323
FZMY50 PGUM 280648
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
448 PM ChST Thu Aug 28 2025

Marianas Waters out to 40 nautical miles

PMZ150-282200-
448 PM ChST Thu Aug 28 2025

.Synopsis for Marianas Waters...Moderate convergence in the
trade-wind pattern will keep scattered showers, to at times
isolated, through Friday. Then, an increase in convergence and
moisture ahead of a surface trough will trend towards a wetter
pattern for the region starting Friday night and through the
weekend. Gentle to moderate easterly trades, become light to
moderate southerlies over the weekend, as the trough passes
through. Combined seas of 3 to 5 feet are expected to continue
this week.

$$

PMZ151>154-282200-
MARIANAS COASTAL WATERS-
448 PM ChST Thu Aug 28 2025

.TONIGHT...East wind 10 to 15 kt. Seas around 4 ft. Wave Detail:
East 3 ft at 8 seconds and east 3 ft at 4 seconds. Isolated
thunderstorms. Evening scattered showers.
.FRIDAY AND FRIDAY NIGHT...East wind 10 to 15 kt. Seas 4 to 5 ft.
Wave Detail: East 4 ft at 8 seconds and east 3 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SATURDAY...Southeast wind 5 to 15 kt. Seas 4 to 5 ft. Wave
Detail: East 4 ft at 8 seconds and southeast 3 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SATURDAY NIGHT...South wind 5 to 15 kt. Seas around 5 ft. Wave
Detail: Southeast 4 ft at 8 seconds and south 3 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SUNDAY...South wind 5 to 15 kt. Seas around 5 ft. Wave Detail:
East 4 ft at 8 seconds and south 3 ft at 4 seconds. Numerous
showers through the afternoon, then a chance of showers through
the night. A slight chance of thunderstorms.
.MONDAY AND TUESDAY...East wind 5 to 15 kt. Seas 3 to 5 ft. Wave
Detail: East 4 ft at 8 seconds and east 3 ft at 4 seconds. A
chance of showers with a slight chance of thunderstorms.

$$