046
FZPN40 PHFO 171450
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC SUN AUG 17 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 AUG 17 2025.
24 HOUR FORECAST VALID 1200 UTC AUG 18 2025.
48 HOUR FORECAST VALID 1200 UTC AUG 19 2025.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 30N167W 25N169N NEARLY STATIONARY. NUMEROUS STRONG TSTMS
N OF 26N BETWEEN 172W AND 163W.
.24 HOUR FORECAST TROUGH 30N168W 25N168W.
.48 HOUR FORECAST TROUGH 30N171W 26N173W.

.TROUGH 30N178E 25N176E NEARLY STATIONARY. ISOLATED MODERATE TSTMS
WITHIN 180 NM OF TROUGH.
.24 HOUR FORECAST TROUGH 30N175E 25N172E.
.48 HOUR FORECAST TROUGH 30N174E 25N172E.

.TROUGH 28N165E 21N160E MOVING NW 10 KT. ISOLATED MODERATE TSTMS
WITHIN 330 NM E OF TROUGH... AND WITHIN 180 NM W OF TROUGH W OF
163E.
.24 HOUR FORECAST TROUGH 30N163E 24N160E.
.48 HOUR FORECAST TROUGH 30N163E 27N160E.

.TROUGH 24N152W 18N150W MOVING W 10 KT.
.24 HOUR FORECAST TROUGH 22N157W 19N157W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.SEAS 2.5 TO 3 M FROM 10N TO 17N BETWEEN 160W AND 145W.
.24 HOUR FORECAST SEAS DIMINISHED TO 2.5 M OR LESS.

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

.ITCZ 10N140W 10N160W 06N174W 03N170E. SCATTERED MODERATE TSTMS
WITHIN 180 NM N OF ITCZ BETWEEN 158W AND 153W. ISOLATED MODERATE
TSTMS ELSEWHERE WITHIN 90 NM S OF ITCZ W OF 155W.

.ISOLATED MODERATE TSTMS FROM 02N TO 14N W OF 170E... AND FROM 10N
TO 12N BETWEEN 172W AND 169W... AND N OF 29N BETWEEN 162E AND
165E.

$$

.FORECASTER SHIGESATO. HONOLULU HI.