714
FZMY50 PGUM 201836
CWFGUM

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

Marianas Waters out to 40 nautical miles

PMZ150-210800-
436 AM ChST Fri Nov 21 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds will prevail across the region for
the rest of the week. Combined seas of 7 to 9 feet are expected to
increase another foot today and then persist through at least
Saturday, as trade swell, northerly swell, and localized wind
waves remain elevated. Due to conditions becoming hazardous to
small craft, a Small Craft Advisory has been issued beginning this
morning through Saturday afternoon.

$$

PMZ151>154-210800-
MARIANAS COASTAL WATERS-
436 AM ChST Fri Nov 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH
SATURDAY AFTERNOON...

.TODAY...East wind 15 to 25 kt with gusts to 30 kt. Seas 7 to 10 ft.
Wave Detail: East 8 ft at 9 seconds, east 6 ft at 6 seconds and
north 3 ft at 12 seconds. Isolated thunderstorms.
.TONIGHT...East wind 15 to 20 kt with 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. Isolated thunderstorms.
.SATURDAY...East wind 15 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 8 to 9 ft. Wave
Detail: East 8 ft at 9 seconds and east 4 ft at 6 seconds.
Scattered showers.
.SUNDAY THROUGH MONDAY...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.
.TUESDAY...East wind 10 to 20 kt. Seas 7 to 9 ft. Wave Detail:
North 8 ft at 10 seconds and east 4 ft at 5 seconds.

$$