HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2345 UTC TUE AUG 11 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC AUG 11.
24 HOUR FORECAST VALID 1800 UTC AUG 12.
48 HOUR FORECAST VALID 1800 UTC AUG 13.
.WARNINGS.
...GALE WARNING...
.LOW 56N176E 1002 MB MOVING E 15 KT TURNING SE AFTER 12 HOURS.
WITHIN 300 NM SE SEMICIRCLE WINDS 25 TO 35 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW 54N177W 1001 MB. WITHIN 240 NM SW
SEMICIRCLE...AND WITHIN 180 NM E OF A FRONT FROM 60N177W TO
56N177W TO 51N173W...WINDS 20 TO 30 KT. SEAS TO 3.5 M.
.48 HOUR FORECAST LOW 55N174W 1002 MB. FROM 54N TO 59N BETWEEN
178E AND 176W WINDS TO 25 KT. SEAS TO 3 M.
...GALE WARNING...
.FROM 35N TO 43N BETWEEN 123W AND A LINE FROM 35N131W TO 43N126W
AREA OF N TO NW WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M.
.06 HOUR FORECAST FROM 41N TO 42N E OF 125W AREA OF N TO NW
WINDS 25 TO 35 KT. SEAS 3 TO 4 M.
.24 HOUR FORECAST FROM 32N TO 43N BETWEEN 123W AND A LINE FROM
32N132W TO 43N127W AREA OF N TO NW WINDS 20 TO 30 KT. SEAS 2.5
TO 4 M.
.48 HOUR FORECAST FROM 35N TO 42N BETWEEN 129W AND 123W AREA OF
N TO NW WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M.
.SYNOPSIS AND FORECAST.
.COMPLEX LOW WITH MAIN CENTER 43N163W 1001 MB MOVING NE 10 KT.
WITHIN 180 NM NW SEMICIRCLE...AND WITHIN 120 NM EITHER SIDE OF A
LINE FROM 36N161W TO 44N155W...WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW 46N161W 1004 MB. WITHIN 360 NM SW AND S
QUADRANTS...AND FROM 38N TO 49N BETWEEN 159W AND 150W...WINDS TO
25 KT. SEAS TO 3.5 M. ALSO FROM 54N TO 57N BETWEEN 162W AND 152W
WINDS 20 TO 30 KT. SEAS LESS THAN 2.5 M.
.48 HOUR FORECAST LOW 50N157W 1007 MB. FROM 44N TO 48N BETWEEN
158W AND 153W...AND WITHIN 180 NM NE OF A LINE FROM 59N166W TO
54N156W...WINDS 20 TO 30 KT. SEAS TO 3 M.
.48 HOUR FORECAST NEW COMPLEX LOW WITH MEAN CENTER W OF AREA
NEAR 33N170E 998 MB. WITHIN AN AREA BOUNDED BY A LINE FROM
40N180W TO 37N175W TO 30N177W TO 30N180W TO 40N180W WINDS 20 TO
30 KT. SEAS 2.5 TO 4 M.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 46N TO 50N
BETWEEN 158W AND 143W...AND FROM 50N TO 58N W OF 179E.
.24 HOUR FORECAST DENSE FOG WITHIN AN AREA BOUNDED BY A LINE
FROM 46N163W TO 46N135W TO 55N148W TO 55N163W TO 46N163W.
.48 HOUR FORECAST DENSE FOG WITHIN AN AREA BOUNDED BY A LINE
FROM 48N157W TO 47N136W TO 60N153W TO 54N166W TO 48N157W...AND
FROM 51N TO 56N W OF 176E.
.FORECASTER CONNELLY. OCEAN PREDICTION CENTER.
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 1800 UTC TUE AUG 11.
24 HOUR FORECAST VALID 1800 UTC WED AUG 12.
48 HOUR FORECAST VALID 1800 UTC THU AUG 13.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.LOW PRES NEAR 15N137.5W 1006 MB. WITHIN 18N136W TO 20N140W TO
06N140W TO 10N135W TO 18N136W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0
M.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...W OF
AREA. OVER FORECAST WATERS WITHIN 23N138W TO 25N140W TO 07N140W
TO 11N135W TO 15N135W TO 23N138W WINDS 20 TO 30 KT. SEAS 2.5 TO
3.5 M.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...W OF
AREA. OVER FORECAST WATERS WITHIN 24N136W TO 28N138W TO 29N140W
TO
09N140W TO 13N136W TO 24N136W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5
M.
