FZPN40 PHFO 182118
HSFNP 

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
2300 UTC MON MAY 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC MAY 18 2026.
24 HOUR FORECAST VALID 1800 UTC MAY 19 2026.
48 HOUR FORECAST VALID 1800 UTC MAY 20 2026.

.WARNINGS.

.NONE.
   
.SYNOPSIS AND FORECAST.

.TROUGH 30N173W 23N176W MOVING E 10 KT. 
.24 HOUR FORECAST TROUGH 30N168W 25N173W 19N173W.
.48 HOUR FORECAST TROUGH DISSIPATED.

.WINDS 20 TO 25 KT FROM 05N TO 18N E OF 164W.
.24 HOUR FORECAST WINDS 20 TO 25 KT N OF 10N E OF 151W.
.48 HOUR FORECAST WINDS 20 TO 25 KT IN AREA BOUNDED BY 29N151W 
26N140W 08N140W 08N180W 14N180W 29N151W.

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

.SEAS 2.5 TO 3.5 M FROM 24N TO 07N E OF 165W.
.24 HOUR FORECAST SEAS 2.5 TO 3.5 M IN AREA BOUNDED BY 30N150W 
30N140W 07N140W 12N172W 30N150W.
.48 HOUR FORECAST SEAS 2.5 TO 4 M IN AREA BOUNDED BY 30N150W 
30N140W 06N140W 10N178W 30N150W.

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

.ITCZ 07N140W 02N152W 07N162W 05N180W. ISOLATED MODERATE TSTMS
WITHIN 270 NM OF ITCZ E OF 163W...AND WITHIN 150 NM OF ITCZ W 
OF 175W.

$$

.FORECASTER FOSTER. HONOLULU HI.