691
FZMY50 PGUM 191811 CCA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...CORRECTED
National Weather Service Tiyan GU
411 AM ChST Thu Nov 20 2025

Marianas Waters out to 40 nautical miles

PMZ150-201000-
411 AM ChST Thu Nov 20 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds will prevail across the region for
much of the week. Combined seas of 6 to 8 feet will increase over
the next days, likely becoming hazardous to small craft beginning
Friday, as easterly swell continues to strengthen and a northerly
swell mixes in.

$$

PMZ151>154-201000-
MARIANAS COASTAL WATERS-
411 AM ChST Thu Nov 20 2025

Corrected typo in tonight`s forecast.

...SEAS APPROACHING LEVELS HAZARDOUS TO SMALL CRAFT BEGINNING
THURSDAY NIGHT...

.TODAY...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.
.TONIGHT...East wind 20 kt. Seas 7 to 9 ft. Wave Detail:
East 8 ft at 8 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, 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:
East 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.

$$