High Seas Forecast
Issued by NWS
Issued by NWS
770 FZPS40 PHFO 190308 HSFSP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 0530 UTC TUE AUG 19 2025 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 SOUTH PACIFIC EQUATOR TO 25S BETWEEN 120W AND 160E SYNOPSIS VALID 0000 UTC AUG 19 2025. 24 HOUR FORECAST VALID 0000 UTC AUG 20 2025. 48 HOUR FORECAST VALID 0000 UTC AUG 21 2025. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .FRONT 25S164W 23S165W 21S167W 18S172W 15S180W THENCE TROUGH 13S172E 13S169E 05S160E. FRONT MOVING SE SLOWLY. TROUGH MOVING W SLOWLY. .24 HOUR FORECAST FRONT 25S162W 19S167W 15S174W. TROUGH DISSIPATED. .48 HOUR FORECAST FRONT WEAKENED TO A TROUGH 25S159W 19S166W 15S169W. .FRONT 25S135W 23S136W 19S139W 15S146W 10S157W THENCE TROUGH 09S162W 09S168W 09S172W MOVING W SLOWLY. ISOLATED MODERATE TSTMS WITHIN 150 NM W OF FRONT S OF 17S. .24 HOUR FORECAST FRONT WEAKENED TO TROUGH 25S137W 21S137W 18S143W 14S146W. .48 HOUR FORECAST TROUGH 23S141W 19S147W 19S159W. .TROUGH 19S170E 19S168E 13S164E NEARLY STATIONARY. .24 HOUR FORECAST TROUGH 21S166E 20S160E. .48 HOUR FORECAST TROUGH 22S172E 20S160E. .24 HOUR FORECAST NEW TROUGH 14S152W 06S166W. .48 HOUR FORECAST TROUGH 15S158W 09S168W 04S177W. .24 HOUR FORECAST SE WINDS 20 TO 30 KT WITHIN AN AREA BOUNDED BY 15S170W 23S160E 15S160E 06S175W 15S170W. .48 HOUR FORECAST SE WINDS 20 TO 30 KT WITHIN AN AREA BOUNDED BY 16S172W 21S160E 12S160E 08S172E 09S175W 16S172W. .WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA. .SEAS 3 TO 4 M S OF 22S BETWEEN 136W AND 148W. SEAS 2.5 TO 3 M ELSEWHERE S OF A LINE 06S120W 11S132W 19S135W 16S155W. .24 HOUR FORECAST SEAS 2.5 TO 3 M S OF LINE 01S120W 08S134W 17S140W 18S152W...AND S OF 23S BETWEEN 180E AND 170E. .48 HOUR FORECAST SEAS 2.5 TO 3.5 M S OF A LINE 25S168W 18S178W 06S178E 10S160E...SEAS 2.5 TO 3 M S OF A LINE 00S130W 06S138W 17S138W 19S148W. .SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA. .NUMEROUS MODERATE TSTMS N OF 08S W OF 164E. ISOLATED MODERATE TSTMS FROM 13S TO 10S BETWEEN 172W AND 180E. $$ .FORECASTER TSAMOUS. HONOLULU HI.