417
FZMY50 PGUM 120710
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
510 PM ChST Thu Mar 12 2026

Marianas Waters out to 40 nautical miles

PMZ150-122100-
510 PM ChST Thu Mar 12 2026

.Synopsis for Marianas Waters...
Tropical Depression Nuri (03W), well west-southwest of the
Marianas, is gradually moving northeast and expected to dissipate
over the next 24 hours. A strong active shear line is found over
the northern CNMI. This feature, along with a strong mid-latitude
system will be the primary features affecting marine conditions
through the next several days. Combined seas of 6 to 8 feet are
expected to increase significantly by Friday, as a secondary
northerly swell and tertiary southwesterly swell mix in. This will
produce seas hazardous to small craft beginning Friday morning.

$$

PMZ151-152-122100-
Guam Coastal Waters-Rota Coastal Waters-
510 PM ChST Thu Mar 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM EARLY FRIDAY MORNING
THROUGH EARLY MONDAY MORNING...

.TONIGHT...South wind 10 to 20 kt. Seas 6 to 8 ft. Wave Detail:
Northeast 7 ft at 11 seconds, south 3 ft at 5 seconds, southwest
3 ft at 8 seconds and north 3 ft at 9 seconds. Scattered showers
with isolated thunderstorms.
.FRIDAY...Southwest wind 15 to 20 kt. Seas 8 to 9 ft. Wave Detail:
Northeast 7 ft at 12 seconds, southwest 4 ft at 6 seconds,
southwest 3 ft at 8 seconds and north 3 ft at 9 seconds. Numerous
locally heavy showers with isolated thunderstorms.
.FRIDAY NIGHT...Southwest wind 10 to 15 kt. Seas 8 to 10 ft. Wave
Detail: Northeast 8 ft at 11 seconds, north 4 ft at 9 seconds,
southwest 3 ft at 4 seconds and southwest 3 ft at 8 seconds.
Scattered showers with isolated thunderstorms.
.SATURDAY...Northwest wind 10 to 15 kt. Seas 8 to 10 ft. Wave
Detail: Northeast 8 ft at 13 seconds, north 4 ft at 9 seconds,
southwest 3 ft at 8 seconds and northwest 2 ft at 4 seconds.
Scattered showers.
.SATURDAY NIGHT...North wind 15 kt. Seas 8 to 10 ft. Wave Detail:
Northeast 8 ft at 13 seconds, north 4 ft at 9 seconds, north 3 ft
at 5 seconds and southwest 2 ft at 8 seconds.
.SUNDAY AND MONDAY...Northeast wind 10 to 15 kt. Seas 9 to
12 ft. Wave Detail: North 10 ft at 12 seconds, northeast 5 ft at
9 seconds, north 3 ft at 5 seconds and southwest 2 ft at
8 seconds.
.TUESDAY...Northeast wind 15 to 20 kt. Seas 8 to 10 ft. Wave
Detail: North 7 ft at 12 seconds, northeast 5 ft at 9 seconds,
northeast 4 ft at 6 seconds and southwest 2 ft at 8 seconds.

$$

PMZ153-154-122100-
Tinian Coastal Waters-Saipan Coastal Waters-
510 PM ChST Thu Mar 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM EARLY FRIDAY MORNING
THROUGH EARLY MONDAY MORNING...

.TONIGHT...South wind 10 to 15 kt. Seas 7 to 9 ft. Wave Detail:
Northeast 7 ft at 11 seconds, south 3 ft at 4 seconds, southwest
3 ft at 8 seconds and north 3 ft at 9 seconds. Isolated
thunderstorms. Scattered showers this evening, then numerous
locally heavy showers after midnight.
.FRIDAY...Southwest wind 15 to 20 kt. Seas 8 to 10 ft. Wave Detail:
Northeast 8 ft at 12 seconds, southwest 3 ft at 5 seconds,
southwest 3 ft at 8 seconds and north 3 ft at 9 seconds. Numerous
locally heavy showers with isolated thunderstorms.
.FRIDAY NIGHT...Southwest wind 10 to 15 kt. Seas 8 to 10 ft. Wave
Detail: Northeast 8 ft at 12 seconds, north 4 ft at 9 seconds,
southwest 3 ft at 4 seconds and southwest 3 ft at 8 seconds.
Scattered showers with isolated thunderstorms.
.SATURDAY...Northwest wind 10 to 15 kt. Seas 8 to 10 ft. Wave
Detail: Northeast 8 ft at 13 seconds, north 4 ft at 9 seconds,
northwest 3 ft at 4 seconds and southwest 3 ft at 8 seconds.
Scattered showers.
.SATURDAY NIGHT...North wind 15 kt. Seas 9 to 11 ft. Wave Detail:
Northeast 9 ft at 13 seconds, north 4 ft at 9 seconds, north 3 ft
at 5 seconds and southwest 2 ft at 8 seconds.
.SUNDAY THROUGH TUESDAY...Northeast wind 10 to 20 kt. Seas 9 to
12 ft. Wave Detail: North 11 ft at 12 seconds, northeast 5 ft at
9 seconds, northeast 4 ft at 6 seconds and southwest 2 ft at
8 seconds.

$$