.LOW PRES NEAR 16N129W 1008 MB. WITHIN 19N128W TO 21N129W TO
20N133W
TO 15N133W TO 14N130W TO 16N128W TO 19N128W E WINDS 20 TO 25 KT.
SEAS 2.5 TO 3.0 M.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
18N132W 1007 MB. WITHIN 20N129W TO 23N131W TO 23N135W TO 21N136W
TO 16N133W TO 16N130W TO 20N129W WINDS 20 TO 30 KT. SEAS 2.5 TO
3.0 M.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
20N132W 1006 MB. WITHIN 23N130W TO 28N136W TO 21N135W TO 15N134W
TO 18N129W TO 23N130W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0 M.
.WITHIN 15N94W TO 16N94W TO 16N95W TO 16N96W TO 14N96W TO 13N94W
TO 15N94W...INCLUDING THE GULF OF TEHUANTEPEC... N WINDS 20 TO
25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS
LESS THAN 2.5 M.
.WITHIN 01N121W TO 02N129W TO 00N137W TO 03.4S120W TO 03.4S117W
TO 01S117W TO 01N121W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN
S SWELL.
.24 HOUR FORECAST WITHIN 01N106W TO 03N121W TO 00N130W TO
01S120W TO 03.4S120W TO 03S101W TO 01N106W WINDS 20 KT OR LESS.
SEAS 2.5 TO 3.0 M IN S TO SW SWELL.
.48 HOUR FORECAST WITHIN 04N105W TO 04N121W TO 00N131W TO
03.4S120W TO 03.4S95W TO 04N105W 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 2000 UTC TUE AUG 11...
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09.5N84W TO 06N102W TO LOW PRES NEAR
15N137.5W TO 13N140W. SCATTERED MODERATE ISOLATED STRONG FROM
03N TO 09N BETWEEN 87W AND 109W...FROM 04N TO 17N BETWEEN 112W
AND 120W...FROM 12N TO 19N BETWEEN 126W AND 134W...AND FROM 05N
TO 17N BETWEEN 134W AND 140W.
$$
.FORECASTER AL. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W
SYNOPSIS VALID 1800 UTC AUG 11 2026.
24 HOUR FORECAST VALID 1800 UTC AUG 12 2026.
48 HOUR FORECAST VALID 1800 UTC AUG 13 2026.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST
.LOW W OF AREA NEAR 15N137W 1008 MB NEARLY STATIONARY.
.24 HOUR FORECAST LOW 14N141W 1004 MB. TROPICAL CYCLONE POSSIBLE.
WINDS 20 TO 30 KT FROM 08N TO 20N E OF 147W. SEAS 3.5 TO 4 M FROM
14N TO 16N E OF 18W...AND SEAS 2.5 TO 3.5 M ELSEWHERE FROM 08N TO
20N E OF 148W
.48 HOUR FORECAST LOW 16N145W 1000 MB. TROPICAL CYCLONE POSSIBLE.
WINDS 20 TO 30 KT E OF 150W. SEAS 3.5 TO 4.5 M WITHIN 120 NM OF
NW SEMICIRCLE FROM LOW. SEAS 2.5 TO 3.5 M ELSEWHERE FROM 08N TO
22N E OF 150W.
.TROUGH 09N177W TO 15N177W MOVING W 10 KT.
.24 HOUR FORECAST TROUGH MOVED W OF AREA.
.LOW 10N163W 1010 MB MOVING W SLOWLY.
.24 HOUR FORECAST LOW 09N163W 109 MB.
.48 HOUR FORECAST LOW ABSORBED INTO MONSOON TROUGH.
.WINDS 20 KT OR LESS OVER THE REMAINDER OF FORECAST AREA.
.SEAS 2.5 M OR LOWER OVER THE REMAINDER OF FORECAST AREA.
.MONSOON TROUGH 14N140W TO 05N150W TO 12N169W. SCATTERED MODERATE
TSTMS UP TO 250 NM ALONG EITHER SIDE OF MONSOON TROUGH W OF 155W.
SCATTERED MODERATE TO ISOLATED STRONG TSTMS ARE OCCURRING UP TO
400 NM S AND UP TO 150 NM N OF MONSOON TROUGH...E OF 155W.
.SCATTERED MODERATE TSTMS FROM 00N TO 03N BETWEEN 150W AND 160W.
$$
.FORECASTER CHAN. HONOLULU HI.=