957
FZMY50 PGUM 101828
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
428 AM ChST Thu Dec 11 2025

Marianas Waters out to 40 nautical miles

PMZ150-110815-
428 AM ChST Thu Dec 11 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds with occasional strong gusts are
expected through Sunday. A shearline is moving through the Far
Northern CNMI and is expected to move over or just north of Saipan
and Tinian by tonight. Overall combined seas of 6 to 7 feet are
expected to increase by a foot or two for Guam and Rota and seas
near Tinian and Saipan could rise to near 11 feet over the weekend.

$$

PMZ151-152-110815-
Guam Coastal Waters-Rota Coastal Waters-
428 AM ChST Thu Dec 11 2025

.TODAY...East wind 15 kt with gusts to 25 kt. Seas 6 to 8 ft.
Wave Detail: East 5 ft at 9 seconds, northeast 4 ft at 10 seconds
and east 3 ft at 5 seconds.
.TONIGHT...East wind 10 to 15 kt. Seas 6 to 7 ft. Wave Detail:
Northeast 6 ft at 9 seconds and east 3 ft at 5 seconds.
.FRIDAY...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: Northeast
6 ft at 8 seconds and east 3 ft at 5 seconds.
.FRIDAY NIGHT...Northeast wind 15 to 20 kt. Seas 6 to 7 ft. Wave
Detail: Northeast 6 ft at 9 seconds and east 3 ft at 6 seconds.
.SATURDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail:
Northeast 8 ft at 9 seconds and east 5 ft at 6 seconds.
.SUNDAY...East wind 15 to 20 kt. Seas 8 to 10 ft. Wave Detail:
Northeast 9 ft at 9 seconds and east 4 ft at 6 seconds.
.MONDAY...East wind 10 to 15 kt. Seas 7 to 9 ft. Wave Detail:
Northeast 8 ft at 10 seconds and east 3 ft at 4 seconds.

$$

PMZ153-154-110815-
Tinian Coastal Waters-Saipan Coastal Waters-
428 AM ChST Thu Dec 11 2025

.TODAY...East wind 15 kt with gusts to 25 kt. Seas 6 to 8 ft.
Wave Detail: East 6 ft at 9 seconds, northeast 4 ft at 10 seconds
and east 3 ft at 5 seconds.
.TONIGHT...East wind 15 to 20 kt. Seas 6 to 7 ft. Wave Detail:
Northeast 6 ft at 8 seconds and east 3 ft at 5 seconds.
.FRIDAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 6 ft at 8 seconds and east 3 ft at 5 seconds.
.FRIDAY NIGHT...Northeast wind 15 to 20 kt. Seas 6 to 8 ft. Wave
Detail: Northeast 6 ft at 9 seconds and northeast 4 ft at
6 seconds.
.SATURDAY AND SUNDAY...East wind 15 to 20 kt. Seas 9 to 11 ft.
Wave Detail: Northeast 10 ft at 8 seconds.
.MONDAY...East wind 10 to 15 kt. Seas 7 to 9 ft. Wave Detail:
Northeast 9 ft at 10 seconds and east 3 ft at 4 seconds.

$$