


High Seas Forecast
Issued by NWS
Issued by NWS
734 FZPN40 PHFO 100321 HSFNP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 0500 UTC FRI OCT 10 2025 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 OCT 10 2025. 24 HOUR FORECAST VALID 0000 UTC OCT 11 2025. 48 HOUR FORECAST VALID 0000 UTC OCT 12 2025. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .TROUGH 30N149W 26N154W 21N165W NEARLY STATIONARY. ISOLATED MODERATE TSTMS WITHIN 150 NM OF TROUGH N OF 24N. .24 HOUR FORECAST TROUGH 30N152W 25N161W 21N167W. .48 HOUR FORECAST TROUGH 30N152W 23N159W. .TROUGH 27N176W 22N176W 18N172W MOVING W SLOWLY. .24 HOUR FORECAST TROUGH DISSIPATED. .LOW NEAR 12N162W 1009 MB. TROUGH FROM 17N159W TO LOW TO 06N177E. LOW AND TROUGH MOVING NW SLOWLY. ISOLATED MODERATE TSTMS WITHIN 210 NM OF LOW AND TROUGH. .24 HOUR FORECAST LOW NEAR 13N164W 1011 MB. TROUGH FROM 17N161W TO LOW TO 09N176E. .48 HOUR FORECAST LOW DISSIPATED. TROUGH 16N168W 10N169W 06N177E. .TROUGH 30N173E 27N167E MOVING E 10 KT. .24 HOUR FORECAST TROUGH ABSORBED BY FRONT DESCRIBED BELOW. .24 HOUR FORECAST NEW FRONT 30N167E 26N160E. WINDS 20 TO 25 KT N OF 28N BETWEEN 164E AND 176E. SEAS 4 TO 5 M N OF A LINE 30N168E 28N162E 28N160E. SEAS 2.5 TO 4 M ELSEWHERE N OF A LINE 30N170E 27N164E 25N160E. .48 HOUR FORECAST FRONT 30N174E 25N160E. ASSOCIATED WINDS MOVED N OF AREA. SEAS 4 TO 5 M N OF A LINE 30N177E 25N171E 26N160E. SEAS 2.5 TO 4 M ELSEWHERE N OF A LINE 30N174W 25N176E 20N169E 20N160E. .WINDS 20 KT OR LESS AND SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA. .ITCZ 09N140W 11N154W...AND 06N175E 06N167E 04N160E. ISOLATED MODERATE TSTMS WITHIN 180 NM OF ITCZ W OF 148W. $$ .FORECASTER TROTTER. HONOLULU HI.