296
FZMY50 PGUM 030600
CWFGUM

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

Marianas Waters out to 40 nautical miles

PMZ150-032030-
400 PM ChST Wed Dec 3 2025

.Synopsis for Marianas Waters...
Moderate to fresh trades and combined seas of 7 to 9 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.

$$

PMZ151-152-032030-
Guam Coastal Waters-Rota Coastal Waters-
400 PM ChST Wed Dec 3 2025

.TONIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail:
East 7 ft at 9 seconds, east 4 ft at 6 seconds and northeast 3 ft
at 13 seconds.
.THURSDAY...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East
6 ft at 9 seconds, east 3 ft at 5 seconds and northeast 3 ft at
13 seconds. Isolated thunderstorms.
.THURSDAY NIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: East 5 ft at 9 seconds, east 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 6 ft. Wave Detail:
East 5 ft at 9 seconds, east 3 ft at 5 seconds and northeast 3 ft
at 13 seconds. Isolated thunderstorms.
.FRIDAY NIGHT...Southeast wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: East 5 ft at 9 seconds, northeast 3 ft at 12 seconds and
southeast 3 ft at 4 seconds.
.SATURDAY...East wind 10 to 15 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 6 ft at 10 seconds, north 3 ft at 11 seconds and east
2 ft at 4 seconds.
.SUNDAY THROUGH MONDAY...East wind 10 to 15 kt. Seas 6 to 8 ft.
Wave Detail: Northeast 6 ft at 10 seconds, north 3 ft at
10 seconds and east 3 ft at 4 seconds.

$$

PMZ153-154-032030-
Tinian Coastal Waters-Saipan Coastal Waters-
400 PM ChST Wed Dec 3 2025

.TONIGHT...Southeast wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 8 ft at 9 seconds, southeast 4 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 9 seconds, southeast 3 ft at 4 seconds and
northeast 3 ft at 13 seconds.
.THURSDAY NIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: East 5 ft at 9 seconds, east 3 ft at 4 seconds and
northeast 3 ft at 13 seconds.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds.
.FRIDAY NIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave
Detail: Northeast 5 ft at 9 seconds, northeast 3 ft at 12 seconds
and east 2 ft at 4 seconds.
.SATURDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
Northeast 6 ft at 10 seconds, east 3 ft at 4 seconds and north
3 ft at 11 seconds.
.SUNDAY THROUGH MONDAY...East wind 10 to 15 kt. Seas 5 to 7 ft.
Wave Detail: Northeast 6 ft at 10 seconds, north 3 ft at
10 seconds and east 3 ft at 4 seconds.

$$