540
FZMY50 PGUM 111800
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 AM ChST Fri Sep 12 2025

Marianas Waters out to 40 nautical miles

PMZ150-120900-
400 AM ChST Fri Sep 12 2025

.Synopsis for Marianas Waters...Light to gentle trade winds and
combined seas of 3 to 5 feet are expected to persist through
early next week.

$$

PMZ151-152-120900-
Guam Coastal Waters-Rota Coastal Waters-
400 AM ChST Fri Sep 12 2025

.TODAY...Southeast wind 5 kt. Seas 3 to 4 ft. Wave Detail:
Northeast 3 ft at 9 seconds and east 2 ft at 8 seconds. Isolated
thunderstorms.
.FRIDAY NIGHT...Southeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: Northeast 3 ft at 9 seconds, east 2 ft at 8 seconds and
southeast 2 ft at 4 seconds. Isolated thunderstorms.
.SATURDAY...East wind 5 to 10 kt. Seas around 3 to 4 ft. Wave
Detail: Northeast 2 ft at 9 seconds, east 2 ft at 8 seconds and
east 2 ft at 4 seconds. Isolated thunderstorms.
.SATURDAY NIGHT AND SUNDAY...East wind 10 kt. Seas around 3 ft.
Wave Detail: East 2 ft at 8 seconds, northeast 2 ft at 9 seconds
and east 2 ft at 4 seconds. Scattered showers with isolated
thunderstorms.
.SUNDAY NIGHT AND MONDAY...East wind 10 kt. Seas 3 to 4 ft. Wave
Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds.
.TUESDAY...South wind 5 kt. Seas around 3 ft. Wave Detail: East
3 ft at 8 seconds. A chance of showers and a slight chance of
thunderstorms.

$$

PMZ153-154-120900-
Tinian Coastal Waters-Saipan Coastal Waters-
400 AM ChST Fri Sep 12 2025

.TODAY...Southeast wind 5 to 10 kt. Seas around 4 ft. Wave
Detail: Northeast 4 ft at 9 seconds east 2 ft at 8 seconds and
southeast 2 ft at 4 seconds. Isolated thunderstorms.
.FRIDAY NIGHT...Southeast wind 5 to 10 kt. Seas around 4 ft. Wave
Detail: Northeast 3 ft at 9 seconds and southeast 2 ft at 4
seconds and east 2 ft at 8 seconds. Isolated thunderstorms.
.SATURDAY...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail:
Northeast 2 ft at 9 seconds, east 2 ft at 4 seconds and east 2 ft
at 8 seconds.
.SATURDAY NIGHT...East wind 10 kt. Seas 3 to 4 ft. Wave Detail:
East 3 ft at 8 seconds, northeast 2 ft at 9 seconds and east 2 ft
at 4 seconds. Scattered showers and isolated thunderstorms.
.SUNDAY...East wind 10 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft
at 8 seconds, northeast 2 ft at 9 seconds and east 2 ft at 4
seconds.
.SUNDAY NIGHT AND MONDAY...East wind 10 kt. Seas 3 to 4 ft. Wave
Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds.
.TUESDAY...South wind 5 kt. Seas around 3 ft. Wave Detail: East
3 ft at 8 seconds. A chance of showers with a slight chance of
thunderstorms.

$$