347
FZMY50 PGUM 090643
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
443 PM ChST Thu Oct 9 2025

Marianas Waters out to 40 nautical miles

PMZ150-092200-
443 PM ChST Thu Oct 9 2025

.Synopsis for Marianas Waters...Winds are expected to be light to
gentle for the next few days, and will become moderate by Sunday.
Combined seas of 3 to 5 feet will persist through Friday, to then
build to 5 to 7 feet thereafter, as a long-period north swell
moves through the region from the distant Typhoon Halong.

$$

PMZ151>154-092200-
MARIANAS COASTAL WATERS-
443 PM ChST Thu Oct 9 2025

.TONIGHT...East wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail:
East 4 ft at 8 seconds and east 2 ft at 4 seconds. Scattered
showers around midnight.
.FRIDAY...East wind 10 kt. Seas around 3 to 5 ft. Wave Detail:
Northeast 4 ft at 8 seconds and east 2 ft at 4 seconds. Scattered
showers with isolated thunderstorms.
.FRIDAY NIGHT...East wind 5 kt. Seas 3 to 5 ft. Wave Detail:
Northeast 4 ft at 8 seconds. Isolated thunderstorms.
.SATURDAY...East wind 5 kt. Seas around 4 to 6 ft. Wave Detail:
Northeast 4 ft at 9 seconds and east 3 ft at 8 seconds. Isolated
thunderstorms.
.SATURDAY NIGHT...East wind 5 to 10 kt. Seas 4 to 6 ft. Wave
Detail: North 4 ft at 10 seconds, east 3 ft at 8 seconds and east
2 ft at 4 seconds.
.SUNDAY THROUGH MONDAY...East wind 10 to 15 kt. Seas 5 to 7 ft.
Wave Detail: Northeast 5 ft at 10 seconds, east 3 ft at 4 seconds
and east 3 ft at 8 seconds.
.TUESDAY...East wind 15 kt. Seas 4 to 6 ft. Wave Detail:
Northeast 5 ft at 8 seconds, east 2 ft at 8 seconds and east 3 ft
at 4 seconds. A chance of showers with a slight chance of
thunderstorms.

$$