009
FZMY50 PGUM 111859
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
459 AM ChST Sun Oct 12 2025

Marianas Waters out to 40 nautical miles

PMZ150-120830-
459 AM ChST Sun Oct 12 2025

.Synopsis for Marianas Waters...
Combined seas will remain at around 4 to 6 feet through the
period, comprised of a long-period north swell and a secondary
trade swell. Winds will be gentle to moderate out of the northeast
to east through the weekend, becoming moderate to fresh at times
early next week as a weak disturbance lifts northwest through the
area. Seas may increase by a foot or so around Tuesday with an
expected increase in winds and wind waves.

$$

PMZ151>154-120830-
MARIANAS COASTAL WATERS-
459 AM ChST Sun Oct 12 2025

.TODAY...East wind 10 kt. Seas 4 to 6 ft. Wave Detail: North 4 ft
at 12 seconds, east 3 ft at 8 seconds and east 2 ft at 4 seconds.
.TONIGHT...East wind 10 kt. Seas 4 to 6 ft. Wave Detail: North 4
ft at 13 seconds, east 3 ft at 8 seconds and east 2 ft at 4 seconds.
.MONDAY...East wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail:
North 4 ft at 12 seconds, east 3 ft at 8 seconds and east 3 ft at
4 seconds.
.MONDAY NIGHT...East wind 15 kt. Seas 4 to 6 ft. Wave Detail:
North 4 ft at 11 seconds, east 3 ft at 5 seconds and east 3 ft at
8 seconds. Scattered showers.
.TUESDAY...East to southeast wind 15 to 20 kt. Seas 4 to 7 ft.
Wave Detail: East 4 ft at 8 seconds, north 4 ft at 11 seconds and
east 4 ft at 5 seconds. A chance of showers with a slight chance
of thunderstorms.
.WEDNESDAY...Southeast wind 15 kt. Seas 4 to 6 ft. Wave Detail:
East 4 ft at 8 seconds, north 4 ft at 11 seconds and east 3 ft at
5 seconds. Showers likely with a slight chance of thunderstorms.
Locally heavy showers possible.
.THURSDAY...East to southeast wind 10 to 15 kt. Seas 4 to 6 ft.
Wave Detail: East 4 ft at 8 seconds, north 4 ft at 12 seconds and
east 3 ft at 4 seconds. A chance of showers with a slight chance
of thunderstorms.

$$