558
FZPS40 PHFO 181535
HSFSP
HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1730 UTC FRI APR 18 2025
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC APR 18 2025.
24 HOUR FORECAST VALID 1200 UTC APR 19 2025.
48 HOUR FORECAST VALID 1200 UTC APR 20 2025.
.WARNINGS.
..GALE WARNING
.TROUGH 25S178E 20S179E 12S172W MOVING SE SLOWLY. WINDS 20 TO 25
KT S OF LINE 25S157W 16S166W 25S174W...AND FROM 24S TO 20S BETWEEN
177W AND 179W. ISOLATED MODERATE TSTMS WITHIN 150 NM OF TROUGH.
.24 HOUR FORECAST NEW LOW NEAR 20S178W 1006 MB. TROUGH 25S179E TO
LOW TO 17S170W. WINDS 20 TO 30 KT S OF 17S BETWEEN 142W AND 178W.
.48 HOUR FORECAST LOW MOVED S OF AREA. TROUGH MERGED WITH TROUGH
AS DESCRIBED IMMEDIATELY BELOW. WINDS 30 TO 40 KT S OF 22S BETWEEN
166W AND 175W. WINDS 20 TO 30 KT S OF 18S BETWEEN 138W AND 174W.
.SYNOPSIS AND FORECAST.
.FRONT 25S138W 20S147W THENCE TROUGH 15S154W 10S164W. FRONT
NEARLY STATIONARY AND TROUGH MOVING SW SLOWLY. SCATTERED MODERATE
TSTMS WITHIN 240 NM NE OF TROUGH.
.24 HOUR FORECAST FRONT 25S135W 20S146W THENCE TROUGH 14S165W.
.48 HOUR FORECAST FRONT 25S133W 22S137W THENCE TROUGH 18S163W
25S173W.
.TROUGH 10S171E 09S160E MOVING NEARLY STATIONARY. ISOLATED
MODERATE TSTMS WITHIN 120 NM OF TROUGH.
.24 HOUR FORECAST TROUGH 13S170E 12S160E.
.48 HOUR FORECAST TROUGH 12S171E 12S160E.
.SEAS 8 TO 12 FT S OF LINE 19S160E 22S171E 20S178W 16S160W
19S135W 08S131W 03S120W.
.24 HOUR FORECAST SEAS 12 TO 14 FT S OF LINE 25S145W 18S156W
21S167W 25S162W. SEAS 8 TO 12 FT ELSEWHERE 22S160E 20S177W 14S167W
14S153W 18S141W 07S135W 04S123W 06S120W.
.48 HOUR FORECAST SEAS 12 TO 14 FT S OF LINE 25S158W 23S141W
18S157W 18S163W 25S177W. SEAS 8 TO 12 FT ELSEWHERE S OF LINE
21S160E 21S175W 13S152W 19S140W 09S137W 07S130W 10S129W 10S120W.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS 8 FT OR LESS.
.ITCZ 01S123W 06S130W 07S139W. SCATTERED MODERATE TSTMS WITHIN
270 NM N OF ITCZ...AND 180 NM S OF ITCZ.
.FORECASTER PIERCE. HONOLULU HI.
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