944
FZMY50 PGUM 170537
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
337 PM ChST Tue Jun 17 2025

Marianas Waters out to 40 nautical miles

PMZ150-172000-
337 PM ChST Tue Jun 17 2025

.Synopsis for Marianas Waters...Gentle winds will become moderate
on Wednesday, then ease up again by the weekend. Combined seas of
3 feet will build to between 3 and 5 feet Thursday. A surface
trough is moving west from near Guam and will allow for scattered
showers near Guam and Rota tonight to become isolated Wednesday.
Isolated thunderstorms will persist through Wednesday night near
Guam and Rota.

$$

PMZ151-152-172000-
Guam Coastal Waters-Rota Coastal Waters-
337 PM ChST Tue Jun 17 2025

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

$$

PMZ153-154-172000-
Tinian Coastal Waters-Saipan Coastal Waters-
337 PM ChST Tue Jun 17 2025

.TONIGHT...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.
.WEDNESDAY...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.
.WEDNESDAY 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.
.THURSDAY...East wind 10 to 15 kt. Seas 3 to 5 ft. Wave Detail:
East 4 ft at 8 seconds and east 3 ft at 4 seconds.
.THURSDAY NIGHT...East wind 10 kt. Seas 3 to 5 ft. Wave Detail:
East 4 ft at 8 seconds and east 2 ft at 4 seconds.
.FRIDAY THROUGH SUNDAY...East wind 5 to 10 kt. Seas 3 to 4 ft.
Wave Detail: East 4 ft at 8 seconds and east 2 ft at 4 seconds.

$$