High Seas Forecast
Issued by NWS

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FZPN40 PHFO 201528
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC WED SEP 20 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC SEP 20 2017.
24 HOUR FORECAST VALID 1200 UTC SEP 21 2017.
48 HOUR FORECAST VALID 1200 UTC SEP 22 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 13N159W 1010 MB MOVING WNW SLOWLY. WINDS 20 TO 25 KT WITHIN
180 NM NE QUADRANT OF LOW. SCATTERED MODERATE TO STRONG TSTMS
WITHIN 210 NM E SEMICIRCLE OF LOW. ISOLATED MODERATE ELSEWHERE
WITHIN 180 NM OF LOW.
.24 HOUR FORECAST LOW 13N160W 1011 MB. WINDS 20 TO 25 KT WITHIN
150 NM NE QUADRANT OF LOW.
.48 HOUR FORECAST LOW 13N162W 1010 MB. WINDS DIMINISHED TO 20 KT
OR LESS.

.LOW 11N169W 1010 MB MOVING NW SLOWLY. ISOLATED MODERATE TSTMS
WITHIN 240 NM OF LOW.
.24 HOUR FORECAST LOW DISSIPATED.

.FRONT FROM 30N171W TO 26N177W TO 22N170E TO 23N160E MOVING SE
SLOWLY E OF 177W...AND NEARLY STATIONARY ELSEWHERE. ISOLATED
MODERATE TSTMS WITHIN 240 NM E OF FRONT N OF 28N...AND WITHIN 60
NM N OF FRONT W OF 173E.
.24 HOUR FORECAST WEAKENING FRONT FROM 30N170W TO 23N176E TO
22N160E.
.48 HOUR FORECAST FRONT WEAKENED TO TROUGH FROM 30N172W TO 24N176E
TO 24N168E.

.TROUGH FROM 11N169E TO 02N167E MOVING W 15 KT. ISOLATED MODERATE
TSTMS FROM 01N TO 10N W OF 168E...AND ELSEWHERE WITHIN 330 NM E OF
TROUGH N OF 05N.
.24 HOUR FORECAST TROUGH FROM 10N163E TO 05N160E.
.48 HOUR FORECAST TROUGH MOVED FAR W OF FORECAST AREA.

.TROUGH FROM 17N162E TO 12N161E MOVING W 10 KT.
.24 HOUR FORECAST TROUGH MOVED W OF FORECAST AREA.

.HIGH 30N166E 1018 MB MOVING E 15 KT. RIDGES FROM HIGH TO
27N180E...AND FROM HIGH TO 29N160E...MOVING E 15 KT.
.24 HOUR FORECAST HIGH 30N173E 1019 MB.
.48 HOUR FORECAST HIGH 30N180E 1021 MB.

.RIDGE FROM 30N160W TO 26N165W TO 23N174W MOVING NW SLOWLY.

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

.SEAS 8 TO 10 FT N OF A LINE FROM 30N176W TO 23N174E TO 23N160E.
.24 HOUR FORECAST SEAS 8 TO 9 FT FROM 22N TO 25N BETWEEN 179E AND
164E.
.48 HOUR FORECAST SEAS SUBSIDED TO 8 FT OR LOWER.

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

.MONSOON TROUGH FROM 14N140W TO 12N152W TO 13N157W TO FIRST LOW TO
SECOND LOW TO 08N172W. SEE TSTMS ASSOCIATED WITH LOWS DESCRIBED
ABOVE. ISOLATED MODERATE TSTMS ELSEWHERE WITHIN 240 NM OF MONSOON
TROUGH.

$$

.FORECASTER HOUSTON. HONOLULU HI.



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