388
FZMY50 PGUM 160518
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
318 PM ChST Sun Nov 16 2025

Marianas Waters out to 40 nautical miles

PMZ150-162100-
318 PM ChST Sun Nov 16 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 Monday
night, then begin to 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, potentially becoming hazardous to
small craft.

$$

PMZ151>154-162100-
MARIANAS COASTAL WATERS-
318 PM ChST Sun Nov 16 2025

.TONIGHT...East wind 15 to 20 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 9 seconds and east 4 ft at 6 seconds.
.MONDAY THROUGH TUESDAY NIGHT...East wind 15 to 20 kt. Seas 5 to
7 ft. Wave Detail: East 6 ft at 8 seconds and east 4 ft at 5
seconds.
.WEDNESDAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 7 ft at 8 seconds and east 4 ft at 6 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. A chance of
showers with a slight chance of thunderstorms.
.FRIDAY...East wind 15 to 20 kt with occasional gusts to 30 kt.
Seas 8 to 10 ft. Wave Detail: Northeast 8 ft at 9 seconds, east 5
ft at 6 seconds and north 3 ft at 11 seconds. A chance of showers
with a slight chance of thunderstorms.

$$