137
FZMY50 PGUM 160617
CWFGUM

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

Marianas Waters out to 40 nautical miles

PMZ150-162130-
417 PM ChST Wed Jul 16 2025

.Synopsis for Marianas Waters...Gentle to moderate east to southeast
winds will continue across the region through the weekend. The
west-southwest swell has been slower to build so seas of 4 to 6
feet are expected to continue for a couple more days before
building to 5 to 7 feet around Friday. The TUTT and TUTT cell is
now near the Marianas and an approaching trough will help to
generate scattered showers and isolated thunderstorms across the
coastal waters tonight. Passing troughs will promote periods of
scattered showers and isolated thunderstorms across the waters
through the weekend.

$$

PMZ151>154-162130-
MARIANAS COASTAL WATERS-
417 PM ChST Wed Jul 16 2025

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

$$