486
FZMY50 PGUM 050704
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
504 PM ChST Sun Oct 5 2025

Marianas Waters out to 40 nautical miles

PMZ150-052215-
504 PM ChST Sun Oct 5 2025

.Synopsis for Marianas Waters...Combined seas of 3 to 4 feet and
light to gentle winds are expected to build Monday night and
Tuesday as a tropical disturbance (Invest 95W) approaches the
region. Though Invest 95W is expected to remain disorganized, low
visibility due to heavy rain, gusty winds and choppy seas up to 8
feet are possible Tuesday. Seas and winds will then decrease
Wednesday as Invest 95W moves northwest and away from the region.
An approaching TUTT cell will continue to keep the risk of
isolated thunderstorms in the forecast for at least the next few
days.

$$

PMZ151>154-052215-
MARIANAS COASTAL WATERS-
504 PM ChST Sun Oct 5 2025

.TONIGHT...Southeast wind 5 kt. Seas around 3 ft. Wave Detail:
East 3 ft at 8 seconds. Scattered showers with isolated
thunderstorms after midnight.
.MONDAY...Southeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail:
East 3 ft at 8 seconds and southeast 2 ft at 5 seconds. Isolated
thunderstorms.
.MONDAY NIGHT...East wind 5 to 10 kt, becoming 10 to 20 kt after
midnight. Seas 3 to 5 ft. Wave Detail: East 4 ft at 8 seconds and
east 4 ft at 6 seconds. Scattered showers with isolated
thunderstorms.
.TUESDAY...Southeast wind 10 to 20 kt with gusts to 30 kt. Seas
5 to 8 ft. Wave Detail: Southeast 6 ft at 6 seconds and east 5 ft
at 8 seconds. Numerous showers with isolated thunderstorms.
Locally heavy showers possible.
.TUESDAY NIGHT...South wind 10 to 20 kt. Seas 5 to 7 ft. Wave
Detail: East 5 ft at 8 seconds and south 5 ft at 5 seconds.
Scattered showers with isolated thunderstorms.
.WEDNESDAY...Southeast wind 5 to 15 kt. Seas 3 to 5 ft. Wave
Detail: Southeast 4 ft at 8 seconds and southeast 3 ft at 4
seconds. Isolated thunderstorms.
.THURSDAY...Northeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: East 3 ft at 8 seconds and northeast 2 ft at 4 seconds. A
chance of showers with a slight chance of thunderstorms.
.FRIDAY...Northeast wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail:
East 4 ft at 8 seconds and northeast 2 ft at 4 seconds. A chance
of showers.

$$