686
FZMY50 PGUM 200529 CCA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...CORRECTED
National Weather Service Tiyan GU
329 PM ChST Wed Aug 20 2025

Marianas Waters out to 40 nautical miles

PMZ150-202200-
329 PM ChST Wed Aug 20 2025

.Synopsis for Marianas Waters...Convergence in front of a trade-
wind trough is expected to bring scattered showers starting for
Guam tonight, then expand farther north into the CNMI Thursday
night and Friday. Combined seas of 3 to 4 feet and light to gentle
winds are expected through the weekend. Easterly trades look to
increase to gentle to moderate early next week.

$$

PMZ151-152-202200-
Guam Coastal Waters-Rota Coastal Waters-
329 PM ChST Wed Aug 20 2025

.TONIGHT...Northeast wind 10 kt. Seas 3 to 4 ft. Wave Detail:
East 4 ft at 8 seconds and northeast 2 ft at 4 seconds. Isolated
thunderstorms. Scattered showers over Guam waters and southern
Rota waters.
.THURSDAY...Northeast wind 10 kt. Seas 3 to 4 ft. Wave Detail:
East 3 ft at 8 seconds and northeast 2 ft at 4 seconds. Isolated
thunderstorms. Scattered showers over Guam waters.
.THURSDAY NIGHT AND FRIDAY...East wind 10 kt. Seas 3 to 4 ft.
Wave Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.FRIDAY NIGHT...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.
Isolated thunderstorms.
.SATURDAY THROUGH SUNDAY...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. A slight chance of thunderstorms.
.MONDAY...East wind 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
East 3 ft at 8 seconds and east 3 ft at 6 seconds. A chance of
showers with a slight chance of thunderstorms.

$$

PMZ153-154-202200-
Tinian Coastal Waters-Saipan Coastal Waters-
329 PM ChST Wed Aug 20 2025

.TONIGHT...Northeast wind 10 kt. Seas 3 to 4 ft. Wave Detail:
East 3 ft at 8 seconds and east 2 ft at 4 seconds. Isolated
thunderstorms.
.THURSDAY AND THURSDAY NIGHT...Northeast to east wind 10 kt. Seas
3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and northeast 2 ft
at 4 seconds. Isolated thunderstorms.
.FRIDAY...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East
3 ft at 8 seconds and east 2 ft at 4 seconds. Scattered showers
with isolated thunderstorms.
.FRIDAY NIGHT...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.
Isolated thunderstorms.
.SATURDAY THROUGH SUNDAY...East wind 10 kt. Seas around 3 ft.
Wave Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds.
A slight chance of thunderstorms.
.MONDAY...East wind 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
East 3 ft at 8 seconds and east 3 ft at 6 seconds. A chance of
showers with a slight chance of thunderstorms.

$$