553
FZMY50 PGUM 291857
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
457 AM ChST Tue Sep 30 2025

Marianas Waters out to 40 nautical miles

PMZ150-301000-
457 AM ChST Tue Sep 30 2025

.Synopsis for Marianas Waters...Light to gentle winds and
combined seas of 3 to 5 feet are expected this week. A tropical
disturbance continues to move westward, away from the Marianas.
Trade-wind convergence and subtle surface troughs following this
feature are expected to bring periods of scattered showers and
isolated thunderstorms across the region over the next couple
days.

$$

PMZ151>154-301000-
MARIANAS COASTAL WATERS-
457 AM ChST Tue Sep 30 2025

.TODAY...East wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: North
3 ft at 9 seconds east 3 ft at 9 seconds and east 2 ft at 4
seconds. Scattered showers with isolated thunderstorms.
.TONIGHT...East wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail:
North 3 ft at 9 seconds, east 3 ft at 9 seconds, and east 2 ft at
4 seconds. Isolated thunderstorms.
.WEDNESDAY...East wind 5 to 10 kt. Seas around 4 ft. Wave Detail:
Northeast 3 ft at 8 seconds, east 2 ft at 4 seconds and north
2 ft at 9 seconds. Scattered showers with isolated thunderstorms.
.WEDNESDAY NIGHT...Northeast wind 5 to 10 kt. Seas around 4 ft.
Wave Detail: Northeast 3 ft at 8 seconds, northeast 2 ft at
4 seconds and north 2 ft at 9 seconds.
.THURSDAY THROUGH SATURDAY...Southeast wind 10 kt. Seas around
4 ft. Wave Detail: East 3 ft at 8 seconds, east 2 ft at 4 seconds
and north 2 ft at 9 seconds. A slight chance of thunderstorms.

$$