The High Seas Forecast for the Central North Pacific

High Seas Forecast Issued: 05/21/2025 01:03:10 PM UTC
                        
747
FZPN40 PHFO 210303
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC WED MAY 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC MAY 21 2025.
24 HOUR FORECAST VALID 0000 UTC MAY 22 2025.
48 HOUR FORECAST VALID 0000 UTC MAY 23 2025.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 23N174E 1010 MB MOVING W SLOWLY. TROUGH 30N177E 26N174E TO LOW
TO 19N174E 16N169E 16N160E MOVING W SLOWLY N OF 20N...AND S SLOWLY
ELSEWHERE. E TO SE WINDS 20 TO 30 KT N OF 20N BETWEEN 175W AND 179E.
N TO NE WINDS 20 TO 30 KT N OF 25N BETWEEN TROUGH AND 169E. NUMEROUS
MODERATE TSTMS FROM 21N TO 26N BETWEEN 180E AND 171E. SCATTERED
MODERATE TSTMS N OF 19N BETWEEN 175W AND 180E.
.24 HOUR FORECAST LOW NEAR 23N173E 1009 MB. TROUGH 30N173E TO
LOW TO 17N173E 15N169E. WINDS 20 TO 30 KT N OF LINE 20N164W 20N179W
30N174E.
.48 HOUR FORECAST LOW 23N167E 1009 MB. TROUGH 30N171E TO LOW TO
16N164E. WINDS 20 TO 30 KT N OF LINE 20N150W 20N175W 30N172E.

.NE WINDS 20 TO 25 KT FROM 18N TO 28N E OF 147W.
.24 HOUR FORECAST NE TO E WINDS 20 TO 25 KT FROM
06N TO 12N E OF 145W.
.48 HOUR FORECAST NE TO E WINDS 20 TO 25 KT FROM
06N TO 15N E OF 164W.

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

.SEAS 2.5 TO 4 M N OF LINE 25N175W 16N167E 16N160E. SEAS 2.5 TO
3 M FROM 02N TO 12N E OF 173W...AND FROM 15N TO 27N E OF 150W.
.24 HOUR FORECAST SEAS MAINLY 2.5 TO 3.5 M N OF 20N BETWEEN 164W
AND 164E...AND FROM 05N TO 11N E OF 174W.
.48 HOUR FORECAST SEAS 2.5 TO 3.5 M N OF LINE 20N140W 20N179W
30N169E...AND FROM 05N TO 12N W OF 169E.

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

.ISOLATED MODERATE TSTMS FROM 05N TO 10N BETWEEN 180E AND 174E.

.ITCZ 06N140W 04N148W 05N162W 02N175W. ISOLATED MODERATE TSTMS
WITHIN 180 NM OF ITCZ.

$$

.FORECASTER AHUE. HONOLULU HI.