FZMY50 PGUM 051848

CWFGUM



Coastal Waters Forecast for the Mariana Islands

National Weather Service Tiyan GU

448 AM ChST Thu Aug 6 2026



Marianas Waters out to 40 nautical miles



PMZ150-060800-

448 AM ChST Thu Aug 6 2026



.Synopsis for Marianas Waters...

Gentle to fresh westerlies will prevail across the Marianas 

today, as a westerly monsoon surge slows over the next few days. 

Combined seas of 8 to 11 feet are expected through Thursday night,

to then drop a foot after and persist as such for several more 

days, remaining hazardous to small craft. As such, the Small Craft

Advisory is likely to be extended, if conditions warrant.



$$



PMZ151>154-060800-

MARIANAS COASTAL WATERS-

448 AM ChST Thu Aug 6 2026



...SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH EARLY FRIDAY 

MORNING...



.TODAY...West wind 10 to 20 kt. Seas 9 to 11 ft. Wave Detail:

West 8 ft at 13 seconds, northwest 6 ft at 14 seconds and west 4 

ft at 4 seconds. Scattered showers with isolated thunderstorms. 

Locally heavy rainfall possible.

.THURSDAY NIGHT...West wind 10 to 15 kt. Seas 9 to 11 ft. Wave 

Detail: West 8 ft at 13 seconds, northwest 6 ft at 14 seconds and 

west 3 ft at 4 seconds. Scattered showers with isolated 

thunderstorms. 

.FRIDAY...West wind 10 to 20 kt. Seas 8 to 10 ft. Wave Detail:

Northwest 8 ft at 14 seconds, northwest 6 ft at 14 seconds and

west 4 ft at 5 seconds. Scattered showers with isolated 

thunderstorms. 

.FRIDAY NIGHT...West wind 15 to 20 kt. Seas 8 to 11 ft. Wave 

Detail: West 7 ft at 13 seconds, northwest 5 ft at 14 seconds, 

east 4 ft at 10 seconds and west 4 ft at 5 seconds. Scattered 

showers with isolated thunderstorms. 

.SATURDAY THROUGH MONDAY...Southwest wind 15 to 25 kt. Seas 9 to

12 ft. Wave Detail: West 9 ft at 9 seconds, west 6 ft at

5 seconds and northwest 5 ft at 14 seconds. A chance of showers 

with a slight chance of thunderstorms. 



$$