High Seas Forecast
Issued by NWS
Issued by NWS
048 FZPS40 PHFO 171508 HSFSP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 1730 UTC THU APR 17 2025 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 1200 UTC APR 17 2025. 24 HOUR FORECAST VALID 1200 UTC APR 18 2025. 48 HOUR FORECAST VALID 1200 UTC APR 19 2025. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .FRONT 25S146W 17S151W THENCE TROUGH 11S160W 04S169W MOVING E 15 KT. NW TO N WINDS S OF 23S BETWEEN 133W AND FRONT. SCATTERED MODERATE TSTMS WITHIN 300 NM E OF FRONT AND TROUGH...AND MODERATE TSTMS WITHIN 150 NM W OF TROUGH. .24 HOUR FORECAST FRONT 25S139W 18S146W THENCE TROUGH 14S157W. ASSOCIATED WINDS MOVED S OF AREA. .48 HOUR FORECAST FRONT WEAKENED TO TROUGH 25S136W 16S151W. .TROUGH 25S179E 20S177E 13S160E MOVING NE SLOWLY. ISOLATED MODERATE TSTMS WITHIN 270 NM OF TROUGH. .24 HOUR FORECAST TROUGH 25S178E 21S177E 18S170E 12S160E. NE WINDS 20 TO 25 KT S OF LINE 25S157W 18S167W 25S176W...AND S OF 20S BETWEEN 178W AND TROUGH. .48 HOUR FORECAST NEW LOW NEAR 20S179W 1007 MB MOVING SE 10 KT. TROUGH 25S179E TO LOW TO 11S160E. WINDS 20 TO 30 KT S OF 17S BETWEEN 144W AND TROUGH. .SEAS 8 TO 12 FT S OF 22S W OF 174W. SEAS 8 TO 11 FT S OF LINE 25S169W 20S163W 18S148W 17S130W 06S129W 07S120W. .24 HOUR FORECAST SEAS 8 TO 12 FT S OF LINE 18S160E 24S179E 16S165W 20S150W 19S136W 08S131W 04S120W. .48 HOUR FORECAST SEAS 12 TO 14 FT S OF 18S BETWEEN 148W AND 166W. SEAS 8 TO 12 FT ELSEWHERE S OF LINE 22S160E 22S170E 25S176E 19S178W 14S167W 14S153W 19S136W 09S136W 05S120W. .REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS 8 FT OR LESS. .ITCZ 03S125W 06S138W 06S151W. SCATTERED MODERATE TSTMS WITHIN 120 NM OF ITCZ. .ISOLATED MODERATE TSTMS FROM 10S TO 02S W OF 171E. $$ .FORECASTER PIERCE. HONOLULU HI.