218
FZPN40 PHFO 180912
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1100 UTC MON AUG 18 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0600 UTC AUG 18 2025.
24 HOUR FORECAST VALID 0600 UTC AUG 19 2025.
48 HOUR FORECAST VALID 0600 UTC AUG 20 2025.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 30N167W 26N170N NEARLY STATIONARY. SCATTERED MODERATE TSTMS
WITHIN 90 NM OF TROUGH. ISOLATED MODERATE TSTMS ELSEWHERE N 0F 25N
BETWEEN 170W AND 165W.
.24 HOUR FORECAST TROUGH 30N171W 26N172W.
.48 HOUR FORECAST TROUGH 30N172W 26N173W.

.TROUGH 30N176E 25N175E MOVING W 10 KT. ISOLATED MODERATE TSTMS N
OF 26N BETWEEN TROUGH AND 178W.
.24 HOUR FORECAST TROUGH 30N171E 28N170E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.TROUGH 30N161E 23N163E NEARLY STATIONARY. ISOLATED MODERATE TSTMS
N OF 24N BETWEEN TROUGH AND 170E.
.24 HOUR FORECAST TROUGH 30N163E 24N164E.
.48 HOUR FORECAST TROUGH 30N163E 26N162E.

.TROUGH 26N155W 22N155W MOVING W 15 KT.
.24 HOUR FORECAST TROUGH 26N162W 20N162W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.24 HOUR FORECAST NEW TROUGH 11N155W 07N156W. WINDS 20 TO 25 KT
WITHIN 60 NM OF TROUGH N OF 09N.
.48 HOUR FORECAST TROUGH 12N160W 08N161W. WINDS 20 TO 25 KT WITHIN
90 NM OF TROUGH N OF 10N.

.SEAS 2.5 TO 3 M FROM 10N TO 14N BETWEEN 155W AND 150W.
.24 HOUR FORECAST SEAS DIMINISHED TO 2.5 M OR LESS.
.48 HOUR FORECAST SEAS 2.5 M TO 3 M FROM 10N TO 15N BETWEEN 163W AND
158W.

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

.ITCZ 10N140W 08N160W 03N177E. ISOLATED MODERATE TSTMS WITHIN 210 NM
OF ITCZ.

.ISOLATED MODERATE TSTMS FROM 04N TO 08N W OF 165E.

$$

.FORECASTER SHIGESATO. HONOLULU HI.