OPC East and Central N Pacific High Seas Forecast
by Ocean Prediction Center web team 12 Aug 2026 at 11:26am FZPN02 KWBC 121725 HSFEPI HIGH SEAS FORECAST FOR METAREA XII NWS OCEAN PREDICTION CENTER WASHINGTON DC 1745 UTC WED AUG 12 2026 CCODE/1:31:12:01:00/AOW+POR/NWS/CCODE SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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. ONLY YOU KNOW THE WEATHER AT YOUR POSITION. REPORT IT TO THE NATIONAL WEATHER SERVICE. EMAIL US AT VOSOPS@NOAA.GOV(LOWERCASE). FOR ANY TROPICAL CYCLONE INFORMATION BEYOND 48 HOURS REFERENCE THE ASSOCIATED NWS TROPICAL CYCLONE FORECAST/ADVISORY (TCM). SECURITE PACIFIC S OF 67N AND N OF 30N E OF A LINE FROM THE BERING STRAIT TO 53N172E TO 50N180W TO 30N180W ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS SYNOPSIS VALID 1200 UTC AUG 12. 24 HOUR FORECAST VALID 1200 UTC AUG 13. 48 HOUR FORECAST VALID 1200 UTC AUG 14. .WARNINGS. ...GALE WARNING... .FROM 32N TO 42N BETWEEN 123W AND A LINE FROM 32N132W TO 42N127W AREA OF N TO NW WINDS 20 TO 30 KT. SEAS TO 3.5 M. .12 HOUR FORECAST FROM 41N TO 42N E OF 125W AREA OF N WINDS 25 TO 35 KT. SEAS 3 TO 4 M. .24 HOUR FORECAST FROM 33N TO 42N BETWEEN 129W AND 122W AREA OF N TO NW WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M. .48 HOUR FORECAST CONDITIONS DIMINISHED. ...GALE WARNING... .24 HOUR FORECAST LOW W OF AREA 38N173E 1001 MB. FROM 30N TO 39N BETWEEN 180W AND 177W WINDS 20 TO 30 KT. SEAS TO 3 M. .36 HOUR FORECAST LOW W OF AREA NEAR 39N177E 999 MB. FROM 32N TO 39N BETWEEN 180W AND 177W WINDS 25 TO 35 KT. SEAS 3 TO 4 M. .48 HOUR FORECAST COMPLEX LOW WITH MEAN CENTER W OF AREA NEAR 40N179E 996 MB. FROM 37N TO 41N BETWEEN 176W AND 173W WINDS 30 TO 40 KT. SEAS 3 TO 4.5 M. ELSEWHERE WITHIN AN AREA BOUNDED BY A LINE FROM 30N180W TO 30N174W TO 41N170W TO 45N180W TO 30N180W WINDS 20 TO 30 KT. SEAS 2.5 TO 4.5 M. .SYNOPSIS AND FORECAST. .LOW 55N178W 1000 MB MOVING SE 15 KT. WITHIN AN AREA BOUNDED BY A LINE FROM 52N177E TO 51N172W TO 54N171W TO 60N176W TO 56N175E TO 52N177E WINDS 20 TO 30 KT. SEAS TO 3 M. .24 HOUR FORECAST LOW 56N175W 998 MB. WITHIN 180 NM SW QUADRANT WINDS TO 25 KT. SEAS LESS THAN 2.5 M. .48 HOUR FORECAST LOW 54N176W 1000 MB. CONDITIONS DIMINISHED. .LOW 45N162W 1001 MB MOVING NE 10 KT. FRONT FROM 49N157W TO 44N156W TO 37N158W. WITHIN 300 NM SW AND S QUADRANTS...AND WITHIN 90 NM W AND 300 NM E OF FRONT...WINDS 20 TO 30 KT. SEAS TO 3.5 M. .24 HOUR FORECAST LOW 49N157W 1005 MB. FROM 41N TO 53N BETWEEN 160W AND 147W WINDS TO 25 KT. SEAS TO 3 M. ALSO WITHIN 240 NM NE OF A LINE FROM 59N165W TO 56N155W WINDS 20 TO 30 KT. SEAS LESS THAN 2.5 M. .48 HOUR FORECAST LOW 54N161W 1009 MB. CONDITIONS DIMINISHED. .24 HOUR FORECAST E OF A LINE FROM 54N136W TO 48N130W AREA OF NW WINDS 20 TO 30 KT. SEAS TO 2.5 M. .48 HOUR FORECAST CONDITIONS DIMINISHED. .DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN AN AREA BOUNDED BY A LINE FROM 46N163W TO 46N135W TO 54N149W TO 54N163W TO 46N163W...AND WITHIN 60 NM EITHER SIDE OF A LINE FROM 54N177W TO 51N176W TO 47N180W. .24 HOUR FORECAST DENSE FOG WITHIN AN AREA BOUNDED BY A LINE FROM 48N157W TO 47N138W TO 59N148W TO 60N172W TO 58N175W TO 48N157W...AND FROM 52N TO 57N W OF 176E. .48 HOUR FORECAST DENSE FOG WITHIN 90 NM EITHER SIDE OF A LINE FROM 61N172W TO 55N165W...AND WITHIN 120 NM EITHER SIDE OF A LINE FROM 59N152W TO 48N140W. .FORECASTER CONNELLY. OCEAN PREDICTION CENTER. NWS NATIONAL HURRICANE CENTER MIAMI FL E PACIFIC FROM THE EQUATOR TO 30N E OF 140W AND 03.4S TO THE EQUATOR E OF 120W SYNOPSIS VALID 1200 UTC WED AUG 12. 24 HOUR FORECAST VALID 1200 UTC THU AUG 13. 48 HOUR FORECAST VALID 1200 UTC FRI AUG 14. