FZMY50 PGUM 241842

CWFGUM



Coastal Waters Forecast for the Mariana Islands

National Weather Service Tiyan GU

442 AM ChST Sat Oct 25 2025



Marianas Waters out to 40 nautical miles



PMZ150-250830-

442 AM ChST Sat Oct 25 2025



.Synopsis for Marianas Waters...

Gentle to moderate easterlies will prevail across the region the 

next several days. Combined seas of 4 to 6 feet, comprised of a 

dominant trade swell and pulses of northerly swell and wind waves,

are expected to persist through at least the first half of next

week. A few thunderstorms are possible through tonight.



$$



PMZ151>154-250830-

MARIANAS COASTAL WATERS-

442 AM ChST Sat Oct 25 2025



.TODAY...East wind 10 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft 

at 9 seconds, east 2 ft at 4 seconds and north 2 ft at 10 seconds.

Isolated thunderstorms. 

.TONIGHT...East wind 5 to 10 kt. Seas 4 to 5 ft. Wave Detail:

East 4 ft at 9 seconds, east 2 ft at 4 seconds and north 2 ft at

10 seconds. Scattered showers with isolated thunderstorms. 

.SUNDAY AND SUNDAY NIGHT...East wind 10 to 15 kt. Seas 4 to 6 ft.

Wave Detail: East 4 ft at 9 seconds, north 3 ft at 10 seconds and

east 2 ft at 4 seconds.

.MONDAY THROUGH TUESDAY...East wind 10 to 15 kt. Seas 4 to 6 ft.

Wave Detail: East 4 ft at 9 seconds, east 3 ft at 4 seconds and

north 3 ft at 10 seconds.

.WEDNESDAY...East wind 10 kt. Seas 3 to 5 ft. Wave Detail: East

3 ft at 8 seconds, northeast 3 ft at 8 seconds and east 2 ft at

4 seconds.



$$