281
FZMY50 PGUM 151801
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
401 AM ChST Wed Jul 16 2025

Marianas Waters out to 40 nautical miles

PMZ150-161215-
401 AM ChST Wed Jul 16 2025

.Synopsis for Marianas Waters...Gentle to moderate east to southeast
winds will continue across the region through the weekend, with
seas of 4 to 6 feet increasing to 5 to 7 feet by Thursday night as
the west-southwest swell builds slightly. The potential for
showers and thunderstorms is increasing through the end of the
week as a couple of surface troughs pass through the region, along
with the TUTT and TUTT cell passing overhead. Periods of
unsettled weather expected to continue into the weekend as the
monsoonal pattern in western Micronesia and near-equatorial trough
near Chuuk move near the Marianas.

$$

PMZ151>154-161215-
MARIANAS COASTAL WATERS-
401 AM ChST Wed Jul 16 2025

.TODAY...East wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: East
5 ft at 9 seconds and east 3 ft at 4 seconds. Scattered showers
with isolated thunderstorms.
.TONIGHT...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 9 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.

$$