365
FZMY50 PGUM 171800
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 AM ChST Mon Aug 18 2025

Marianas Waters out to 40 nautical miles

PMZ150-180900-
400 AM ChST Mon Aug 18 2025

.Synopsis for Marianas Waters...Gentle to moderate winds will
continue through Tuesday night, with occasional fresh winds
Tuesday. Winds will then gradually subside, becoming light to
gentle midweek. Combined seas of 3 to 5 feet will subside to
between 3 and 4 feet Wednesday. A tropical disturbance will
approach the Marianas Tuesday, bringing increased convection to
the waters.

$$

PMZ151>154-180900-
MARIANAS COASTAL WATERS-
400 AM ChST Mon Aug 18 2025

.TODAY...East wind 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: East 4
ft at 8 seconds and east 3 ft at 4 seconds. Scattered showers with
isolated thunderstorms.
.TONIGHT...East wind 10 to 15 kt with occasional gusts to 25 kt.
Seas 4 to 5 ft. Wave Detail: Northeast 4 ft at 8 seconds and east
3 ft at 5 seconds. Isolated thunderstorms.
.TUESDAY...Southeast wind 10 to 20 kt. Seas 4 to 5 ft. Wave
Detail: East 4 ft at 8 seconds and southeast 4 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.TUESDAY NIGHT...Southeast wind 5 to 15 kt. Seas 3 to 5 ft. Wave
Detail: East 4 ft at 8 seconds and southeast 3 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.WEDNESDAY...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail:
East 4 ft at 8 seconds and east 2 ft at 4 seconds. A chance of
showers in the evening. A slight chance of thunderstorms.
.THURSDAY...East wind 10 kt. Seas 3 to 4 ft. Wave Detail: East 4
ft at 8 seconds and east 2 ft at 4 seconds. A slight chance of
thunderstorms.
.FRIDAY...East wind 10 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft
at 8 seconds and east 2 ft at 4 seconds. A chance of showers in
the evening. A slight chance of thunderstorms.

$$