to 6 ft. Wave Detail:
East 5 ft at 9 seconds, east 2 ft at 4 seconds and west 2 ft at
8 seconds. Scattered showers with isolated thunderstorms.
.THURSDAY...East wind 10 kt. Seas 5 to 6 ft. Wave Detail: East
5 ft at 8 seconds, southwest 3 ft at 8 seconds and east 2 ft at
4 seconds. Isolated thunderstorms.
.THURSDAY NIGHT...Southeast wind 10 to 15 kt. Seas 5 to 7 ft.
Wave Detail: East 5 ft at 8 seconds, southwest 3 ft at 8 seconds
and southeast 3 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 8 seconds, west 4 ft at 8 seconds and east 3 ft at 4
seconds. A chance of showers with a slight chance of thunderstorms.
.SATURDAY THROUGH SUNDAY...East wind 10 to 15 kt. Seas 4 to 6 ft.
Wave Detail: East 4 ft at 9 seconds, west 4 ft at 10 seconds and
east 3 ft at 4 seconds. A chance of showers with a slight chance
of thunderstorms.

$$