742
FZMY50 PGUM 010642
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
442 PM ChST Mon Dec 1 2025

Marianas Waters out to 40 nautical miles

PMZ150-012200-
442 PM ChST Mon Dec 1 2025

.Synopsis for Marianas Waters...
Moderate to fresh trades and combined seas of 6 to 9 feet are
expected through Wednesday as northerly swell moves through the
region, generated by a distant low pressure system. Afterwards,
conditions gradually subside to gentle to moderate winds and 5 to
7 foot seas late week.

$$

PMZ151-152-012200-
Guam Coastal Waters-Rota Coastal Waters-
442 PM ChST Mon Dec 1 2025

.TONIGHT...East wind 10 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 6 ft at 8 seconds, east 4 ft at 6 seconds and northeast 3 ft
at 13 seconds. Scattered showers. Isolated thunderstorms across
southern Guam waters.
.TUESDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail:
East 7 ft at 8 seconds, east 4 ft at 6 seconds and northeast 4 ft
at 13 seconds.
.TUESDAY NIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 6 ft at 8 seconds, east 4 ft at 6 seconds and
northeast 4 ft at 13 seconds.
.WEDNESDAY...East wind 15 to 20 kt. Seas around 8 ft. Wave
Detail: East 7 ft at 8 seconds, east 4 ft at 6 seconds and
northeast 3 ft at 13 seconds.
.WEDNESDAY NIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave
Detail: East 7 ft at 8 seconds, east 3 ft at 6 seconds and
northeast 3 ft at 13 seconds.
.THURSDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 8 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds. A chance of showers with a slight chance of
thunderstorms.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 8 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds. A chance of showers.
.SATURDAY...East wind 10 to 15 kt. Seas 6 to 7 ft. Wave Detail:
East 6 ft at 8 seconds, north 3 ft at 11 seconds, east 2 ft at
4 seconds and northeast 2 ft at 13 seconds.

$$

PMZ153-154-012200-
Tinian Coastal Waters-Saipan Coastal Waters-
442 PM ChST Mon Dec 1 2025

.TONIGHT...East wind 10 to 20 kt. Seas 7 to 9 ft. Wave Detail:
East 6 ft at 8 seconds east 4 ft at 6 seconds and northeast 4 ft
at 14 seconds.
.TUESDAY...Southeast wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 7 ft at 8 seconds, southeast 4 ft at 6 seconds and
northeast 4 ft at 14 seconds.
.TUESDAY NIGHT...Southeast wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 7 ft at 8 seconds, east 4 ft at 6 seconds and
northeast 4 ft at 13 seconds.
.WEDNESDAY...Southeast wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 7 ft at 8 seconds, southeast 4 ft at 6 seconds and
northeast 4 ft at 13 seconds.
.WEDNESDAY NIGHT...Southeast wind 15 to 20 kt. Seas around 8 ft.
Wave Detail: East 7 ft at 8 seconds, southeast 4 ft at 5 seconds
and northeast 3 ft at 13 seconds.
.THURSDAY...East wind 10 to 15 kt. Seas 6 to 7 ft. Wave Detail:
East 6 ft at 8 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds. A chance of showers.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 8 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds.
.SATURDAY...East wind 10 kt. Seas around 7 ft. Wave Detail: East
6 ft at 8 seconds, north 3 ft at 11 seconds, northeast 3 ft at 13
seconds and east 2 ft at 4 seconds.

$$