767
FZMY50 PGUM 130723 CCA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...CORRECTED
National Weather Service Tiyan GU
523 PM ChST Mon Oct 13 2025

Marianas Waters out to 40 nautical miles

PMZ150-132200-
523 PM ChST Mon Oct 13 2025

.Synopsis for Marianas Waters...
Combined seas of 5 to 7 feet will continue for the next day or so,
mainly comprised of a long-period north swell and trade swell.
Winds will be moderate and easterly tonight, becoming moderate to
fresh tomorrow through midweek as a tropical disturbance builds
and lifts northwest through the area. The increase in winds,
gusts, and wind waves will bring combined seas up by a foot or
two, mainly Tuesday night through Wednesday. Seas may briefly dip
around Thursday, but another pulse of north to northeast swell
will keep sea heights around 5 to 7 feet through the end of the
week. Winds and seas could rise higher by midweek if the
disturbance intensifies more rapidly than expected.

$$

PMZ151>154-132200-
MARIANAS COASTAL WATERS-
523 PM ChST Mon Oct 13 2025

Corrected to include isolated thunderstorms for tonight.

.TONIGHT...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East 4
ft at 8 seconds, north 5 ft at 11 seconds and east 3 ft at 5
seconds. Scattered showers and isolated thunderstorms.
.TUESDAY...East wind 15 to 20 kt. Seas 5 to 7 ft. Wave Detail:
East 4 ft at 9 seconds, north 4 ft at 10 seconds and east 4 ft at
5 seconds. Scattered showers with isolated thunderstorms.
.TUESDAY NIGHT...East wind 15 to 20 kt gusting to 30 kt. Seas 6
to 8 ft. Wave Detail: East 5 ft at 6 seconds, southeast 4 ft at 9
seconds and north 4 ft at 13 seconds. Scattered showers with
isolated thunderstorms. Numerous locally heavy showers for Guam
after midnight.
.WEDNESDAY...Southeast wind 15 to 20 kt with gusts to 30 kt. Seas
6 to 8 ft. Wave Detail: Southeast 5 ft at 6 seconds, east 4 ft at
9 seconds and north 4 ft at 12 seconds. Widespread locally heavy
showers for Guam. Numerous locally heavy showers for CNMI. Isolated
thunderstorms.
.WEDNESDAY NIGHT...East wind 15 to 20 kt with occasional gusts to
30 kt. Seas 5 to 7 ft. Wave Detail: East 4 ft at 8 seconds, east
5 ft at 5 seconds and north 3 ft at 12 seconds. Numerous showers
with isolated thunderstorms. Locally heavy showers possible.
.THURSDAY...East wind 10 to 20 kt. Seas 4 to 6 ft. Wave Detail:
North 4 ft at 13 seconds, east 4 ft at 5 seconds and east 3 ft at
8 seconds. Scattered showers with a slight chance of
thunderstorms.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
North 5 ft at 12 seconds, east 4 ft at 9 seconds and east 3 ft at
4 seconds. A chance of showers with a slight chance of
thunderstorms.
.SATURDAY...East wind 10 to 15 kt. Seas 5 to 6 ft. Wave Detail:
East 4 ft at 9 seconds, north 4 ft at 12 seconds and east 3 ft at
4 seconds. A slight chance of thunderstorms.

$$