584
FZMY50 PGUM 040600
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 PM ChST Thu Dec 4 2025

Marianas Waters out to 40 nautical miles

PMZ150-042145-
400 PM ChST Thu Dec 4 2025

.Synopsis for Marianas Waters...
Seas are around 5 to 7 feet, supported by the elevated trade swell
and slowly subsiding longer-period north swell, with gentle to
moderate winds across the region. Another pulse of northerly swell
this weekend, along with a slight increase in the trade swell will
help to push seas up to 6 to 8 feet around Saturday. A weak
trough is expected to pass near or just south of the Marianas
tonight and Friday. The greatest potential for scattered
showers and isolated thunderstorms will be across Guam and Rota
coastal waters.

$$

PMZ151-152-042145-
Guam Coastal Waters-Rota Coastal Waters-
400 PM ChST Thu Dec 4 2025

.TONIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 11 seconds. Scattered showers with isolated thunderstorms.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, east 3 ft at 5 seconds and northeast 3 ft
at 11 seconds. Scattered showers.
.FRIDAY NIGHT...East wind 10 to 15 kt. Seas 5 to 6 ft. Wave
Detail: East 4 ft at 9 seconds, northeast 3 ft at 11 seconds and
east 3 ft at 4 seconds.
.SATURDAY...East wind 10 kt. Seas 6 to 7 ft. Wave Detail:
Northeast 6 ft at 10 seconds, northeast 3 ft at 11 seconds and
east 2 ft at 4 seconds.
.SATURDAY NIGHT...East wind 10 to 15 kt. Seas 6 to 7 ft. Wave
Detail: Northeast 6 ft at 10 seconds, north 3 ft at 11 seconds
and east 3 ft at 4 seconds.
.SUNDAY THROUGH TUESDAY...East wind 10 to 15 kt. Seas 6 to 7 ft.
Wave Detail: Northeast 6 ft at 10 seconds, east 3 ft at 4 seconds
and north 3 ft at 10 seconds.

$$

PMZ153-154-042145-
Tinian Coastal Waters-Saipan Coastal Waters-
400 PM ChST Thu Dec 4 2025

.TONIGHT...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, northeast 3 ft at 11 seconds and east
3 ft at 4 seconds.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 9 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 11 seconds.
.FRIDAY NIGHT...East wind 10 kt. Seas 5 to 6 ft. Wave Detail:
Northeast 5 ft at 10 seconds, northeast 3 ft at 11 seconds and
southeast 2 ft at 4 seconds.
.SATURDAY...East wind 10 kt. Seas 5 to 7 ft. Wave Detail:
Northeast 6 ft at 10 seconds, north 3 ft at 11 seconds and east
2 ft at 4 seconds.
.SATURDAY NIGHT...East wind 10 to 15 kt. Seas 5 to 6 ft. Wave
Detail: Northeast 5 ft at 10 seconds, north 3 ft at 11 seconds
and east 2 ft at 4 seconds.
.SUNDAY THROUGH TUESDAY...East wind 5 to 15 kt. Seas 5 to 7 ft.
Wave Detail: Northeast 6 ft at 10 seconds, north 3 ft at 11
seconds and east 2 ft at 4 seconds.

$$