549
FZMY50 PGUM 032109 AAA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...UPDATED
National Weather Service Tiyan GU
709 AM ChST Sat Oct 4 2025

Marianas Waters out to 40 nautical miles

PMZ150-040900-
709 AM ChST Sat Oct 4 2025

.Synopsis for Marianas Waters...Combined seas of 2 to 4 feet and
light to gentle winds are expected through at least Wednesday. An
approaching TUTT cell will increase the risk of thunderstorms over
the waters over the next couple of days. Island heating could give
rise to thunderstorms near Guam for Sunday afternoon. Converging
inflow into Invest 94W is generating scattered showers and
isolated thunderstorms across the waters today.

$$

PMZ151>154-040900-
MARIANAS COASTAL WATERS-
709 AM ChST Sat Oct 4 2025

Updated for increased showers across the waters today

.REST OF TODAY...Southwest wind 5 kt. Seas 3 to 4 ft. Wave Detail:
Northeast 3 ft at 8 seconds. Scattered showers with isolated
thunderstorms.
.TONIGHT AND SUNDAY...Southwest wind 5 kt. Seas around 3 ft. Wave
Detail: Northeast 3 ft at 8 seconds. Isolated thunderstorms.
.SUNDAY NIGHT...South wind 5 kt. Seas around 3 ft. Wave Detail:
East 3 ft at 8 seconds. Scattered showers with isolated
thunderstorms.
.MONDAY AND TUESDAY...South wind 10 kt. Seas 3 to 4 ft. Wave
Detail: East 3 ft at 8 seconds and southeast 2 ft at 4 seconds. A
chance of showers with a slight chance of thunderstorms.
.WEDNESDAY...East wind 5 to 10 kt. Seas around 3 ft. Wave Detail:
East 3 ft at 8 seconds. A slight chance of thunderstorms.

$$