High Seas Forecast
Issued by NWS

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000
FZPS40 PHFO 250337
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0530 UTC WED APR 25 2018

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

SOUTH PACIFIC EQUATOR TO 25S BETWEEN 120W AND 160E

SYNOPSIS VALID 0000 UTC APR 25 2018.
24 HOUR FORECAST VALID 0000 UTC APR 26 2018.
48 HOUR FORECAST VALID 0000 UTC APR 27 2018.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.COLD FRONT FROM 23S123W TO 23S126W MOVING SE 10 KT.
.24 HOUR FORECAST FRONT S OF FORECAST AREA.

.COLD FRONT FROM 25S138W TO 21S145W MOVING E 10 KT THE THENCE A
STATIONARY FRONT TO 19S152W TO 17S160W. FRONT DISSIPATING W OF
152W. WINDS N TO NW 20 TO 25 KT S OF 21S WITHIN 180 NM E OF FRONT.
SCATTERED MODERATE TSTMS WITHIN 600 NM EITHER SIDE OF FRONTAL
BOUNDARY.
.24 HOUR FORECAST FRONT FROM 25S136W TO 21S144W TO 19S152W.
WINDS N TO NW 20 TO 25 KT S OF 23S WITHIN 180 NM E OF FRONT.
.48 HOUR FORECAST FRONT FROM 25S125W TO 22S132W TO 22S138W.
ASSOCIATED WINDS DIMINISHED TO 20 KT OR LESS.

.COLD FRONT DEVELOPING OVER FORECAST AREA.
.36 HOUR FORECAST TROUGH FROM 25S159W TO 22S161W TO 18S165W.
WINDS
.48 HOUR FORECAST FRONT FROM 25S151W TO 21S156W TO 17S164W.
WINDS N TO NW 20 TO 30 KT S OF 21S WITHIN 300 NM E OF FRONT.

.TROUGH FROM 07S169W TO 13S165W TO 17S160W MOVING WSW 10 KT.
.24 HOUR FORECAST TROUGH FROM 08S175W TO 13S170W TO 18S165W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH FROM 21S160E TO 25S164E MOVING NW SLOWLY. WINDS N TO NE
20 TO 25 KT WITHIN 120 NM E AND NE OF TROUGH AXIS. SCATTERED
MODERATE TO STRONG TSTMS FROM 12S TO 19S W OF 175E. ADDITIONAL
TSTMS INCLUDED BELOW.
.24 HOUR FORECAST TROUGH FROM 18S160E TO 22S163E TO 25S160E.
ASSOCIATED WINDS DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST DEVELOPING LOW 1010 MB NEAR 23S165E. TROUGH FROM
LOW TO 16S160E.

.RIDGE FROM 23S120W TO 19S129W TO 16S138W TO 14S149W.
.24 HOUR FORECAST RIDGE FROM 21S120W TO 20S129W TO 18S138W TO
16S149W.
.48 HOUR FORECAST DEVELOPING HIGH NEAR 21S137W 1015 MB. RIDGE
FROM HIGH TO 16S149W TO 13S161W.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 TO 9 FT SW OF A LINE FROM 22S173W TO 23S161W TO 25S154W.
.24 HOUR FORECAST ASSOCIATED SEAS DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST SEAS BUILDING TO 8 TO 9 T S OF 23S BETWEEN
138W AND 125W.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ FROM 02S138W TO 04S144W TO 03S151W. ISOLATED MODERATE TSTMS
WITHIN 90 NM EITHER SIDE LINE OF CONVERGENCE.

.OTHERWISE AND ELSEWHERE ISOLATED MODERATE TSTMS N OF 14S W OF 160W.

$$

.FORECASTER BEDAL. HONOLULU HI.



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