128
FZMY50 PGUM 170600
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 PM ChST Mon Nov 17 2025

Marianas Waters out to 40 nautical miles

PMZ150-172130-
400 PM ChST Mon Nov 17 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds are expected throughout the week.
Combined seas of 5 to 7 feet will remain steady through tonight,
then begin to gradually increase as the trade swell builds,
potentially reaching 7 to 9 feet by Thursday night. Seas and winds
could increase further on Friday into the weekend as a trade wind
surge builds across the region, may become hazardous to small
craft.

$$

PMZ151>154-172130-
MARIANAS COASTAL WATERS-
400 PM ChST Mon Nov 17 2025

.TONIGHT...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East
6 ft at 8 seconds and east 3 ft at 5 seconds.
.TUESDAY...East wind 15 kt. Seas 6 to 7 ft. Wave Detail:
Northeast 6 ft at 8 seconds and east 3 ft at 5 seconds.
.TUESDAY NIGHT...East wind 15 kt. Seas 6 to 7 ft. Wave Detail:
East 6 ft at 8 seconds and east 3 ft at 5 seconds.
.WEDNESDAY...East wind 15 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 7 ft at 8 seconds and east 3 ft at 5 seconds.
.WEDNESDAY NIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave
Detail: East 7 ft at 8 seconds and east 4 ft at 5 seconds.
.THURSDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail:
East 8 ft at 9 seconds and east 4 ft at 6 seconds.
.FRIDAY AND SATURDAY...East wind 15 to 20 kt. Seas 7 to 9 ft.
Wave Detail: East 8 ft at 9 seconds, east 4 ft at 4 seconds and
north 3 ft at 11 seconds. A chance of showers.

$$