457  
FZPS40 PHFO 232234  
HSFSP  
 
HIGH SEAS FORECAST  
NATIONAL WEATHER SERVICE HONOLULU HI  
2330 UTC WED SEP 23 2020  
 
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS  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 SEP 23 2020.  
24 HOUR FORECAST VALID 1800 UTC SEP 24 2020.  
48 HOUR FORECAST VALID 1800 UTC SEP 25 2020.  
 
.WARNINGS.  
 
.NONE.  
 
.SYNOPSIS AND FORECAST.  
 
.TROUGH 25S156W 20S162W 13S170W 10S180W NEARLY STATIONARY. WINDS  
20 TO 30 KT S OF 20S BETWEEN 155W AND 164W. SEE SEAS BELOW.  
ISOLATED MODERATE TSTMS WITHIN 120 NM OF TROUGH E OF 172W.  
.24 HOUR FORECAST TROUGH 25S152W 18S164W 12S171W. WINDS DIMINISHED  
TO 20 KT OR LESS. SEE SEAS BELOW.  
.48 HOUR FORECAST TROUGH BECOMING FRONT 25S144W 21S152W 17S167W.  
 
.TROUGH 25S165W 20S171W 16S180E 11S174E MOVING E SLOWLY S OF  
18S...AND NEARLY STATIONARY ELSEWHERE. ISOLATED MODERATE TSTMS  
WITHIN 90 NM NE OF TROUGH S OF 20S.  
.24 HOUR FORECAST TROUGH DISSIPATED.  
 
.TROUGH 15S140W 18S139W 21S138W MOVING WSW 10 KT.  
.24 HOUR FORECAST TROUGH DISSIPATED.  
 
.TROUGH 25S143W 23S145W NEARLY STATIONARY.  
.24 HOUR FORECAST TROUGH DISSIPATED.  
 
.E WINDS 20 TO 25 KT FROM 10S TO 21S E OF 140W.  
.24 HOUR FORECAST E WINDS 20 TO 25 KT FROM 16S TO 19S E OF 123W.  
.48 HOUR FORECAST WINDS DIMINISHED TO 20 KT OR LESS.  
 
.48 HOUR FORECAST NEW TROUGH 25S125W 21S126W.  
   
OTHERWISE
 
WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.  
 
.SEAS 8 TO 10 FT S OF LINE 25S165W 21S155W 20S142W 09S135W 11S120W.  
.24 HOUR FORECAST SEAS 8 TO 12 FT S OF LINE 25S154W 15S140W 10S129W  
11S120W.  
.48 HOUR FORECAST SEAS 8 TO 11 FT S OF LINE 25S138W 14S138W 07S130W  
05S120W.  
   
OTHERWISE
 
SEAS 8 FT OR LOWER OVER REMAINDER OF FORECAST AREA.  
   
ISOLATED MODERATE TSTMS FROM 08S TO 13S W OF 166E
 
AND WITHIN 90  
NM OF 03S168E.  
 

 
 
.FORECASTER POWELL. HONOLULU HI.  
 
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