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FZMY50 PGUM 302303 AAA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...UPDATED
National Weather Service Tiyan GU
903 AM ChST Mon Dec 1 2025

Marianas Waters out to 40 nautical miles

PMZ150-010800-
903 AM ChST Mon Dec 1 2025

.Synopsis for Marianas Waters...
Moderate to fresh trades will prevail across the region through
Wednesday, as a tropical disturbance is expected to maintain
scattered showers and isolated thunderstorms through tonight,
mainly across Guam and Rota. Combined seas of 7 to 9 feet are
expected through Wednesday as northerly swell moves through the
region, generated by a distant low pressure system. Afterwards,
conditions gradually subside to gentle to moderate winds and 5 to
7 foot seas late week.

$$

PMZ151-152-010800-
Guam Coastal Waters-Rota Coastal Waters-
903 AM ChST Mon Dec 1 2025

Updated to include isolated thunderstorms today.

.TODAY...East wind 15 to 20 kt. Seas 7 to 8 ft. Wave Detail: East
5 ft at 8 seconds, northeast 4 ft at 14 seconds and east 4 ft at
5 seconds. Scattered showers becoming numerous around noon.
Isolated thunderstorms.
.TONIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail:
East 6 ft at 8 seconds, northeast 5 ft at 13 seconds and east 4 ft
at 6 seconds. Scattered showers with isolated thunderstorms.
.TUESDAY AND TUESDAY NIGHT...East wind 15 to 20 kt. Seas 7 to 9
ft. Wave Detail: East 6 ft at 8 seconds, northeast 5 ft at 13
seconds and east 4 ft at 6 seconds.
.WEDNESDAY...East wind 15 kt. Seas 7 to 9 ft. Wave Detail: East
7 ft at 8 seconds, east 3 ft at 6 seconds and northeast 3 ft at
13 seconds. A chance of showers.
.THURSDAY...East wind 10 to 15 kt. Seas 6 to 8 ft. Wave Detail:
East 6 ft at 8 seconds, east 3 ft at 5 seconds and northeast 3 ft
at 13 seconds. A chance of showers with a slight chance of
thunderstorms.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 8 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds. A chance of showers.

$$

PMZ153-154-010800-
Tinian Coastal Waters-Saipan Coastal Waters-
903 AM ChST Mon Dec 1 2025

Updated to include isolated thunderstorms today.

.REST OF TODAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 6 ft at 8 seconds, northeast 5 ft at 14 seconds and
east 4 ft at 5 seconds. Scattered showers and isolated
thunderstorms.
.TONIGHT THROUGH TUESDAY NIGHT...East wind 15 to 20 kt. Seas
7 to 9 ft. Wave Detail: East 6 ft at 8 seconds, northeast 5 ft at
13 seconds and east 4 ft at 6 seconds.
.WEDNESDAY...Southeast wind 15 kt. Seas 7 to 9 ft. Wave Detail:
East 7 ft at 8 seconds, northeast 4 ft at 13 seconds and
southeast 3 ft at 5 seconds.
.THURSDAY...East wind 10 to 15 kt. Seas 6 to 8 ft. Wave Detail:
East 6 ft at 8 seconds, east 3 ft at 5 seconds and northeast 3 ft
at 13 seconds. A chance of showers.
.FRIDAY...East wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail:
East 5 ft at 8 seconds, east 3 ft at 4 seconds and northeast 3 ft
at 13 seconds.

$$