029
FZMY50 PGUM 230527
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
327 PM ChST Tue Sep 23 2025

Marianas Waters out to 40 nautical miles

PMZ150-232100-
327 PM ChST Tue Sep 23 2025

.Synopsis for Marianas Waters...Gentle east to southeast winds
will persist through Wednesday night before becoming light
Thursday and Friday. Combined seas of 4 to 6 feet will increase
to between 6 and 8 feet Thursday night or Friday as a new pulse of
long-period north swell builds in from distant Typhoon Neoguri,
well to the north of the Marianas. Seas are a combination of
an ongoing north swell from distant Typhoon Neoguri, lingering
west swell from distant Typhoon Ragasa and a small east swell. Showers
and thunderstorms will persist through tonight before decreasing
Wednesday.

$$

PMZ151>154-232100-
MARIANAS COASTAL WATERS-
327 PM ChST Tue Sep 23 2025

.TONIGHT...East wind 5 to 10 kt. Seas 4 to 6 ft. Wave Detail:
West 4 ft at 11 seconds, north 3 ft at 11 seconds, east 2 ft at 4
seconds and east 2 ft at 8 seconds. Scattered showers with
isolated thunderstorms.
.WEDNESDAY...East wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail:
West 4 ft at 11 seconds, north 3 ft at 11 seconds, east 2 ft at
4 seconds and east 2 ft at 8 seconds.
.WEDNESDAY NIGHT...Southeast wind 5 to 10 kt. Seas 4 to 6 ft.
Wave Detail: West 4 ft at 11 seconds, north 3 ft at 11 seconds,
southeast 2 ft at 4 seconds and east 2 ft at 8 seconds.
.THURSDAY...East wind 5 to 10 kt. Seas 4 to 6 ft. Wave Detail:
Northeast 5 ft at 13 seconds, west 3 ft at 8 seconds and east
2 ft at 9 seconds.
.THURSDAY NIGHT...Southeast wind 5 to 10 kt. Seas 4 to 6 ft. Wave
Detail: Northeast 5 ft at 13 seconds, west 3 ft at 8 seconds and
east 2 ft at 9 seconds.
.FRIDAY...East wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail:
Northeast 7 ft at 14 seconds, west 3 ft at 9 seconds and east
2 ft at 9 seconds. A slight chance of thunderstorms.
.SATURDAY...East wind 5 to 10 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 7 ft at 14 seconds, west 3 ft at 9 seconds, east 2 ft
at 4 seconds and east 2 ft at 9 seconds. A slight chance of
thunderstorms.
.SUNDAY...East wind 10 kt. Seas 4 to 6 ft. Wave Detail: Northeast
5 ft at 12 seconds, west 3 ft at 9 seconds, east 2 ft at
4 seconds and east 2 ft at 9 seconds. A chance of showers with a
slight chance of thunderstorms.

$$