High Seas Forecast
Issued by NWS
Issued by NWS
138 FZPN40 PHFO 211530 HSFNP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 1700 UTC SAT SEP 21 2024 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 21 2024. 24 HOUR FORECAST VALID 1200 UTC SEP 22 2024. 48 HOUR FORECAST VALID 1200 UTC SEP 23 2024. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .TROUGH 15N175E 14N167E 12N160E NEARLY STATIONARY AND ERODING FROM THE E. SCATTERED MODERATE TSTMS S OF 15N AND N OF LINE 03N160E 04N170E 10N175E 14N175E. .24 HOUR FORECAST TROUGH 13N168E 12N160E. .48 HOUR FORECAST TROUGH DISSIPATED WITHIN FORECAST AREA. .TROUGH 30N180W 24N179W 18N179E MOVING W SLOWLY. ISOLATED MODERATE TSTMS WITHIN 120 NM OF TROUGH BETWEEN 23N AND 27...AND IN AREA 22N174W 16N174W 10N175E 14N175E 22N174W. .24 HOUR FORECAST WEAKENING TROUGH 28N177E 20N177E. .48 HOUR FORECAST TROUGH DISSIPATED. .TROUGH 30N149W 24N146W MOVING W SLOWLY. .24 HOUR FORECAST DISSIPATING TROUGH 29N151W 23N150W. .48 HOUR FORECAST TROUGH DISSIPATED. .LOW NEAR 07N159W 1009 MB MOVING W SLOWLY. ISOLATED MODERATE TSTMS WITHIN 150 NM OF LOW. .24 HOUR FORECAST LOW NEAR 09N162W 1009 MB. .48 HOUR FORECAST LOW NEAR 09N167W 1008 MB. .24 HOUR FORECAST NEW LOW NEAR 12N141W 1007 MB. WINDS 20 TO 25 KT WITHIN 150 NM OF LOW. .48 HOUR FORECAST LOW NEAR 12N144W 1006 MB. WINDS 20 TO 25 KT FROM 18N TO 13N E OF 148W. SEAS 8 TO 9 FT FROM 16N TO 13N BETWEEN 146W AND 142W. .WINDS 20 KT OR LESS REMAINDER FORECAST AREA. .SEAS 8 FT OR LOWER REMAINDER FORECAST AREA. .MONSOON TROUGH 10N157W 09N141W. ISOLATED MODERATE TSTMS WITHIN 120 NM OF MONSOON TROUGH. $$ .FORECASTER POWELL. HONOLULU HI.