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .PTC ONE-C WEST OF AREA NEAR 15N141.8W. OVER FORECAST WATERS WITHIN 20N136W TO 24N140W TO 03N140W TO 06N135W TO 10N134W TO 20N136W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M. .24 HOUR FORECAST PTC ONE-C WEST OF AREA NEAR 15.9N144.1W. OVER FORECAST WATERS WITHIN 25N136W TO 28N140W TO 09N140W TO 12N137W TO 25N136W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0 M IN SE SWELL. .48 HOUR FORECAST PTC ONE-C WEST OF AREA NEAR 17.9N148.3W. OVER FORECAST WATERS WITHIN 25N136W TO 28N140W TO 09N140W TO 12N137W TO 25N136W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S SWELL. .LOW PRES NEAR 17.5N130.5W 1008 MB. WITHIN 21N129W TO 20N132W TO 18N133W TO 18N131W TO 18N129W TO 21N129W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE TO S SWELL. .24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 19N132.5W 1006 MB. WITHIN 21N131W TO 23N133W TO 21N135W TO 17N135W TO 15N134W TO 18N131W TO 21N131W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0 M. .48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 18N133W 1007 MB. WITHIN 22N129W TO 24N135W TO 17N134W TO 17N132W TO 20N128W TO 22N129W WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0 M IN N SWELL. .WITHIN 15N94W TO 16N94W TO 16N96W TO 13N96W TO 13N95W TO 14N94W TO 15N94W...INCLUDING THE GULF OF TEHUANTEPEC... N WINDS 20 TO 25 KT. SEAS TO 2.5 M. .24 HOUR FORECAST WITHIN 16N94W TO 16N95W TO 16N96W TO 14N96W TO 14N95W TO 15N94W TO 16N94W...INCLUDING THE GULF OF TEHUANTEPEC... N WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M. .48 HOUR FORECAST LITTLE CHANGE. .WITHIN 11N86W TO 12N87W TO 11N88W TO 10N88W TO 09N87W TO 10N85W TO 11N86W...INCLUDING THE GULF OF PAPAGAYO... NE WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M. .24 HOUR FORECAST LITTLE CHANGE. .48 HOUR FORECAST LITTLE CHANGE. .WITHIN 01N110W TO 03N118W TO 00N132W TO 01S120W TO 03.4S120W TO 03.4S106W TO 01N110W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL. .24 HOUR FORECAST WITHIN 06N108W TO 05N119W TO 00N132W TO 03.4S120W TO 03.4S98W TO 06N108W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL. .48 HOUR FORECAST WITHIN 05N100W TO 06N110W TO 00N128W TO 03.4S120W TO 03.4S91W TO 05N100W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL. .REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M. CONVECTION VALID AT 1500 UTC WED AUG 12... LOW PRES NEAR 17.5N130.5W...SCATTERED MODERATE TO STRONG FROM 10N TO 20N BETWEEN 128W AND 140W. .INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... MONSOON TROUGH FROM 09N85W TO 08N105W. SCATTERED MODERATE FROM 03N TO 11N EAST OF 120W. .FORECASTER AL. NATIONAL HURRICANE CENTER. NATIONAL WEATHER SERVICE HONOLULU HI NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W SYNOPSIS VALID 1200 UTC AUG 12 2026. 24 HOUR FORECAST VALID 1200 UTC AUG 13 2026. 48 HOUR FORECAST VALID 1200 UTC AUG 14 2026. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST .LOW 15N141W 1004 MB MOVING W 10 KT. WINDS 20 TO 30 KT AND SEAS 2.5 TO 4 M FROM 08N TO 20N E OF 145W. .24 HOUR FORECAST LOW 16N144W 1000 MB. WINDS 20 TO 30 KT FROM 10N TO 22N E OF 140W. SEAS 4 TO 5 M WITHIN 180 NM OF N SEMICIRCLE. SEAS 2.5 TO 4 M ELSEWHERE FROM 10N TO 22N E OF 140W. POSSIBLE TROPICAL CYCLONE. .48 HOUR FORECAST LOW 16N147W 998 MB. WINDS 20 TO 30 KT FROM 15N TO 25N BETWEEN 153W AND 143W. SEAS 4 TO 5.5 M WITHIN 210 NM OF LOW. SEAS 2.5 TO 4 M ELSEWHERE WITHIN 600 NM OF LOW. POSSIBLE TROPICAL CYCLONE. .TROUGH 18N177W 15N175W 11N175W MOVING W 10 KT. .24 HOUR FORECAST TROUGH MOVED W OF AREA. .WINDS 20 KT OR LESS OVER THE REMAINDER OF FORECAST AREA. .SEAS 2.5 M OR LOWER OVER THE REMAINDER OF FORECAST AREA. .MONSOON TROUGH 06N180W 08N165W 07N155W 10N143W 14N140W. NUMEROUS STRONG TSTMS WITHIN 240 NM OF LINE 06N148W 12N142W. SCATTERED MODERATE TSTMS ELSEWHERE WITHIN 150 NM OF TROUGH E OF 165W. $$ .FORECASTER PECHACEK. HONOLULU HI. See NWS for further details |