High Seas Forecast
Issued by NWS
Issued by NWS
937 FZPN40 PHFO 191526 HSFNP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 1700 UTC THU SEP 19 2024 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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. THE NATIONAL WEATHER SERVICE IS ACCEPTING PUBLIC COMMENTS UNTIL OCTOBER 16 2024 ON A PROPOSAL TO REPLACE FEET WITH METERS WHEN DESCRIBING SEAS IN A VARIETY OF NATIONAL MARINE CENTER TEXT AND GRAPHICAL PRODUCTS FOR THE OFFSHORE AND HIGH SEAS AREAS ONLY. TO LEARN MORE PLEASE VISIT HTTPS://OCEAN.WEATHER.GOV/PROPOSED-METERS.PHP SECURITE NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E SYNOPSIS VALID 1200 UTC SEP 19 2024. 24 HOUR FORECAST VALID 1200 UTC SEP 20 2024. 48 HOUR FORECAST VALID 1200 UTC SEP 21 2024. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .24 HOUR FORECAST NEW TROUGH FROM 09N170E TO 11N177E TO 15N177W TO 18N172W. WINDS E TO S 20 TO 25 KT WITHIN 150 NM SE AND S OF TROUGH AXIS W OF 177W. .48 HOUR FORECAST NEW LOW NEAR 15N179E 1012 MB. TROUGHS FROM LOW TO 18N172W AND FROM LOW TO 13N172E TO 09N165E. WINDS 20 TO 25 KT WITHIN 240 NM OF LOW NE SEMICIRCLE. .TROUGH FROM 15N178E TO 19N177W TO 21N172W MOVING NW 10 KT. .24 HOUR FORECAST TROUGH DISSIPATED. .24 HOUR FORECAST NEW TROUGH FROM 26N140W TO 30N146W. .48 HOUR FORECAST TROUGH FROM 24N145W TO 30N150W. .OTHERWISE WINDS E TO NE 20 TO 25 KT FROM 17N TO 09N BETWEEN 165E AND 175E AND ALSO FROM 30N TO 24N BETWEEN 171W AND 159W. ADDITIONALLY WINDS NE TO S 20 TO 25 KT FROM 16N TO 02N BETWEEN 172W AND 164W. .24 HOUR FORECAST WINDS DIMINISHED TO 20 KT OR LESS...EXCEPT HIGHER WHERE NOTED ABOVE. .WINDS 20 KT OR LESS REMAINDER FORECAST AREA. .OTHERWISE SEAS 8 TO 9 FT FROM 16N TO 04N BETWEEN 174W AND 164W. .24 HOUR FORECAST SEAS SUBSIDED TO 8 FT OR LOWER EXCEPT GREATER WHERE NOTED ABOVE. .SEAS 8 FT OR LOWER REMAINDER FORECAST AREA. .MONSOON TROUGH FROM 11N140W TO 11N146W TO 08N153W. ISOLATED MODERATE TSTMS WITHIN 240 NM EITHER SIDE OF TROUGH AXIS. .ITCZ FROM 11N160W TO 12N168W TO 07N178W TO 08N168E. ISOLATED MODERATE TO STRONG TSTMS WITHIN 360 NM EITHER SIDE OF CONVERGENCE LINE. .OTHERWISE SCATTERED MODERATE TSTMS FROM 30N TO 26N BETWEEN 172W AND 166W. $$ .FORECASTER BEDAL. HONOLULU HI.