451
FZMY50 PGUM 210652
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
452 PM ChST Fri Nov 21 2025

Marianas Waters out to 40 nautical miles

PMZ150-212030-
452 PM ChST Fri Nov 21 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds will prevail across the region through
at least the middle of next week. Combined seas of 7 to 10 feet
are expected to persist through at least Saturday, as trade swell,
northerly swell, and localized wind waves remain elevated. Due to
conditions being hazardous to small craft, a Small Craft Advisory
remains in effect through Saturday afternoon.

$$

PMZ151>154-212030-
MARIANAS COASTAL WATERS-
452 PM ChST Fri Nov 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY AFTERNOON...

.TONIGHT...East wind 15 to 25 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. Scattered showers developing for Guam. Isolated
thunderstorms.
.SATURDAY...East wind 20 to 25 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. Scattered showers with isolated thunderstorms.
.SATURDAY NIGHT...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.
.SUNDAY...East wind 20 kt. Seas 7 to 9 ft. Wave Detail: East 8 ft
at 9 seconds and east 4 ft at 6 seconds.
.SUNDAY NIGHT...East wind 20 kt. Seas 7 to 9 ft. Wave Detail:
East 8 ft at 9 seconds and east 4 ft at 6 seconds.
.MONDAY AND TUESDAY...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.
.WEDNESDAY...East wind 15 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 7 ft at 9 seconds and east 3 ft at 5 seconds.

$$