HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2345 UTC FRI SEP 18 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 SEP 18.
24 HOUR FORECAST VALID 1800 UTC SEP 19.
48 HOUR FORECAST VALID 1800 UTC SEP 20.
.WARNINGS.
...STORM WARNING...
.COMPLEX LOW WITH MAIN CENTER NEAR 52N168W 1003 MB MOVING E 25
KT. WITHIN 600 NM S AND 660 NM W QUADRANTS...AND NW OF A LINE
FROM 55N173W TO 66N165W WINDS 20 TO 30 KT. SEAS TO 4 M...HIGHEST
SW OF CENTER.
.06 HOUR FORECAST LOW 51N162W 996 MB. WITHIN 360 NM SW OF A LINE
FROM 49N160W TO 52N168W WINDS 25 TO 40 KT. SEAS 3 TO 4.5 M.
.24 HOUR FORECAST LOW 53N152W 975 MB. WITHIN 180 NM SW SEMICIRCLE
WINDS 40 TO 50 KT. SEAS 4 TO 6 M. ELSEWHERE WITHIN 360 NM S AND
180 NM W QUADRANTS...AND WITHIN 90 NM NE OF A LINE FROM 51N145W
TO 55N150W WINDS 30 TO 40 KT. SEAS 2.5 TO 5 M. ELSEWHERE N OF 41N
BETWEEN 141W AND 161W WINDS 20 TO 30 KT. SEAS TO 4 M.
.48 HOUR FORECAST LOW 59N145W 977 MB. WITHIN 420 NM SE
SEMICIRCLE...AND WITHIN 300 NM SW OF A LINE FROM 56N149W TO
57N158W WINDS 25 TO 40 KT. SEAS 4 TO 7 M...HIGHEST SE OF CENTER.
ELSEWHERE WITHIN 600 NM NE AND SE... AND 900 NM W QUADRANTS WINDS
TO 25 KT. SEAS 2.5 TO 4.5 M.
...GALE WARNING...
.LOW 57N31W 998 MB MOVING N 15 KT. WITHIN 240 NM NE QUADRANT
WINDS 30 TO 40 KT. SEAS TO 3 M. ELSEWHERE N OF 54N BETWEEN 135W
AND 147W WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST LOW DISSIPATED INLAND AND CONDITIONS
DIMINISHED.
.SYNOPSIS AND FORECAST.
.LOW 50N144W 1010 MB MOVING NE 15 KT. WITHIN 240 NM E OF A LINE
FROM 54N143W TO 46N146W TO 41N150W WINDS 20 TO 30 KT. SEAS TO 2.5
M.
.24 HOUR FORECAST LOW 57N138W 1006 MB. FROM 52N TO 57N E OF 136W
WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST LOW MOVED INLAND AND CONDITIONS MERGED WITH LOW
59N145W DESCRIBED ABOVE.
.24 HOUR FORECAST WITHIN 180 NM OF THE CALIFORNIA COAST FROM 33N
TO 41N WINDS TO 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST FROM 35N TO 44N BETWEEN 122W AND 127W WINDS TO
25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST LOW 49N165W 1011 MB. FROM 43N TO 50N BETWEEN
162W AND 174W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 48N TO 50N
BETWEEN 162W AND 166W...AND WITHIN 90 NM NW OF A LINE FROM
65N165W TO 62N174W.
.24 HOUR FORECAST DENSE FOG FROM 49N TO 52N BETWEEN 137W AND
139W.
.48 HOUR FORECAST DENSE FOG FROM 57N TO 61N BETWEEN 160W AND
163W.
.FORECASTER POCHE. 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 1800 UTC FRI SEP 18.
24 HOUR FORECAST VALID 1800 UTC SAT SEP 19.
48 HOUR FORECAST VALID 1800 UTC SUN SEP 20.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.LOW PRES...INVEST EP98...NEAR 11N118W 1009 MB. WINDS 20 KT OR
LESS. SEAS LESS THAN 2.5 M. NUMEROUS MODERATE ISOLATED STRONG
FROM 08N TO 13N BETWEEN 117W AND 120W.
.24 HOUR FORECAST LOW PRES...INVEST EP98...POSSIBLE TROPICAL
CYCLONE...NEAR 11N122W 1008 MB. WITHIN 12N120W TO 15N121W TO
15N123W TO 13N124W TO 12N123W TO 12N120W WINDS 20 TO 25 KT.
SEAS 2.5 TO 3 M.
.48 HOUR FORECAST LOW PRES...INVEST EP98...POSSIBLE TROPICAL
CYCLONE...NEAR 11N126W 1007 MB. WITHIN 11N122W TO 13N123W TO
15N125W TO 11N126W TO 09N127W TO 09N123W TO 11N122W WINDS 20 TO
30 KT. SEAS 2.5 TO 3.5 M.
.TROPICAL WAVE FROM 16N105W TO 06N106W WITH LOW PRES...INVEST
EP99...NEAR 07N106W 1010 MB. WINDS 20 KT OR LESS. SEAS LESS THAN
2.5 M.
.24 HOUR FORECAST TROPICAL WAVE FROM 16N107W TO 06N110W WITH LOW
PRES...INVEST EP99...POSSIBLE TROPICAL CYCLONE...NEAR 11N107W
1008 MB. WITHIN 10N107W TO 11N108W TO 10N109W TO 08N109W TO
07N108W TO 08N106W TO 10N107W S TO SW WINDS 20 TO 25 KT. SEAS
2.5 TO 3 M.
.48 HOUR FORECAST LOW PRES...INVEST EP99...POSSIBLE TROPICAL
CYCLONE...NEAR 14N107W 1005 MB. WITHIN 11N106W TO 13N105W TO
15N105W TO 15N107W TO 13N106W TO 09N109W TO 10N105W TO 11N106W
WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.LOW PRES...FORMER TROPICAL DEPRESSION FIFTEEN...NEAR 17N137W
1008 MB. WITHIN 21N128W TO 22N140W TO 14N140W TO 16N131W TO
19N128W TO 21N128W NE TO E WINDS 20 TO 25 KT. SEAS 2.5 TO 3 M.
