402
FZPN40 PHFO 190308
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC TUE AUG 19 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 19 2025.
24 HOUR FORECAST VALID 0000 UTC AUG 20 2025.
48 HOUR FORECAST VALID 0000 UTC AUG 21 2025.

.WARNINGS.



.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 30N172W 28N172W 27N172W MOVING NW SLOWLY. SCATTERED
MODERATE TSTMS N OF 26N BETWEEN 165W AND 169W.
.24 HOUR FORECAST TROUGH 30N176W 29N179E 28N169E.
.48 HOUR FORECAST TROUGH 30N178W 28N176E 26N172E.

.TROUGH 28N174E 25N169E MOVING N 10 KT. ISOLATED MODERATE TSTMS
FROM 24N TO 28N BETWEEN 173E AND 170E.
.24 HOUR FORECAST TROUGH MOVED N OF AREA.

.TROUGH 30N164E 28N164E MOVING NE SLOWLY. SCATTERED MODERATE TSTMS
N OF 25N BETWEEN 172E AND 164E.
.24 HOUR FORECAST TROUGH 30N162E 26N160E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.24 HOUR FORECAST NEW TROUGH 12N159W 10N159W 09N160W. WINDS 20 TO
25 KT WITHIN 60 NM OF TROUGH N OF 10N.
.48 HOUR FORECAST TROUGH 13N164W 10N165W 05N167W. WINDS 20 TO 25 KT
WITHIN 90 NM OF TROUGH N OF 11N.

.SEAS 2.5 TO 3 M FROM 10N TO 13N BETWEEN 154W AND 158W.
.24 HOUR FORECAST SEAS DIMINISHED TO 2.5 M OR LESS.
.48 HOUR FORECAST SEAS 2.5 M TO 3 M FROM 10N TO 14N BETWEEN 161W
AND 168W.

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

.MONSOON TROUGH 12N140W 11N147W 10N151W 10N165W THENCE ITCZ 09N174W
07N180W 05N175E 04N170E. ISOLATED MODERATE TSTMS WITHIN 210 NM OF
TROUGH AND ITCZ..ISOLATED MODERATE TSTMS FROM 01N TO 08N W OF 165E.



$$

.FORECASTER TSAMOUS. HONOLULU HI.