009
FZMY50 PGUM 021802
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
402 AM ChST Wed Dec 3 2025

Marianas Waters out to 40 nautical miles

PMZ150-030915-
402 AM ChST Wed Dec 3 2025

.Synopsis for Marianas Waters...
Moderate to fresh trades and combined seas of 6 to 8 feet are
expected to decrease slightly as the elevated trade winds east of
the region weaken, and the long period northeast swell subsides.
Winds are expected to become gentle to moderate Thursday, with
seas decreasing to 5 to 7 feet. As a trough passes near the
Marianas around Thursday night and Friday, scattered showers are
expected to move into the Marianas with isolated thunderstorms
possible for Guam and Rota coastal waters.

$$

PMZ151-152-030915-
Guam Coastal Waters-Rota Coastal Waters-
402 AM ChST Wed Dec 3 2025

.TODAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail: East
6 ft at 10 seconds, east 4 ft at 6 seconds and northeast 4 ft at
13 seconds. Isolated thunderstorms in southern Guam waters this
morning.
.TONIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 6 ft at 9 seconds, east 4 ft at 6 seconds and northeast 3 ft
at 13 seconds.
.THURSDAY...Southeast wind 15 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 8 seconds, southeast 3 ft at 5 seconds and northeast
3 ft at 13 seconds.
.THURSDAY NIGHT...Southeast wind 10 to 15 kt. Seas 5 to 7 ft.
Wave Detail: East 5 ft at 8 seconds, southeast 3 ft at 5 seconds
and northeast 3 ft at 13 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, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds. Scattered showers.
.SATURDAY THROUGH SUNDAY...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,
north 3 ft at 10 seconds and north 3 ft at 11 seconds.

$$

PMZ153-154-030915-
Tinian Coastal Waters-Saipan Coastal Waters-
402 AM ChST Wed Dec 3 2025

.TODAY...Southeast wind 15 to 20 kt. Seas 7 to 8 ft. Wave Detail:
East 6 ft at 8 seconds, southeast 4 ft at 6 seconds and northeast
4 ft at 13 seconds.
.TONIGHT...Southeast wind 15 to 20 kt. Seas 6 to 8 ft. Wave
Detail: East 7 ft at 8 seconds, southeast 3 ft at 5 seconds and
northeast 3 ft at 13 seconds.
.THURSDAY...Southeast wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: East 6 ft at 8 seconds, southeast 3 ft at 4 seconds and
northeast 3 ft at 13 seconds.
.THURSDAY NIGHT...Southeast wind 10 to 15 kt. Seas 5 to 7 ft.
Wave Detail: East 5 ft at 8 seconds, southeast 3 ft at 4 seconds
and northeast 3 ft at 13 seconds.
.FRIDAY...East wind 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. Scattered showers.
.SATURDAY...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East 5
ft at 8 seconds, east 3 ft at 4 seconds, northeast 3 ft at 9
seconds and north 3 ft at 11 seconds.
.SUNDAY...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, northeast 3 ft at
10 seconds and north 3 ft at 10 seconds.

$$