680
FZMY50 PGUM 261750
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
Issued by National Weather Service Honolulu HI
350 AM ChST Fri Jun 27 2025

Marianas Waters out to 40 nautical miles

PMZ150-270915-
350 AM ChST Fri Jun 27 2025

.Synopsis for Marianas Waters...A gentler south to southeast flow
will prevail across the Marianas through Saturday as Invest 97W,
centered west of the Marianas, shifts further away. Combined seas
of 4 to 6 feet for Guam and Rota, and 5 to 7 feet for Tinian and
Saipan, look to build late weekend into early next week as a
monsoon swell begins to build into the region. This looks to be in
response to another possible disturbance developing east of the
Marianas, leading to a moderate to fresh monsoon flow.

$$

PMZ151-152-270915-
Guam Coastal Waters-Rota Coastal Waters-
350 AM ChST Fri Jun 27 2025

.TODAY...Southeast wind 5 to 10 kt. Seas 3 to 6 ft. Wave Detail:
East 4 ft at 8 seconds and southwest 2 ft at 4 seconds. Scattered
showers with isolated thunderstorms.
.TONIGHT...Southeast wind 5 to 10 kt. Seas 4 to 6 ft. Wave
Detail: East 4 ft at 8 seconds and southwest 3 ft at 5 seconds.
Scattered showers with isolated thunderstorms.
.SATURDAY...South wind 5 to 15 kt. Seas 4 to 6 ft. Wave Detail:
Southwest 5 ft at 6 seconds and east 4 ft at 8 seconds. Numerous
showers with isolated thunderstorms. Locally heavy downpours
possible.
.SUNDAY...Southwest wind 10 to 15 kt. Seas 6 to 7 ft. Wave
Detail: Southwest 5 ft at 7 seconds and east 3 ft at 8 seconds.
Showers likely with a slight chance of thunderstorms. Locally
heavy downpours possible.
.MONDAY THROUGH TUESDAY...Southwest wind 10 to 20 kt. Seas 5 to 7
ft. Southwest 7 ft at 8 seconds A chance of showers with a slight
chance of thunderstorms.

$$

PMZ153-154-270915-
Tinian Coastal Waters-Saipan Coastal Waters-
350 AM ChST Fri Jun 27 2025

.TODAY...Southeast wind 10 kt. Seas 5 to 7 ft. Wave Detail: East
6 ft at 8 seconds and southeast 2 ft at 4 seconds. Scattered
showers with isolated thunderstorms.
.TONIGHT...Southeast wind 5 to 10 kt. Seas 5 to 7 ft. Wave
Detail: East 6 ft at 8 seconds and south 2 ft at 4 seconds.
Scattered showers with isolated thunderstorms.
.SATURDAY...Southeast wind 10 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 8 seconds and south 2 ft at 4 seconds. Scattered
showers with isolated thunderstorms. Locally heavy downpours
possible.
.SUNDAY...South wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail:
South 5 ft at 7 seconds and east 3 ft at 8 seconds. A chance of
showers with a slight chance of thunderstorms. Locally heavy
downpours possible.
.MONDAY THROUGH TUESDAY...Southwest wind 10 to 20 kt. Seas 6 to 8
ft. Southwest 6 ft at 8 seconds. A chance of showers with a
slight chance of thunderstorms.

$$