Coastal Waters Forecast
Issued by NWS Tiyan, Guam

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FZMY50 PGUM 161042 AAA
CWFGUM

Coastal Waters Forecast for the Mariana Islands...UPDATED
National Weather Service Tiyan GU
842 PM ChST Tue Aug 16 2022

Marianas Waters out to 40 nautical miles

PMZ150-162100-
842 PM ChST Tue Aug 16 2022

Updated for increasing showers and thunderstorms this evening for
Tinian and Saipan

.Synopsis for Marianas Waters...Moderate east winds are expected
through tonight. Winds are expected to become southeasterly
Wednesday and then southerly while diminishing Wednesday night as a
disturbance passes to the southwest. This disturbance will bring
increasing showers and thunderstorms, mainly to Guam and Rota
through Wednesday evening, some of which could bring gusts up to
30 kt. Combined seas of 4 to 5 feet will increase to between 4 and
6 feet Wednesday, possibly reaching up to 7 feet in Guam waters,
before finally subsiding to between 3 and 4 feet by Thursday
evening.

$$

PMZ151-152-162100-
Guam Coastal Waters-Rota Coastal Waters-
842 PM ChST Tue Aug 16 2022

.TONIGHT...East wind 10 to 20 kt. Gusts to 30 kt with showers. Wind
waves 2 to 4 ft. East swell 4 to 6 ft. Isolated thunderstorms
through the night. Scattered showers after midnight.
.WEDNESDAY...Southeast wind 15 to 20 kt. Gusts to 30 kt with showers.
Wind waves 3 to 5 ft. East swell 4 to 6 ft. Scattered showers and
isolated thunderstorms.
.WEDNESDAY NIGHT...Southeast wind 15 to 20 kt subsiding to 10 kt
after midnight. Wind waves 2 to 4 ft. East swell 5 to 7 ft.
Scattered showers and isolated thunderstorms.
.THURSDAY...Variable wind 5 kt. Wind waves 2 ft or less. East swell
5 ft. Isolated thunderstorms.
.THURSDAY NIGHT...North wind 5 to 10 kt. Wind waves 2 ft or less.
East swell 3 to 4 ft. Isolated thunderstorms.
.FRIDAY AND SATURDAY...Northeast wind 5 to 10 kt. Wind waves 2 ft or
less. East swell 3 to 4 ft. Chance of showers and slight chance of
thunderstorms.
.SUNDAY...Southeast wind 5 kt. Wind waves 2 ft or less. East
swell 3 ft. Slight chance of thunderstorms.

$$

PMZ153-154-162100-
Tinian Coastal Waters-Saipan Coastal Waters-
842 PM ChST Tue Aug 16 2022

.REST OF TONIGHT...East wind 10 to 15 kt with gusts to 25 kt.
Wind waves 2 to 4 ft. East swell 4 to 5 ft. Scattered showers in the
evening. Isolated thunderstorms through the night.
.WEDNESDAY...Southeast wind 10 to 15 kt. Wind waves 2 to 3 ft. East
swell 4 to 6 ft. Isolated thunderstorms.
.WEDNESDAY NIGHT...South wind 5 to 15 kt. Wind waves 2 ft or less.
East swell 4 to 6 ft. Scattered showers and isolated thunderstorms.
.THURSDAY...Variable wind 5 kt. Wind waves 2 ft or less. East swell
4 to 5 ft. Isolated thunderstorms.
.THURSDAY NIGHT AND FRIDAY...North wind 5 to 10 kt. Wind waves 2 ft
or less. East swell 3 to 4 ft. Isolated thunderstorms.
.SATURDAY...Variable wind 5 kt. Wind waves 2 ft or less. East swell
3 ft. Chance of showers and slight chance of thunderstorms.
.SUNDAY...Variable wind 5 kt. Wind waves 2 ft or less. East swell 3
ft. Slight chance of thunderstorms.

$$


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