HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
0545 UTC SUN AUG 31 2025
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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 N OF 30N AND S OF 67N E OF A LINE FROM BERING STRAIT
TO 50N 160E
ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS
SYNOPSIS VALID 0000 UTC AUG 31.
24 HOUR FORECAST VALID 0000 UTC SEP 01.
48 HOUR FORECAST VALID 0000 UTC SEP 02.
.WARNINGS.
...GALE WARNING...
.LOW 55N179E 983 MB MOVING N 05 KT. WITHIN 360 NM W
QUADRANT...AND WITHIN 240 NM NE AND E OF A FRONT EXTENDING FROM
63N173W TO 58N168W TO 50N168W TO 45N170W WINDS 30 TO 40 KT. SEAS
3 TO 5.5 M. ELSEWHERE FROM 44N TO 66N BETWEEN 160W AND 168E...AND
WITHIN 180 NM E AND SE OF A FRONT EXTENDING FROM 44N171W TO
38N178W WINDS 20 TO 30 KT. SEAS 2.5 TO 5 M.
.24 HOUR FORECAST LOW 58N179E 988 MB. N OF 52N BETWEEN 160W AND
172E WINDS 25 TO 35 KT. SEAS TO 4 M.
.48 HOUR FORECAST LOW 58N177W 994 MB. FROM 53N TO 60N BETWEEN
167W AND 177E WINDS 25 TO 35 KT. SEAS 2.5 TO 4.5 M.
...GALE WARNING...
.LOW 39N155W 1002 MB MOVING SE 10 KT. FROM 34N TO 44N BETWEEN
151W AND 162W WINDS 25 TO 35 KT. SEAS 2.5 TO 5.5 M.
.24 HOUR FORECAST LOW 38N151W 1005 MB. FROM 32N TO 44N BETWEEN
142W AND 157W WINDS 20 TO 30 KT. SEAS TO 3.5 M.
.48 HOUR FORECAST LOW 38N150W 1009 MB. FROM 31N TO 46N BETWEEN
141W AND 150W WINDS 20 TO 30 KT. SEAS TO 3 M.
...GALE WARNING...
.LOW W OF AREA 39N157E 1007 MB MOVING SE 25 KT. FROM 37N TO 40N
BETWEEN 160E AND 162E WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST LOW 36N167E 1007 MB. FROM 32N TO 39N BETWEEN
176W AND 160E WINDS 20 TO 30 KT. SEAS TO 3 M.
.42 HOUR FORECAST LOW 35N176E 1004 MB. FROM 32N TO 39N BETWEEN
179W AND 170E WINDS 25 TO 35 KT. SEAS TO 3.5 M.
.48 HOUR FORECAST LOW 38N177W 1007 MB. FROM 32N TO 40N BETWEEN
173W AND 172E WINDS 25 TO 35 KT. SEAS TO 4 M.
.SYNOPSIS AND FORECAST.
.24 HOUR FORECAST NEW LOW 44N168W 1010 MB. WITHIN 180 NM E AND SE
OF A FRONT TO EXTEND FROM 50N166W TO THE LOW TO 40N170W TO
38N175W WINDS 20 TO 30 KT. SEAS TO 3.5 M.
.48 HOUR FORECAST LOW DISSIPATED. N OF 54N BETWEEN 151W AND 159W
AREA OF SE TO S WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST FROM 51N TO 57N BETWEEN 132W AND 136W AREA OF
NW TO N WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST FROM 49N TO 58N BETWEEN 132W AND 139W AREA OF
NW TO N WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST FROM 35N TO 41N BETWEEN 122W AND 125W AREA OF
NW TO N WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST FROM 36N TO 43N BETWEEN 122W AND 126W AREA OF
NW TO N WINDS 20 TO 30 KT. SEAS TO 3 M.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 46N TO 62N
BETWEEN 167W AND 179E.
.24 HOUR FORECAST DENSE FOG FROM 47N TO 58N BETWEEN 159W AND
167W...AND N OF 55N W OF 179E.
.48 HOUR FORECAST DENSE FOG FROM 40N TO 45N BETWEEN 169W AND
177W.
.FORECASTER HUFFMAN. 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 0000 UTC SUN AUG 31.
24 HOUR FORECAST VALID 0000 UTC MON SEP 1.
48 HOUR FORECAST VALID 0000 UTC TUE SEP 2.
.WARNINGS.
...GALE WARNING...
.LOW PRES NEAR 14.5N121W 1009 MB. WITHIN 15.5N120W TO 16N120.5W
TO 16N121.5W TO 15N122W TO 15.5N121W TO 15N120.5W TO 15.5N120W NE
TO E WINDS 20 TO 25 KT. SEAS TO 2.5 M IN S TO SW SWELL.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
14.5N124.5W 1006 MB. WITHIN 30 NM N SEMICIRCLE WINDS 30 TO 35
KT. SEAS 3.0 M. ELSEWHERE WITHIN 16N124W TO 16N125W TO 15N125W TO
14N125W TO 14N124W TO 16N124W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0
M IN MERGING NE AND S SWELL.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
14.5N128W 1003 MB. WITHIN 45 NM OF CENTER WINDS 30 TO 40 KT. SEAS
3.0 TO 3.5 M. ELSEWHERE WITHIN 15N128W TO 15.5N128.5W TO
15N128.5W
TO 15N129W TO 14.5N129W TO 14.5N128W TO 15N128W WINDS 20 TO 30
KT. SEAS 2.5 TO 3.0 M. REMAINDER OF AREA WITHIN 15N126W TO
16N129W TO 14N129W TO 13N128W TO 13N127W TO 14N127W TO 15N126W
WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN MERGING NE AND S SWELL.
