537
FZPS40 PHFO 182231
HSFSP
HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2330 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC APR 18 2025.
24 HOUR FORECAST VALID 1800 UTC APR 19 2025.
48 HOUR FORECAST VALID 1800 UTC APR 20 2025.
.WARNINGS.
..GALE WARNING
.TROUGH 25S179E 23S179E 17S178W 12S172W MOVING SE SLOWLY. WINDS 20 TO
25 KT S OF 17S BETWEEN 150W AND 180W. ISOLATED MODERATE TSTMS WITHIN
150 NM OF TROUGH.
.24 HOUR FORECAST NEW LOW NEAR 19S179W 1006 MB. FRONT 25S179E TO LOW
TO 25S179E TO 12S160E...AND FROM 17S170W 21S175W TO LOW. WINDS 20 TO 30
KT S OF 17S BETWEEN 142W AND 178W.
.48 HOUR FORECAST LOW MOVED S OF AREA. FRONT MERGED WITH FRONT AND TROUGH
DESCRIBED BELOW. FRONT 25S133W 18S145W 16S151W 15S156W 17S163W 19S167W
23S169W 25S174W 17S177W 14S172E 13S160E. 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 24S139W 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 22S141W THENCE TROUGH 18S150W 14S160W.
.48 HOUR FORECAST FRONT AND TROUGH MERGED WITH FRONT ABOVE.
.TROUGH 10S171E 09S160E NEARLY STATIONARY. ISOLATED MODERATE TSTMS
WITHIN 120 NM OF TROUGH.
.24 HOUR FORECAST TROUGH MERGED WITH FRONT IN WARNING SECTION.
.SEAS 12 TO 13 FT S OF 23S BETWEEN 150W AND 165W. SEAS 8 TO 12 FT
ELSEWHERE S OF LINE 04S120W 19S138W 15S165W 20S160E.
.24 HOUR FORECAST SEAS 12 TO 14 FT S OF LINE 25S145W 18S156W
21S174W 25S178W. SEAS 8 TO 12 FT ELSEWHERE 05S120W 05S130W 17S141W
12S160W 22S160E.
.48 HOUR FORECAST SEAS 12 TO 14 FT S OF LINE 25S136W 18S150W 18S165W
25S175W. SEAS 8 TO 12 FT ELSEWHERE S OF LINE 10S120W 08S130W 10S139W
18S140W 12S155W 23S160E.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS 8 FT OR LESS.
.FORECASTER M BALLARD. HONOLULU HI.
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