876
FZPN40 PHFO 181521
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC FRI SEP 18 2026

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 180W

SYNOPSIS VALID 1200 UTC SEP 18 2026.
24 HOUR FORECAST VALID 1200 UTC SEP 19 2026.
48 HOUR FORECAST VALID 1200 UTC SEP 20 2026.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH FROM 30N151W 25N155W 20N159W MOVING W 10 KT. ISOLATED
MODERATE TSTMS WITHIN 180 NM OF TROUGH S OF 25N.
.24 HOUR FORECAST TROUGH DISSIPATED.

.LOW NEAR 11N157W 1008 MB MOVING W SLOWLY. SCATTERED MODERATE
TSTMS WITHIN 240 NM N SEMICIRCLE OF LOW.
.24 HOUR FORECAST LOW NEAR 11N159W 1010 MB.
.48 HOUR FORECAST DISSIPATING LOW NEAR 13N161W.

.24 HOUR FORECAST NEW LOW 15N140W 1010 MB.
.48 HOUR FORECAST LOW 14N142W 1009MB. TROUGH FROM LOW TO 22N145W.

.E TO NE WINDS 20 TO 25 KT FROM 15N TO 24N E OF 155W AND N OF 19N
W OF 160W.
.24 HOUR FORECAST E WINDS 20 TO 25 KT FROM 16N TO 24N.
.48 HOUR FORECAST E WINDS 20 TO 25 KT FROM 16N TO 25N E OF 150W.

.SEAS 2.5 TO 3.5 M FROM 12N TO 24N E OF 153W.
.24 HOUR FORECAST SEAS 2.5 TO 3.5 M FROM 14N TO 24N E OF
162W...AND FROM 19N TO 27N W OF 164W.
.48 HOUR FORECAST SEAS 2.5 TO 3 M FROM 14N TO 24N BETWEEN 168W AND
143W.

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

.MONSOON TROUGH 11N140W 11N157W 07N167W 03N180W. ISOLATED
MODERATE TSTMS WITHIN 180 NM N OF TROUGH E OF 170W...AND FROM 08N
TO 13N E OF 153W.

$$

.FORECASTER EE. HONOLULU HI.