FZMY50 PGUM 090642
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
442 PM ChST Thu Jul 9 2026

Marianas Waters out to 40 nautical miles

PMZ150-092030-
442 PM ChST Thu Jul 9 2026

.Synopsis for Marianas Waters...
Significant west to southwest swells continue to emanate from 
Typhoon Bavi (09W) and its trailing monsoon pattern, maintaining 
seas hazardous to small craft. Altimetry and Tanapag buoy data 
indicate combined seas sustaining at around 9 to 10 feet over 
western coastal waters of the Marianas as seas take longer to 
relax below hazardous levels than previously expected. So the 
Small Craft Advisory has been extended through Friday afternoon, 
after which seas may fall below hazardous levels of 10 feet.

$$

PMZ151>154-092030-
MARIANAS COASTAL WATERS-
442 PM ChST Thu Jul 9 2026

...SMALL CRAFT ADVISORY IN EFFECT NOW IN EFFECT THROUGH FRIDAY 
AFTERNOON...

.TONIGHT...Northeast wind 5 to 10 kt. Seas 8 to 10 ft. Wave
Detail: West 9 ft at 11 seconds, southwest 3 ft at 9 seconds and
northeast 2 ft at 4 seconds. 
.FRIDAY...Northeast wind 5 to 10 kt. Seas 7 to 10 ft. Wave 
Detail: West 9 ft at 11 seconds, east 3 ft at 9 seconds, and 
northeast 2 ft at 4 seconds.
.FRIDAY NIGHT...Northeast wind 10 to 15 kt. Seas 6 to 8 ft. Wave
Detail: West 8 ft at 11 seconds, northeast 2 ft at 4 seconds and 
east 2 ft at 9 seconds. 
.SATURDAY...Northeast wind 10 to 15 kt. Seas 6 to 8 ft. Wave
Detail: West 7 ft at 11 seconds, northeast 3 ft at 4 seconds and 
east 3 ft at 9 seconds. Scattered showers with isolated 
thunderstorms. 
.SATURDAY NIGHT...East wind 10 to 15 kt. Seas 6 to 8 ft. Wave
Detail: West 6 ft at 10 seconds, east 4 ft at 10 seconds and east
3 ft at 5 seconds. Scattered showers with isolated thunderstorms.
.SUNDAY...Southeast wind 10 to 20 kt. Seas 6 to 8 ft. Wave
Detail: Northwest 6 ft at 10 seconds, east 4 ft at 9 seconds and
southeast 4 ft at 4 seconds. Scattered showers with a slight 
chance of thunderstorms. 
.MONDAY...South wind 10 to 20 kt. Seas 5 to 7 ft. Wave Detail:
North 4 ft at 9 seconds, east 4 ft at 9 seconds and southeast
3 ft at 4 seconds. A chance of showers with a slight chance of
thunderstorms. 
.TUESDAY...South wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
Southwest 7 ft at 8 seconds and south 4 ft at 6 seconds. A chance
of showers with a slight chance of thunderstorms.  

$$