326
FZMY50 PGUM 141833
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
433 AM ChST Wed Oct 15 2025

Marianas Waters out to 40 nautical miles

PMZ150-150900-
433 AM ChST Wed Oct 15 2025

.Synopsis for Marianas Waters...Fresh to occasionally strong
southeasterlies are expected in Guam and Rota waters through late
tonight while remaining moderate to fresh at Tinian and Saipan
as Invest 96W passes by to the southwest of Guam today. Combined
seas of 6 to 8 feet near Guam and Rota, and 5 to 7 feet near
Tinian and Saipan, will diminish 1 to 2 feet by Thursday. Showers
and thunderstorms, primarily across Guam and Rota waters, will
persist through tonight.

$$

PMZ151-152-150900-
Guam Coastal Waters-Rota Coastal Waters-
433 AM ChST Wed Oct 15 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH EARLY THURSDAY
MORNING...

.TODAY...Southeast wind 15 to 25 kt. Seas 6 to 8 ft. Wave Detail:
Southeast 5 ft at 6 seconds, north 5 ft at 12 seconds and east
3 ft at 8 seconds. Numerous locally heavy showers with isolated
thunderstorms.
.TONIGHT...East wind 10 to 15 kt. Seas around 6 ft. Wave Detail:
North 5 ft at 12 seconds, east 4 ft at 7 seconds and east 3 ft at
4 seconds. Numerous showers with isolated thunderstorms.
.THURSDAY...East wind 10 to 20 kt. Seas around 5 to 7 ft. Wave
Detail: East 4 ft at 5 seconds, east 3 ft at 8 seconds and north
3 ft at 12 seconds. Scattered showers with isolated thunderstorms.
.THURSDAY NIGHT...East wind 10 to 15 kt. Seas around 5 to 7 ft.
Wave Detail: East 3 ft at 4 seconds, east 3 ft at 8 seconds and
north 3 ft at 12 seconds.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 6 ft. Wave Detail:
East 4 ft at 8 seconds, north 4 ft at 12 seconds and east 3 ft at
5 seconds.
.SATURDAY THROUGH SUNDAY...East wind 10 to 15 kt. Seas 5 to 6 ft.
Wave Detail: East 4 ft at 10 seconds, north 4 ft at 12 seconds
and east 3 ft at 4 seconds. A chance of showers.

$$

PMZ153-154-150900-
Tinian Coastal Waters-Saipan Coastal Waters-
433 AM ChST Wed Oct 15 2025

.TODAY...East wind 10 to 20 kt. Seas 5 to 7 ft. Wave Detail:
North 5 ft at 12 seconds, east 4 ft at 8 seconds and east 3 ft at
5 seconds. Scattered showers with isolated thunderstorms.
.TONIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
North 5 ft at 12 seconds, east 4 ft at 7 seconds and east 3 ft at
4 seconds. Scattered showers with isolated thunderstorms.
.THURSDAY...East wind 10 to 15 kt. Seas around 4 to 6 ft. Wave
Detail: East 3 ft at 5 seconds, east 3 ft at 7 seconds and north
3 ft at 12 seconds. Scattered showers with isolated thunderstorms.
.THURSDAY NIGHT...East wind 10 to 20 kt. Seas 4 to 6 ft. Wave
Detail: East 4 ft at 7 seconds, east 4 ft at 5 seconds and north
3 ft at 12 seconds.
.FRIDAY...East wind 15 to 20 kt. Seas 5 to 7 ft. Wave Detail:
East 4 ft at 10 seconds, north 4 ft at 12 seconds and east 3 ft
at 5 seconds.
.SATURDAY...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East
5 ft at 10 seconds, north 4 ft at 12 seconds and east 3 ft at
5 seconds. A chance of showers.
.SUNDAY...East wind 10 to 15 kt. Seas 6 to 8 ft. Wave Detail:
East 5 ft at 9 seconds, northeast 4 ft at 10 seconds and east 3 ft
at 5 seconds. A chance of showers.

$$