278
FZMY50 PGUM 220135
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
1135 AM ChST Fri Aug 22 2025

Marianas Waters out to 40 nautical miles

PMZ150-220830-
1135 AM ChST Fri Aug 22 2025

.Synopsis for Marianas Waters...A trade-wind trough is moving
through the Marianas, bringing numerous showers and isolated
thunderstorms through tonight. Combined seas of 3 to 4 feet and
light to gentle winds are expected over the next few days,
increasing to 3 to 5 foot seas and gentle to moderate trades next
week.

$$

PMZ151>154-220830-
MARIANAS COASTAL WATERS-
1135 AM ChST Fri Aug 22 2025

Update chance of showers to numerous for today and tonight.

.THIS AFTERNOON...East wind 5 to 10 kt. Seas around 3 ft. Wave
Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds.
Numerous showers and isolated thunderstorms.
.TONIGHT...East wind 5 to 10 kt. Seas around 3 ft. Wave Detail:
East 3 ft at 8 seconds. Numerous showers with isolated
thunderstorms.
.SATURDAY...East wind 5 to 10 kt. Seas around 3 ft. Wave Detail:
East 3 ft at 8 seconds. Scattered showers with isolated
thunderstorms.
.SATURDAY NIGHT...East wind 5 to 10 kt. Seas around 3 ft. Wave
Detail: East 2 ft at 4 seconds and east 2 ft at 8 seconds.
Isolated thunderstorms.
.SUNDAY...East wind 10 to 15 kt. Seas around 3 ft. Wave Detail:
East 2 ft at 4 seconds and east 2 ft at 8 seconds. A slight
chance of thunderstorms.
.MONDAY AND TUESDAY...Southeast wind 10 to 15 kt. Seas 3 to 5 ft.
Wave Detail: East 3 ft at 4 seconds and east 3 ft at 8 seconds. A
chance of showers with a slight chance of thunderstorms.

$$