755
FZMY50 PGUM 292023 AAA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...UPDATED
National Weather Service Tiyan GU
623 AM ChST Sat Aug 30 2025

Marianas Waters out to 40 nautical miles

PMZ150-300815-
623 AM ChST Sat Aug 30 2025

.Synopsis for Marianas Waters...Gentle to moderate trade winds will
be occasionally fresh through tonight. Near-gale gusts are possible
tonight within heavy showers. Combined seas of 5 to 7 feet are
expected to taper down a foot over the weekend, to then diminish
another 2 feet by the middle of next week as trade swell and wind
waves diminish.

$$

PMZ151-300815-
Guam Coastal Waters-
623 AM ChST Sat Aug 30 2025

Updated to increase showers.

.REST OF TODAY...Southeast wind 5 to 15 kt with occasional gusts
to 25 kt near heavier showers. Seas 5 to 7 ft. Wave Detail: East
6 ft at 8 seconds and southeast 3 ft at 4 seconds. Numerous
showers with isolated thunderstorms. Locally heavy showers
possible.
.TONIGHT...Southeast wind 10 to 20 kt with gusts to 30 kt near
heavier showers. Seas 5 to 7 ft. Wave Detail: East 6 ft at 8
seconds and southeast 4 ft at 4 seconds. Numerous heavy showers
with isolated thunderstorms.
.SUNDAY...Southeast wind 5 to 10 kt. Seas around 6 ft. Wave Detail:
Southeast 6 ft at 8 seconds and south 2 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SUNDAY NIGHT...Southeast wind 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: East 5 ft at 8 seconds and southeast 2 ft at 4 seconds.
Scattered showers.
.MONDAY THROUGH WEDNESDAY...Southeast wind 5 to 15 kt. Seas 3 to
5 ft. Wave Detail: East 4 ft at 8 seconds and southeast 3 ft at 4
seconds. A chance of showers with a slight chance of
thunderstorms.

$$

PMZ152>154-300815-
Rota Coastal Waters-Tinian Coastal Waters-Saipan Coastal Waters-
623 AM ChST Sat Aug 30 2025

.REST OF TODAY...Southeast wind 5 to 15 kt with occasional gusts
to 25 kt near heavier showers. Seas 5 to 7 ft. Wave Detail: East
6 ft at 8 seconds and southeast 3 ft at 4 seconds. Scattered
showers with isolated thunderstorms. Locally heavy showers
possible.
.TONIGHT...Southeast wind 10 to 20 kt with gusts to 30 kt near
heavier showers. Seas 5 to 7 ft. Wave Detail: East 6 ft at 8
seconds and southeast 4 ft at 4 seconds. Numerous heavy showers
with isolated thunderstorms.
.SUNDAY...Southeast wind 5 to 10 kt. Seas around 6 ft. Wave Detail:
Southeast 6 ft at 8 seconds and south 2 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SUNDAY NIGHT...Southeast wind 5 to 10 kt. Seas 4 to 5 ft. Wave
Detail: East 5 ft at 8 seconds and southeast 2 ft at 4 seconds.
Scattered showers.
.MONDAY THROUGH WEDNESDAY...Southeast wind 5 to 15 kt. Seas 3 to
5 ft. Wave Detail: East 4 ft at 8 seconds and southeast 3 ft at 4
seconds. A chance of showers with a slight chance of
thunderstorms.

$$