FZMY50 PGUM 191827
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
427 AM ChST Wed May 20 2026

Marianas Waters out to 40 nautical miles

PMZ150-200815-
427 AM ChST Wed May 20 2026

.Synopsis for Marianas Waters...
Moderate to fresh easterlies will prevail across the region
through the rest of the week, possibly dropping to moderate over 
the weekend. Combined seas are expected to remain between 6 and 8 
feet before tapering down a foot or two starting around Thursday 
afternoon.

$$

PMZ151>154-200815-
MARIANAS COASTAL WATERS-
427 AM ChST Wed May 20 2026

.TODAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail: East
6 ft at 8 seconds and east 4 ft at 6 seconds. 
.TONIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 6 ft at 8 seconds and east 4 ft at 6 seconds. 
.THURSDAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 6 ft at 8 seconds and east 3 ft at 6 seconds. 
.THURSDAY NIGHT...East wind 15 kt. Seas 5 to 7 ft. Wave Detail:
East 6 ft at 8 seconds and east 3 ft at 5 seconds. Scattered
showers. 
.FRIDAY...East wind 15 kt. Seas 5 to 7 ft. Wave Detail: East 6 ft
at 8 seconds and east 3 ft at 5 seconds. A chance of showers. 
.SATURDAY AND SUNDAY...East wind 10 to 20 kt. Seas 4 to 6 ft.
Wave Detail: East 5 ft at 8 seconds and east 3 ft at 5 seconds. A
chance of showers with a slight chance of thunderstorms.  

$$