High Seas Forecast
Issued by NWS

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FZPN40 PHFO 210325
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC THU SEP 21 2017

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS

SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT
OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE MORE THAN
TWICE THE SIGNIFICANT WAVE HEIGHT.

THIS HIGH SEAS FORECAST USES 1-MINUTE AVERAGE WINDS WHICH MAY BE
HIGHER THAN 10-MINUTE AVERAGE WINDS.

SECURITE

NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 0000 UTC SEP 21 2017.
24 HOUR FORECAST VALID 0000 UTC SEP 22 2017.
48 HOUR FORECAST VALID 0000 UTC SEP 23 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 13N159W 1010 MB NEARLY STATIONARY. TROUGH FROM LOW TO 11N152W
TO 13N145W TO 13N140W NEARLY STATIONARY. ISOLATED MODERATE TSTMS
FROM 09N TO 14N BETWEEN 149W AND 159W...AND FROM 12N TO 14N E OF
147W.
.24 HOUR FORECAST LOW 13N159W 1010 MB. TROUGH FROM LOW TO 14N150W TO
11N140W. WINDS 20 TO 25 KT WITHIN 180 NM NE QUADRANT OF LOW.
.48 HOUR FORECAST LOW 14N161W 1010 MB. TROUGH FROM LOW TO 14N150W TO
10N140W. WINDS EASED TO 20 KT OR LESS.

.FRONT FROM 30N170W TO 24N180E TO 22N170E TO 23N160E NEARLY
STATIONARY. ISOLATED MODERATE TSTMS WITHIN 60 NM OF FRONT W OF 179E.
.24 HOUR FORECAST WEAKENING FRONT FROM 30N171W TO 25N180E TO 22N160E.
.48 HOUR FORECAST FRONT WEAKENED TO TROUGH FROM 30N173W TO 24N176E.

.TROUGH FROM 09N165E TO 06N165E TO 02N162E MOVING W 15 KT. ISOLATED
TO LOCALLY SCATTERED MODERATE TO STRONG TSTMS FROM 05N TO 09N W OF
170E...AND FROM 02N TO 05N W OF 165E.
.24 HOUR FORECAST TROUGH MOVED W OF FORECAST AREA.

.TROUGH FROM 13N172W TO 06N176W MOVING W 10 KT. ISOLATED MODERATE
TSTMS FROM 10N TO 12N BETWEEN 168W AND 170W.
.24 HOUR FORECAST WEAK TROUGH FROM 12N175W TO 07N179W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.HIGH 30N169E 1019 MB MOVING ENE 20 KT. RIDGE FROM 29N160E TO HIGH
TO 28N177E TO 28N179W.
.24 HOUR FORECAST HIGH MOVED N OF FORECAST AREA.

.RIDGE FROM 30N165W TO 23N175W MOVING N SLOWLY AND GRADUALLY ERODING
FROM THE W.

.OTHERWISE...WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.

.SEAS 8 TO 9 FT N OF 23N BETWEEN 163E AND 177W.
.24 HOUR FORECAST SEAS SUBSIDED TO 8 FT OR LOWER.

.OTHERWISE...SEAS 8 FT OR LOWER OVER REMAINDER OF FORECAST AREA.

.ISOLATED MODERATE TSTMS FROM 11N TO 15N BETWEEN 171E AND 174E...AND
S OF 06N BETWEEN 175E AND 179E.

$$

.FORECASTER KINEL. HONOLULU HI.



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