103
FZMY50 PGUM 190600
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 PM ChST Wed Nov 19 2025

Marianas Waters out to 40 nautical miles

PMZ150-192030-
400 PM ChST Wed Nov 19 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds are expected throughout the week.
Combined seas of 6 to 8 feet are expected to increase to between
7 and near 10 feet by Friday. With winds near 22 knots and seas
approaching 10 feet, this incoming trade swell will push sea
conditions close to the threshold of a Small Craft Advisory.
Regardless, seas are expected to be very choppy.

$$

PMZ151>154-192030-
MARIANAS COASTAL WATERS-
400 PM ChST Wed Nov 19 2025

...SEAS WILL BEGIN TO APPROACH HAZARDOUS CONDITIONS STARTING
THURSDAY NIGHT...

.TONIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 7 ft at 7 seconds, and east 4 ft at 6 seconds.
.THURSDAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 7 ft at 7 seconds, and east 4 ft at 6 seconds.
.THURSDAY NIGHT...East wind 20 kt. Seas 7 to 9 ft. Wave Detail:
East 8 ft at 7 seconds, and east 4 ft at 6 seconds. Scattered
showers with isolated thunderstorms.
.FRIDAY...East wind 20 kt. Seas 8 to 10 ft. Wave Detail: East
8 ft at 8 seconds, and east 5 ft at 6 seconds and north 3 ft at
12 seconds. Scattered showers with isolated thunderstorms.
.FRIDAY NIGHT...East wind 20 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. Isolated thunderstorms.
.SATURDAY...East wind 20 kt. Seas 8 to 10 ft. Wave Detail: East
8 ft at 8 seconds, east 5 ft at 6 seconds and north 3 ft at 11
seconds. Isolated thunderstorms.
.SUNDAY THROUGH MONDAY...East wind 15 to 20 kt. Seas 7 to 9 ft.
Wave Detail: East 8 ft at 9 seconds and east 5 ft at 6 seconds.

$$