064  
FZPS40 PHFO 242204  
HSFSP  
 
HIGH SEAS FORECAST  
NATIONAL WEATHER SERVICE HONOLULU HI  
2330 UTC TUE APR 24 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS  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 1800 UTC APR 24 2018.  
24 HOUR FORECAST VALID 1800 UTC APR 25 2018.  
48 HOUR FORECAST VALID 1800 UTC APR 26 2018.  
 
.WARNINGS.  
 
.NONE.  
 
.SYNOPSIS AND FORECAST.  
 
.COLD FRONT FROM 25S126W TO 23S129W MOVING E SLOWLY THENCE A  
TROUGH TO 23S134W.  
.24 HOUR FORECAST FRONT S OF FORECAST AREA. TROUGH FROM  
23S133W TO 24S127W.  
.36 HOUR FORECAST TROUGH S OF FORECAST AREA.  
 
.COLD FRONT FROM 25S140W TO 21S144W MOVING E 10 KT THENCE A  
STATIONARY FRONT TO 19S151W TO 19S158W. WINDS N TO NW 20 TO 25 KT  
WITHIN 180 NM E OF FRONT S OF 23S. SCATTERED MODERATE TSTMS WITHIN  
SCATTERED MODERATE TSTMS WITHIN 480 NM E AND NE OF FRONT. ISOLATED  
MODERATE TSTMS WITHIN 240 NM S AND SW OF FRONT.  
.24 HOUR FORECAST FRONT FROM 25S138W TO 22S144W TO 21S151W  
THENCE A TROUGH TO 19S158W. ASSOCIATED WINDS DIMINISHED TO 20 KT OR  
LESS.  
.48 HOUR FORECAST FRONT FROM 25S129W TO 22S134W 22S139W.  
TROUGH FROM 25S153W TO 24S146W.  
 
.COLD FRONT DEVELOPING OVER FORECAST AREA.  
.36 HOUR FORECAST TROUGH FROM 25S159W TO 21S162W TO 19S164W.  
.48 HOUR FORECAST FRONT FROM 25S153W TO 20S159W TO 16S166W.  
WINDS N TO NW 20 TO 30 KT S OF 20S WITHIN 180 NM E OF FRONT.  
 
.TROUGH FROM 07S170W TO 11S166W TO 14S160W MOVING W 10 KT.  
ASSOCIATED TSTMS INCLUDED BELOW.  
.24 HOUR FORECAST TROUGH FROM 08S174W TO 14S168W TO 19S158W.  
.48 HOUR FORECAST TROUGH FROM 08S177E TO 10S174W TO 16S166W.  
 
.TROUGH APPROACHING FORECAST AREA FROM W. SCATTERED MODERATE TO  
STRONG TSTMS FROM 04S TO 18S W OF 175E. ADDITIONAL TSTMS INCLUDED  
BELOW.  
.24 HOUR FORECAST TROUGH FROM 19S160E TO 22S166E.  
.48 HOUR FORECAST TROUGH FROM 19S160E TO 25S168E.  
 
.RIDGE FROM 22S120W TO 17S134W TO 14S151W.  
.24 HOUR FORECAST RIDGE FROM 22S120W TO 19S132W TO 17S144W.  
.48 HOUR FORECAST RIDGES FROM 22S120W TO 19S132W AND FROM 19S143W TO  
14S160W.  
 
.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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