The High Seas Forecast for the South Pacific

High Seas Forecast Issued: 05/21/2025 09:00:20 AM UTC
                        
021
FZPS40 PHFO 202300
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2330 UTC TUE MAY 20 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 MAY 20 2025.
24 HOUR FORECAST VALID 1800 UTC MAY 21 2025.
48 HOUR FORECAST VALID 1800 UTC MAY 22 2025.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 25S149W 20S153W 16S160W 13S170W MOVING W SLOWLY S OF 16S
AND NEARLY STATIONARY AND DISSIPATING ELSEWHERE. ISOLATED MODERATE
TSTMS WITHIN 180 NM N AND E OF TROUGH.
.24 HOUR FORECAST TROUGH 25S157W 14S160W.
.48 HOUR FORECAST TROUGH ABSORBED BY FRONT DESCRIBED IMMEDIATELY
BELOW.

.24 HOUR FORECAST NEW FRONT 25S167W 21S175W 21S174E 25S164E. E TO
SE WINDS 20 TO 25 KT AND SEAS 2.5 TO 3 M S OF FRONT.
.48 HOUR FORECAST FRONT 25S152W 18S157W 18S177E 25S161E. E TO SE
WINDS 20 TO 30 KT S OF LINE 14S164W 14S174W 25S161E. SEAS 2.5 TO
4 M S OF LINE 25S157W 14S175E 25S160E.

.TROUGH 25S164E 16S160E MOVING W SLOWLY. ISOLATED MODERATE TSTMS
WITHIN 90 NM OF TROUGH.
.24 HOUR FORECAST TROUGH 25S161E 22S160E.
.48 HOUR FORECAST TROUGH MOVED W OF AREA.

.TROUGH 10S176E 07S167E 03S164E MOVING W SLOWLY. SCATTERED MODERATE
TSTMS N OF 14S W OF 179E.
.24 HOUR FORECAST WEAK TROUGH 10S172E 04S162E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.SE WINDS 20 TO 25 KT S OF 22S E OF 130W.
.24 HOUR FORECAST E WINDS 20 TO 25 KT S OF 22S E OF 125W.
.48 HOUR FORECAST WINDS DIMINISHED TO 20 KT OR LESS.

.WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.

.SEAS MAINLY 2.5 TO 3.5 M S OF 03S E OF 160W.
.24 HOUR FORECAST SEAS 2.5 TO 3.5 M S OF 03S E OF 145W.
.48 HOUR FORECAST SEAS 2.5 TO 3 M S OF 03S E OF 135W.

.SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA.

.SCATTERED MODERATE TSTMS FROM 12S TO 03S BETWEEN 162W AND 179E.

$$

.FORECASTER AHUE. HONOLULU HI.