246
FZMY50 PGUM 191802
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
402 AM ChST Wed Aug 20 2025

Marianas Waters out to 40 nautical miles

PMZ150-200930-
402 AM ChST Wed Aug 20 2025

.Synopsis for Marianas Waters...A trade-wind trough will give Guam
and Rota scattered showers starting Thursday, spreading to Tinian
and Saipan Waters Friday. Combined seas of 3 to 5 feet and light
to gentle winds are expected through the weekend.

$$

PMZ151>154-200930-
MARIANAS COASTAL WATERS-
402 AM ChST Wed Aug 20 2025

.TODAY...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East
4 ft at 8 seconds. Isolated thunderstorms.
.TONIGHT...East 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...East 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. Scattered showers Guam and Rota Waters.
.FRIDAY THROUGH SUNDAY...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. A
chance of showers through Saturday. A slight chance of
thunderstorms.

$$