379
FZMY50 PGUM 170716
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
516 PM ChST Fri Jul 17 2026

Marianas Waters out to 40 nautical miles

PMZ150-172200-
516 PM ChST Fri Jul 17 2026

.Synopsis for Marianas Waters...
Gentle to moderate southwesterlies will prevail across the Marianas
tonight, before tapering down thereafter. Island showers may
develop Saturday and Sunday during the afternoon hours. Isolated
thunderstorms are possible during Saturday`s island effect
showers. Combined seas of 4 to 5 feet will taper down to around 3
to 4 feet by Saturday night, remaining for a day or two before
possibly building by a foot or so around the middle of next week.

$$

PMZ151>154-172200-
MARIANAS COASTAL WATERS-
516 PM ChST Fri Jul 17 2026

.TONIGHT...West wind 10 to 15 kt. Seas 4 to 5 ft. Wave Detail:
West 4 ft at 8 seconds, west 3 ft at 4 seconds and east 2 ft at
9 seconds. Scattered showers and isolated thunderstorms.
.SATURDAY...Southwest wind 5 to 10 kt. Seas around 4 ft. Wave
Detail: West 3 ft at 8 seconds, southwest 2 ft at 4 seconds and
east 2 ft at 9 seconds. Isolated thunderstorms.
.SATURDAY NIGHT...Southwest wind 10 kt. Seas around 4 ft. Wave
Detail: Southwest 2 ft at 4 seconds, west 2 ft at 8 seconds and
east 2 ft at 9 seconds. Scattered showers.
.SUNDAY...Southwest wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail:
Southwest 2 ft at 4 seconds, west 2 ft at 8 seconds and east 2 ft
at 9 seconds.
.SUNDAY NIGHT...South wind 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: Southwest 2 ft at 8 seconds, south 2 ft at 4 seconds and
east 2 ft at 9 seconds.
.MONDAY...South wind 5 kt. Seas around 3 ft. Wave Detail:
Southwest 3 ft at 8 seconds and east 2 ft at 9 seconds.
.TUESDAY AND WEDNESDAY...West wind 10 kt. Seas 3 to 5 ft.
Wave Detail: South 4 ft at 9 seconds, and west 2 ft at 4 seconds.
A chance of showers with a slight chance of thunderstorms.

$$