FZPN40 PHFO 192139

HSFNP 



HIGH SEAS FORECAST

NATIONAL WEATHER SERVICE HONOLULU HI

2300 UTC TUE AUG 19 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC AUG 19 2025.

24 HOUR FORECAST VALID 1800 UTC AUG 20 2025.

48 HOUR FORECAST VALID 1800 UTC AUG 21 2025.



.WARNINGS.



.NONE.



.SYNOPSIS AND FORECAST. 



TROUGH FROM 30N143W TO 27N147W MOVING W SLOWLY.

.24 HOUR FORECAST TROUGH MOVED N OF AREA.



.TROUGH FROM 30N172W TO 28N173W MOVING NW SLOWLY. ISOLATED MODERATE 

TSTMS N OF 27N BETWEEN 165W AND 169W.

.24 HOUR FORECAST TROUGH FROM 30N176W TO 28N180E.

.48 HOUR FORECAST TROUGH FROM DISSIPATED.



.TROUGH FROM 30N173E TO 26N170E NEARLY STATIONARY. ISOLATED 

MODERATE TSTMS WITHIN 90 NM OF TROUGH...AND N OF 27N BETWEEN 179E 

AND 177E.

.24 HOUR FORECAST TROUGH FROM 30N175E TO 27N172E.

.48 HOUR FORECAST TROUGH FROM 30N173E TO 26N171E.



.TROUGH FROM 30N164E TO 27N160E MOVING NW SLOWLY. ISOLATED MODERATE 

TSTMS WITHIN 90 NM OF TROUGH...AND WITHIN 90 NM OF POINT 29N167E. 

.24 HOUR FORECAST TROUGH MOVED N OF AREA. 

.48 HOUR FORECAST TROUGH FROM 30N161E TO 29N160E.



.24 HOUR FORECAST NEW TROUGH FROM 11N162W TO 07N165W. WINDS 20 TO 

25 KT FROM 11N TO 16N BETWEEN 160W AND 167W.

.48 HOUR FORECAST TROUGH FROM 11N169W TO 06N172W. WINDS 20 TO 25 KT 

AND SEAS 2.5 TO 3 M FROM 11N TO 15N BETWEEN 165W AND 175W.



.24 HOUR FORECAST NEW TROUGH FROM 13N144W TO 10N147W. WINDS 20 TO 

25 KT FROM 12N TO 16N E OF 148W.

.48 HOUR FORECAST TROUGH FROM 14N147W TO 10N152W. WINDS 20 TO 25 KT 

AND SEAS 2.5 TO 3 M FROM 12N TO 17N BETWEEN 143W AND 153W. 



.WINDS 20 KT OR LESS AND SEAS 2.5 M OR LOWER OVER REMAINDER OF 

FORECAST AREA. 



.MONSOON TROUGH FROM 11N140W TO 09N154W THENCE ITCZ TO 10N177W TO 

06N160E. ISOLATED MODERATE TSTMS WITHIN 150 NM OF MONSOON TROUGH... 

AND ISOLATED MODERATE TSTMS WITHIN 180 NM OF ITCZ.



$$



.FORECASTER WROE. HONOLULU HI.