082
FZPN40 PHFO 210306
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC THU AUG 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC AUG 21 2025.
24 HOUR FORECAST VALID 0000 UTC AUG 22 2025.
48 HOUR FORECAST VALID 0000 UTC AUG 23 2025.

.WARNINGS.



.NONE.

.SYNOPSIS AND FORECAST.

.LOW 1008 MB NEAR 12N147W MOVING W 10 KT. NE WINDS 20 TO 25 KT AND
SEAS 2.5 TO 3 M WITHIN 120 NM N SEMICIRCLE OF LOW. SCATTERED
MODERATE TSTMS WITHIN 120 NM OF LOW.
.24 HOUR FORECAST LOW NEAR 13N151W 1010 MB. NE WINDS 20 TO 25 KT
AND SEAS 2.5 TO 3 M WITHIN 210 NM N SEMICIRCLE OF LOW.
.48 HOUR FORECAST LOW NEAR 12N155W

.TROUGH FROM 12N164W TO 08N168W MOVING W 15 KT. NE WINDS 20 TO 25
KT AND SEAS 2.5 TO 3 M FROM 11N TO 17N BETWEEN 160W AND 170W.
ISOLATED MODERATE TSTMS FROM 10N TO 12N BETWEEN 156W AND 163W.
.24 HOUR FORECAST TROUGH FROM 12N170W TO 07N174W. ENE WINDS 20 TO
25 KT AND SEAS 2.5 TO 3 M FROM 12N TO 16N BETWEEN 165W AND 176W.
.48 HOUR FORECAST TROUGH FROM 13N177W TO 08N178E. ENE WINDS 20 TO
25 KT AND SEAS 2.5 TO 3 M FROM 11N TO 17N BETWEEN 173W AND 177E.

.TROUGH FROM 30N168W TO 24N169W MOVING SLOWLY W. SCATTERED
MODERATE TO STRONG TSTMS WITHIN 120 NM PRIMARILY E OF TROUGH N OF
25N.
.24 HOUR FORECAST TROUGH FROM 30N171W TO 27N171W.
.48 HOUR FORECAST WEAKENED TROUGH MOVED N AND DISSIPATED.

.TROUGH FROM 28N168E TO 28N172E TO 28N178E 25N178W MOVING N SLOWLY.
SCATTERED MODERATE TSTMS FROM 24N TO 29N BETWEEN 176W AND
176E...AND FROM 27N TO 29N BETWEEN 171E AND 166E.
.24 HOUR FORECAST NEW LOW NEAR 29N173E 1014 MB. TROUGH FROM
30N176E TO LOW TO 26N170E. ANOTHER TROUGH FROM LOW TO 27N178E.
.48 HOUR FORECAST LOW MOVED N OF AREA. TROUGH FROM 30N178W TO
28N176W. SECOND TROUGH FROM 28N174W TO 27N180W.

.TROUGH FROM 24N161E TO 23N160E MOVING NE 10 KT. SCATTERED MODERATE
TO STRONG TSTMS FROM 20N TO 26N W OF 166E.
.24 HOUR FORECAST TROUGH FROM 24N160E TO 26N163E.
.48 HOUR FORECAST TROUGH FROM 25N160E TO 26N163E.

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

.MONSOON TROUGH FROM 11N140W TO 12N145W TO 09N151W THENCE ITCZ TO
07N162W TO 06N168W TO 10N173E TO 09N167E. SCATTERED MODERATE TSTMS
WITHIN 180 NM OF MONSOON TROUGH E OF 150W...AND WITHIN 210 NM N
OF ITCZ BETWEEN 153W AND 165W...AND WITHIN 240 NM S OF ITCZ
BETWEEN 175W AND 168E. ISOLATED MODERATE TSTMS ELSEWHERE WITHIN
120 NM EITHER SIDE OF ITCZ.


$$

.FORECASTER TSAMOUS. HONOLULU HI.