FZPN40 PHFO 210307
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC THU MAY 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC MAY 21 2026.
24 HOUR FORECAST VALID 0000 UTC MAY 22 2026.
48 HOUR FORECAST VALID 0000 UTC MAY 23 2026.

.WARNINGS.

...GALE WARNING...
.NE TO E WINDS 30 TO 35 KT AROUND THE MAIN HAWAIIAN ISLANDS. FOR
DETAILS SEE COASTAL WATERS FORECAST ISSUED BY NWS HONOLULU UNDER
AWIPS HEADER HFOCWFHFO AND WMO HEADER FZHW50 PHFO. SEE MORE
WINDS BELOW.
.24 HOUR FORECAST LITTLE CHANGE. SEE MORE WINDS BELOW.
.48 HOUR FORECAST LITTLE CHANGE. SEE MORE WINDS BELOW.

.SYNOPSIS AND FORECAST.

.FRONT 30N171W 28N175W THENCE TROUGH 23N178W MOVING W 10 KT.
.24 HOUR FORECAST FRONT WEAKENING TO TROUGH 30N178W 26N180W.
.48 HOUR FORECAST TROUGH MOVED W OF AREA.

.WINDS 20 TO 30 KT FROM 15N TO 25N BETWEEN 160W AND 145W...AND
FROM 10N TO 15N BETWEEN 165W AND 155W.
.24 HOUR FORECAST WINDS 20 TO 25 KT FROM 10N TO 20N BETWEEN 175W AND
153W...AND FROM 20N TO 25N BETWEEN 163W AND 150W.
.48 HOUR FORECAST WINDS 20 TO 30 KT FROM 10N TO 18N BETWEEN 165W AND
175W...AND FROM 18N TO 28N BETWEEN 170W AND 150W.

.WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.

.SEAS 2.5 TO 3 M EAST OF A LINE 30N165W TO 08N176W.
.24 HOUR FORECAST SEAS 2.5 TO 3 M FROM 08N TO 28N E OF 170W.
.48 HOUR FORECAST SEAS 2.5 TO 3 M FROM 06N TO 29N E OF 175W.

.SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA.

.ITCZ 06N180W 03N165W 05N155W 05N140W. SCATTERED MODERATE TSTMS
WITHIN 150 NM OF ITCZ W OF 165W. ISOLATED MODERATE TSTMS WITHIN
150 NM N OF ITCZ E OF 160W.

$$

.FORECASTER EVANS. HONOLULU HI.