.SYNOPSIS AND FORECAST.
.WITHIN 06N91W TO 08N96W TO 07N108W TO 04N110W TO 03N106W TO
04N94W TO 06N91W WINDS 20 KT OR LESS. SEAS 2.5 M IN S TO SW
SWELL. WITHIN 02S82W TO 03S91W TO 03.4S96W TO 03S89W TO 03S87W TO
03S82W TO 02S82W WINDS 20 KT OR LESS. SEAS 2.5 M IN MIXED SE AND
SW SWELL.
.24 HOUR FORECAST WITHIN 06N104W TO 06N106W TO 06N106W TO
05N106W TO 05N104W TO 06N103W TO 06N104W WINDS 20 KT OR LESS.
SEAS 2.5 M IN S TO SW SWELL. WITHIN 03S115W TO 01S120W TO
03.4S120W TO 03.4S92W TO 03S115W WINDS 20 KT OR LESS. SEAS 2.5 TO
3.0 M IN S TO SW SWELL.
.48 HOUR FORECAST WITHIN 09N106W TO 07N115W TO 04N117W TO
05N106W TO 02N98W TO 04N96W TO 09N106W WINDS 20 KT OR LESS. SEAS
2.5 M IN S TO SW SWELL. WITHIN 00N105W TO 00N114W TO 03.4S120W TO
03.4S99W TO 00N105W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S
TO SW SWELL.
.18 HOUR FORECAST WITHIN 15.5N96.5W TO 15.5N98W TO 15N98W TO
14.5N97.5W TO 15N97W TO 15.5N96.5W E TO SE WINDS 20 TO 25 KT.
SEAS 2.5 M IN S TO SW SWELL. ELSEWHERE WITHIN 15N96W TO 16N98W
TO 16N99W TO 15N99W TO 14N97W TO 14N96W TO 15N96W WINDS 20 KT OR
LESS. SEAS 2.5 M IN S TO SW SWELL.
.24 HOUR FORECAST WITHIN 16N97W TO 16N99W TO 16N100W TO 15N100W
TO 14N98W TO 15N97W TO 16N97W E TO SE WINDS 20 TO 25 KT. SEAS 2.5
M IN S TO SW SWELL.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR
16N106W 1008 MB. WITHIN 18N104W TO 19N104W TO 18N105W TO 17N106W
TO 16N104W TO 17N104W TO 18N104W SE WINDS 20 TO 30 KT. SEAS 2.5
TO 3.0 M. ELSEWHERE WITHIN 17N102W TO 19N105W TO 18N106W TO
16N106W TO 16N104W TO 16N103W TO 17N102W WINDS 20 KT OR LESS.
SEAS 2.5 M IN S TO SW SWELL.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
CONVECTION VALID AT 0300 UTC SUN AUG 31...
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 10N73W TO 08N79W TO 11.5N102W TO LOW
PRES NEAR 14.5N121W TO 11.5N125W TO 11N131W. ITCZ FROM 11N131W
TO BEYOND 09N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION
FROM 05N TO 11N E OF 89W...FROM 07N TO 16.5N BETWEEN 91W AND
109W...FROM 11N TO 17N BETWEEN 111W AND 123W...AND FROM 07N TO
12N BETWEEN 121W AND 140W.
.FORECASTER STRIPLING. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E
SYNOPSIS VALID 0000 UTC AUG 31 2025.
24 HOUR FORECAST VALID 0000 UTC SEP 01 2025.
48 HOUR FORECAST VALID 0000 UTC SEP 02 2025.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.FRONT 30N155W 29N162W 30N170W NEARLY STATIONARY.
.24 HOUR FORECAST FRONT 30N150W 28N153W THENCE TROUGH
25N155W.
.48 HOUR FORECAST FRONT WEAKENS TO TROUGH 30N148W 27N156W.
.TROUGH 30N152W 28N157W MOVING E 10 KT.
.24 HOUR FORECAST TROUGH MERGES WITH FRONT DESCRIBED ABOVE.
.LOW NEAR 14N154W 1010 MB. TROUGH FROM LOW TO 16N152W AND FROM
LOW TO 13N156W MOVING W 10 KT. ISOLATED TSTMS WITHIN 120 NM OF
LOW.
.24 HOUR FORECAST LOW WEAKENS TO TROUGH 15N155W 13N158W.
.48 HOUR FORECAST TROUGH 17N162W 13N158W 10N155W.
.TROUGH 15N170W 12N171W 10N173W MOVING W 10 KT.
.24 HOUR FORECAST TROUGH DISSIPATED.
.WINDS 20 KT OR LESS AND SEAS 2.5 M OR LOWER OVER ENTIRE FORECAST
AREA.
.ITCZ 09N140W 10N145W 13N149W...AND 11N157W 09N169W...AND 13N174W
12N180W 12N165E. ISOLATED TSTMS WITHIN 120 NM OF ITCZ.
$$
.FORECASTER PECHACEK. HONOLULU HI.=