The High Seas Forecast for the South Pacific

High Seas Forecast Issued: 12/16/2025 08:46:42 AM UTC
                        
820
FZPS40 PHFO 152246
HSFSP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2330 UTC MON DEC 15 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 DEC 15 2025.
24 HOUR FORECAST VALID 1800 UTC DEC 16 2025.
48 HOUR FORECAST VALID 1800 UTC DEC 17 2025.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL CYCLONE 08P 15.2S 171.8E 1002 MB MOVING ESE 08 KT.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. WINDS 34 KT OR GREATER
WITHIN 65 NM NE...AND 30 NM SE QUADRANTS. WINDS 20 TO 33 KT
ELSEWHERE WITHIN 120 NM FROM CENTER. SEAS 2.5 TO 4.5 M WITHIN 150
NM OF CENTER. NUMEROUS MODERATE TO STRONG TSTMS WITHIN 150 NM E
SEMICIRCLE OF CENTER.
.24 HOUR FORECAST TROPICAL CYCLONE 08P 14.9S 173.8E. MAXIMUM
SUSTAINED WINDS 35 KT GUSTS 45 KT. WINDS 34 KT OR GREATER WITHIN
50 NM NE...30 NM SE...20 NM SW...30 NM NW QUADRANTS. WINDS 20 TO
33 KT ELSEWHERE WITHIN 120 NM OF CENTER. SEAS 2.5 TO 5 M WITHIN
150 NM E SEMICIRCLE...AND 90 NM W SEMICIRCLE OF CENTER.
.48 HOUR FORECAST TROPICAL CYCLONE 08P DISSIPATED AS A SIGNIFICANT
TROPICAL CYCLONE.

FORECAST WINDS NEAR TROPICAL CYCLONES SHOULD BE USED WITH CAUTION
DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE...AND INTENSITY.

SEE THE LATEST BULLETIN FROM JTWC UNDER WMO HEADER WTPS31 PGTW
FOR ADDITIONAL DETAILS.

.SYNOPSIS AND FORECAST.

.LOW 18S178E 1006 MB MOVING E 15 KT. TROUGH FROM LOW TO 15S180W
15S175W.
.24 HOUR FORECAST LOW 18S171W 1006 MB. TROUGH FROM LOW TO
15S180W AND FROM LOW TO 20S160W.
.48 HOUR FORECAST LOW 17S164W 1004 MB. TROUGH FROM LOW TO
17S170W AND FROM LOW TO 25S150W.

.LOW 15S173W 1006 MB MOVING SE 20 KT. TROUGH FROM LOW TO 15S160W
20S150W 25S146W.
.24 HOUR FORECAST LOW 19S163W 1007 MB. TROUGH FROM LOW TO 20S155W
25S150W.
.48 HOUR FORECAST LOW WEAKENING TO TROUGH. TROUGH 18S160W
20S150W 25S144W.

.TROUGH 10S146W 15S145W MOVING SW SLOWLY.
.24 HOUR FORECAST TROUGH DISSIPATED.

.WINDS 20 KT OR LESS AND SEAS 2.5 M OR LOWER OVER REMAINDER OF
FORECAST AREA.

.ISOLATED MODERATE TSTMS WITHIN 150 NM OF POINT 12S143W...AND
FROM 10S TO 04S BETWEEN 180W AND 160W.

$$

.FORECASTER PECHACEK. HONOLULU HI.