The High Seas Forecast for the South Pacific

Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

593 FZPS40 PHFO 120307 HSFSP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 0530 UTC MON MAY 12 2025 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 MAY 12 2025. 24 HOUR FORECAST VALID 0000 UTC MAY 13 2025. 48 HOUR FORECAST VALID 0000 UTC MAY 14 2025. .WARNINGS. ...GALE WARNING... .LOW NEAR 20S177W 1000 MB MOVING ESE 25 KT. TROUGH FROM 25S146W TO 18S150W TO 17S166W THENCE WARM FRONT TO 21S170W TO LOW. WARM FRONT MOVING SE 20 KT AND TROUGH MOVING S 15 KT. COLD FRONT FROM LOW TO 15S177E TO 12S169E THENCE TROUGH TO 11S160E. COLD FRONT MOVING E 15 KT E OF 176E AND MOVING NE 10 KT ELSEWHERE. TROUGH NEARLY STATIONARY. WINDS 30 TO 40 KT FROM 24S TO 19S BETWEEN 179E TO 169W. WINDS 20 TO 30 KT ELSEWHERE S OF LINE 25S166W 17S166W 11S176E 19S177E 18S160E. SEAS 18 TO 21 FT FROM 23S TO 20S BETWEEN 177E AND 176W. SEAS 12 TO 18 FT ELSEWHERE S OF LINE 25S175W 20S170W 17S175E 17S171E 25S165E. SEAS 8 TO 12 FT ELSEWHERE S OF LINE 25S166W 17S166W 12S178E 18S178W 19S178E 15S176E 15S168E 19S169E 22S166E 19S163E 14S164E 13S160E. ISOLATED MODERATE TSTMS WITHIN 270 NM OF COLD FRONT AND WARM FRONT...WITHIN 300 NM OF TROUGH ASSOCIATED WITH WARM FRONT...AND FROM 15S TO 04S W OF 166E. .24 HOUR FORECAST LOW NEAR 24S163W 1002 MB. TROUGH FROM 21S151W TO 20S155W THENCE WARM FRONT TO 24S159W TO LOW. COLD FRONT FROM LOW TO 18S171W TO 13S179E THENCE TROUGH 10S168E 11S160E. WINDS 30 TO 35 KT S OF 20S BETWEEN 167W AND 160W. WINDS 20 TO 30 KT ELSEWHERE S OF LINE 25S154W 21S155W 13S173W 18S168E 25S179E. SEAS 12 TO 16 FT S OF LINE 25S169W 18S168W 15S172W 19S174W 18S171E 25S169E. SEAS 8 TO 12 FT ELSEWHERE S OF LINE 25S160W 15S167W 12S177W 18S178W 18S177E 14S174E 15S168E 20S160E. .48 HOUR FORECAST LOW AND WARM FRONT WITH ASSOCIATED TROUGH MOVED S OF AREA. COLD FRONT 25S154W 18S166W 15S171W THENCE TROUGH 10S173E 13S160E. WINDS 20 TO 30 KT S OF LINE 25S146W 13S169W 14S170W 22S170W 25S157W. SEAS 8 TO 12 FT S OF LINE 25S153W 13S165W 19S179E 13S169E 22S168E 23S160E. .SYNOPSIS AND FORECAST. .TROUGH 09S140W 06S150W MOVING W 10 KT. ISOLATED MODERATE TSTMS WITHIN 180 NM OF TROUGH. .24 HOUR FORECAST TROUGH 11S147W 06S150W. .48 HOUR FORECAST TROUGH 12S152W 07S155W. .SE TO E WINDS 20 TO 25 KT S OF 23S E OF 127W. .24 HOUR FORECAST SE TO E WINDS 20 TO 25 KT S OF 23S E OF 126W. .48 HOUR FORECAST WINDS EASED TO 20 KT OR LESS. .ELSEWHERE...WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA. .SEAS 8 TO 12 FT S OF 19S E OF 146W. .24 HOUR FORECAST SEAS 8 TO 11 FT S OF 10S E OF 134W. .48 HOUR FORECAST SEAS 8 TO 10 FT S OF 04S E OF 126W. .ELSEWHERE...SEAS 8 FT OR LOWER OVER REMAINDER OF FORECAST AREA. $$ .FORECASTER TROTTER. HONOLULU HI.