The High Seas Forecast for the Central North Pacific

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FZPN40 PHFO 201025
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1100 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0600 UTC SEP 20 2017.
24 HOUR FORECAST VALID 0600 UTC SEP 21 2017.
48 HOUR FORECAST VALID 0600 UTC SEP 22 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 12N159W 1010 MB MOVING WNW SLOWLY. SCATTERED MODERATE TO
STRONG TSTMS WITHIN 240 NM NE QUADRANT...AND ELSEWHERE WITHIN 180
NM...OF LOW.
.24 HOUR FORECAST LOW 13N160W 1011 MB.
.48 HOUR FORECAST LOW 13N162W 1011 MB.

.LOW 11N168W 1010 MB MOVING NW SLOWLY. ISOLATED MODERATE TSTMS
WITHIN 150 NM OF LOW.
.24 HOUR FORECAST LOW 12N171W 1011 MB.
.48 HOUR FORECAST LOW DISSIPATED.

.FRONT FROM 30N171W TO 27N175W TO 24N179E TO 23N160E MOVING SE
SLOWLY E OF 179E...AND NEARLY STATIONARY ELSEWHERE. ISOLATED
MODERATE TSTMS WITHIN 120 NM E OF FRONT E OF 175W.
.24 HOUR FORECAST WEAKENING FRONT FROM 30N170W TO 22N174E TO
23N160E.
.48 HOUR FORECAST FRONT WEAKENED TO TROUGH FROM 30N172W TO 25N176E
TO 23N165E.

.TROUGH FROM 11N170E TO 03N169E MOVING W 20 KT. ISOLATED MODERATE
TSTMS FROM 02N TO 10N W OF 170E.
.24 HOUR FORECAST TROUGH FROM 10N163E TO 03N160E.
.48 HOUR FORECAST TROUGH MOVED FAR W OF FORECAST AREA.

.TROUGH FROM 17N163E TO 13N162E MOVING W 15 KT.
.24 HOUR FORECAST TROUGH MOVED W OF FORECAST AREA.

.HIGH 30N164E 1018 MB MOVING E 15 KT. RIDGES FROM HIGH TO
26N178E...AND FROM HIGH TO 29N160E...MOVING E 15 KT.
.24 HOUR FORECAST HIGH JUST N OF FORECAST AREA 31N172E 1019 MB.
.48 HOUR FORECAST HIGH DISSIPATED.

.RIDGE FROM 30N160W TO 27N165W TO 24N173W MOVING NW SLOWLY.

.WINDS 20 KT OR LESS OVER ENTIRE FORECAST AREA.

.SEAS 8 TO 10 FT N OF A LINE FROM 30N176W TO 24N174E TO 24N160E.
.24 HOUR FORECAST SEAS 8 TO 9 FT WITHIN 180 NM OF A LINE FROM
28N178W TO 24N173E TO 23N162E.
.48 HOUR FORECAST SEAS SUBSIDED TO 8 FT OR LOWER.

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

.ISOLATED MODERATE TSTMS FROM 02N TO 08N BETWEEN 175W AND 179E.

.MONSOON TROUGH FROM 13N140W TO 12N149W TO FIRST LOW TO SECOND LOW
TO 08N173W. 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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