.24 HOUR FORECAST LOW PRES NEAR 15N140W 1008 MB. WITHIN 22N132W
TO 23N135W TO 22N140W TO 19N140W TO 18N134W TO 22N132W NE TO E
WINDS 20 TO 25 KT. SEAS 2.5 TO 3 M.
.48 HOUR FORECAST LOW PRES WELL W OF AREA. WITHIN 16N130W TO
21N132W TO 24N135W TO 26N140W TO 19N140W TO 16N130W NE TO E WINDS
20 TO 25 KT. SEAS 2.5 TO 3 M.
.WITHIN 16N94W TO 16N95W TO 15N97W TO 13N97W TO 14N95W TO 15N94W
TO 16N94W...INCLUDING THE GULF OF TEHUANTEPEC...N TO NE WINDS 20
TO 30 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
.WITHIN 12N86W TO 12N88W TO 11N89W TO 10N89W TO 09N87W TO 10N86W
TO 12N86W...INCLUDING THE GULF OF PAPAGAYO...NE TO E WINDS 20 TO
25 KT. SEAS LESS THAN 2.5 M.
.18 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
.WITHIN 28N115W TO 29N114W TO 29N116W TO 28N116W TO 26N114W TO
27N114W TO 28N115W...INCLUDING SEBASTIAN VIZCAINO BAY AND WITHIN
60 NM OF SHORE...NW WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
CONVECTION VALID AT 2115 UTC FRI SEP 18...
.LOW PRES NEAR 17N137W...NUMEROUS MODERATE WITHIN 180 NM NE
QUADRANT AND 90 NM SE QUADRANT.
.LOW PRES...INVEST EP98...NEAR 11N118W...NUMEROUS MODERATE
ISOLATED STRONG FROM 08N TO 13N BETWEEN 117W AND 120W.
.LOW PRES...INVEST EP99...NEAR 07N106W...SCATTERED MODERATE
ISOLATED STRONG FROM 07N TO 12N BETWEEN 103W AND 108W.
.NUMEROUS MODERATE TO STRONG FROM 04N TO 09N BETWEEN 78W AND 82W
AND FROM 12N TO 18N BETWEEN 126W AND 133W.
.SCATTERED MODERATE ISOLATED STRONG FROM 17N TO 23N BETWEEN
105.5W AND 111W.
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS EXTENDS FROM 10N85W TO 09N90W TO 09N100W TO
06N101W TO 06N111W TO 10N114W TO LOW PRES...INVEST EP98...NEAR
11N118W TO 12N126W. IT RESUMES AT 13N138W TO BEYOND 12N140W.
SCATTERED MODERATE ISOLATED STRONG WITHIN 300 N OF THE TROUGH
BETWEEN 93W AND 103W...WITHIN 300 NM S OF THE TROUGH BETWEEN 90W
AND 102W AND WITHIN 120 NM S OF THE TROUGH BETWEEN 120W AND 126W.
.FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W
SYNOPSIS VALID 1800 UTC SEP 18 2026.
24 HOUR FORECAST VALID 1800 UTC SEP 19 2026.
48 HOUR FORECAST VALID 1800 UTC SEP 20 2026.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.TROUGH 23N160W 18N163W MOVING W 10 KT.
.24 HOUR FORECAST TROUGH DISSIPATED.
.LOW 12N158W 1008 MB MOVING W 5 KT.
.24 HOUR FORECAST LOW 12N161W 1008 MB.
.48 HOUR FORECAST LOW 12N163W 1012 MB.
.24 HOUR FORECAST NEW LOW 16N140W 1011 MB.
.48 HOUR FORECAST LOW 15N145W 1011 MB.
.NE WINDS 20 TO 25 KT FROM 15N TO 20N BETWEEN 143W AND 140W.
.24 HOUR FORECAST WINDS DIMINISHING TO 20 KT OR LESS.
.SEAS 2.5 TO 3 M FROM 15N TO 20N E OF 146W.
.24 HOUR FORECAST SEAS 2.5 TO 3 M FROM 15N TO 22N BETWEEN 150W
AND 143W.
.48 HOUR FORECAST SEAS 2.5 TO 3 M FROM 17N TO 20N BETWEEN 151W
AND 147W.
.OTHERWISE...WINDS 20 KT OR LESS AND SEAS 2.5 M OR LESS OVER THE
REMAINDER OF FORECAST AREA.
.MONSOON TROUGH 05N180W 07N170W 12N158W 09N145W 12N140W. SCATTERED
MODERATE TSTMS FROM 07N TO 10N BETWEEN 173W AND 165W...AND FROM
10N TO 15N BETWEEN 165W AND 145W.
.ISOLATED MODERATE TSTMS WITHIN 90 NM OF POINT 20N161W...AND FROM
EQUATOR TO 05N BETWEEN 155W AND 145W.
$$
.FORECASTER PECHACEK. HONOLULU HI.=