The High Seas Forecast for the Central North Pacific

High Seas Forecast Issued: 07/24/2025 01:02:31 AM UTC
                        
669
FZPN40 PHFO 231502
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC WED JUL 23 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 1200 UTC JUL 23 2025.
24 HOUR FORECAST VALID 1200 UTC JUL 24 2025.
48 HOUR FORECAST VALID 1200 UTC JUL 25 2025.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW NEAR 29N168W 1015 MB MOVING N SLOWLY. TROUGH FROM LOW TO
27N171W 25N175W NEARLY STATIONARY. ISOLATED MODERATE TSTMS N OF
25N BETWEEN 178W AND 167W.
.24 HOUR FORECAST LOW MOVED N OF AREA. TROUGH 30N167W 27N168W
26N171W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 30N172E 27N170E 26N167E. ISOLATED MODERATE TSTMS WITHIN
120 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 26N160W 22N163W MOVING E SLOWLY. ISOLATED MODERATE TSTMS
WITHIN 120 NM E OF TROUGH.
.24 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 21N140W 16N144W MOVING W SLOWLY. ISOLATED MODERATE TSTMS
WITHIN 210 NM SE OF TROUGH.
.24 HOUR FORECAST TROUGH 22N143W 18N147W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.48 HOUR FORECAST NEW LOW NEAR 29N174W. TROUGH FROM LOW TO 26N174W
26N179W.

.WINDS 20 TO 25 KT FROM 20N TO 15N BETWEEN 145W AND 143W...AND
FROM 20N TO 16N E OF 146W.
 .24 HOUR FORECAST WINDS EASED 20 KT OR LESS.

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

.SEAS 2.5 TO 3 M FROM 20N TO 11N E OF 160W.
.24 HOUR FORECAST SEAS 18N TO 08N BETWEEN 167W AND 148W.
.48 HOUR FORECAST SEAS LOWERED 2.5 M OR LESS.

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

.ITCZ 07N140W 09N152W 07N172W 06N179E 06N173E. SCATTERED MODERATE
TO STRONG TSTMS WITHIN 270 NM OF ITCZ BETWEEN 179E AND 151W.
ISOLATED MODERATE TSTMS ELSEWHERE WITHIN 120 NM.

.ISOLATED MODERATE TSTMS FROM 17N TO 09N W OF 168W.


$$

.FORECASTER PIERCE. HONOLULU HI.