The High Seas Forecast for the Central North Pacific

High Seas Forecast Issued: 05/19/2026 01:06:57 AM UTC
                        
926
FZPN40 PHFO 181506
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC MAY 18 2026.
24 HOUR FORECAST VALID 1200 UTC MAY 19 2026.
48 HOUR FORECAST VALID 1200 UTC MAY 20 2026.

.WARNINGS.



.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 30N176W 29N178W 29N180W NEARLY STATIONARY.
.24 HOUR FORECAST TROUGH MOVED N OF AREA.

.TROUGH 30N171W 27N173W 24N174W NEARLY STATIONARY.
.24 HOUR FORECAST TROUGH 30N170W 27N172W 21N172W.
.48 HOUR FORECAST TROUGH 30N167W 27N173W 24N176W.

.WINDS 20 TO 25 KT FROM 07N TO 15N E OF 161W.
.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 30N151W
30N140W 08N140W 10N173W 30N151W.

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

.SEAS 2.5 TO 3.5 M FROM 07N TO 22N E OF 160W.
.24 HOUR FORECAST SEAS 2.5 TO 3.5 M FROM 07N TO 19N E OF
165W...AND FROM 19N TO 29N E OF 152W.
.48 HOUR FORECAST SEAS 2.5 TO 3.5 M IN AREA BOUNDED BY 30N152W
30N140W 07N140W 09N171W 30N152W.

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

.ITCZ 08N140W 08N144W 06N152W 05N158W 02N164W...AND 08N170W
09N173W 04N180W. SCATTERED MODERATE TSTMS WITHIN 240 NM OF ITCZ
BETWEEN 152W AND 162W. ISOLATED MODERATE TSTMS ELSEWHERE WITHIN
210 NM N OF ITCZ AND S OF ITCZ.



$$

.FORECASTER TSAMOUS. HONOLULU HI.