FORECASTER HAGEN
// END PART 02/02 //
TCMEP4
POST-TROPICAL CYCLONE ISELLE FORECAST/ADVISORY NUMBER 15
NWS NATIONAL HURRICANE CENTER MIAMI FL EP092026
0300 UTC THU AUG 27 2026
POST-TROPICAL CYCLONE CENTER LOCATED NEAR 23.0N 125.9W AT 27/0300Z
POSITION ACCURATE WITHIN 30 NM
PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 300 DEGREES AT 8 KT
ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB
MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT.
4 M SEAS....180NE 90SE 90SW 150NW.
WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL
MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.
REPEAT...CENTER LOCATED NEAR 23.0N 125.9W AT 27/0300Z
AT 27/0000Z CENTER WAS LOCATED NEAR 22.8N 125.5W
FORECAST VALID 27/1200Z 23.6N 127.2W...POST-TROP/REMNT LOW
MAX WIND 25 KT...GUSTS 35 KT.
FORECAST VALID 28/0000Z 24.3N 128.8W...POST-TROP/REMNT LOW
MAX WIND 20 KT...GUSTS 30 KT.
FORECAST VALID 28/1200Z 24.8N 130.2W...POST-TROP/REMNT LOW
MAX WIND 20 KT...GUSTS 30 KT.
FORECAST VALID 29/0000Z 25.3N 131.6W...POST-TROP/REMNT LOW
MAX WIND 20 KT...GUSTS 30 KT.
FORECAST VALID 29/1200Z...DISSIPATED
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 23.0N 125.9W
THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
CENTER ON THIS SYSTEM. FOR ADDITIONAL INFORMATION ON THE REMNANT LOW
PLEASE SEE HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
SERVICE...UNDER AWIPS HEADER NFDHSFEPI AND WMO HEADER FZPN01 KWBC.
$$
FORECASTER KATZ/HAGEN/PAPIN
HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2345 UTC WED AUG 26 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 26.
24 HOUR FORECAST VALID 1800 UTC AUG 27.
48 HOUR FORECAST VALID 1800 UTC AUG 28.
.WARNINGS.
...TROPICAL STORM WARNING...
.TROPICAL STORM LALA NEAR 36.1N 178.3W 999 MB AT 2100 UTC AUG 26
MOVING NW OR 320 DEG AT 4 KT.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE
WINDS WITHIN 100 NM NE QUADRANT...90 NM SE QUADRANT...
0 NM SW QUADRANT ...AND 70 NM NW QUADRANT. SEAS 4 M OR GREATER
WITHIN 160 NM NE QUADRANT...80 NM SE QUADRANT...70 NM SW
QUADRANT...AND 170 NM NW QUADRANT WITH SEAS TO 5.5 M. ELSEWHERE
FROM 32N TO 40N W OF 170W WINDS 20 TO 33 KT. SEAS 2.5 TO 4.5 M.
.24 HOUR FORECAST TROPICAL STORM LALA NEAR 37.4N 179.0W. MAXIMUM
SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE WINDS
WITHIN 90 NM NE QUADRANT ...60 NM SE QUADRANT...0 NM SW
QUADRANT...AND 70 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 180
NM N SEMICIRCLE
...AND 90 NM SW AND 180 NM SE QUADRANTS WITH SEAS TO 5.5 M.
ELSEWHERE FROM 34N TO 42N W OF 172W WINDS 20 TO 33 KT. SEAS TO
3.5 M.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW LALA NEAR 38.5N
179.2E. WITHIN 180 NM E AND NE QUADRANTS WINDS 25 TO 35 KT. SEAS
TO 3.5 M.
...GALE WARNING...
.LOW W OF AREA 55N166E 993 MB MOVING NE 15 KT. WITHIN 600 NM E
QUADRANT WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST COMPLEX LOW WITH FIRST LOW 57N174E 992 MB AND
SECOND LOW 60N179W 993 MB. WITHIN 360 NM S QUADRANT OF FIRST LOW
AND 420 NM S AND SE
QUADRANTS OF SECOND LOW WINDS 25 TO 40 KT. SEAS 3 TO 6
M...HIGHEST S QUADRANT OF FIRST LOW. ELSEWHERE W AND NW OF A
LINE FROM 48N170W TO 59N160W W WINDS
20 TO 30 KT. SEAS TO 3.5 M.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN LOW 64N163W 990 MB.
WITHIN 720 NM S AND 180 NM W AND SW QUADRANTS WINDS 20 TO 30 KT.
SEAS TO 3.5 M.
.SYNOPSIS AND FORECAST.
.LOW 48N130W 1009 MB DRIFTING NE. WITHIN 480 NM W QUADRANT WINDS
TO 25 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW 50N129W 1014 MB. ASSOCIATED CONDITONS
DIMINISHED.
.48 HOUR FORECAST LOW MOVED INLAND. ASSOCIATED CONDITIONS
DIMINISHED.
.LOW 59N144W 1012 MB DRIFTING E. WITHIN 420 NM SW QUADRANT WINDS
TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST LOW 56N138W 1014 MB. ASSOCIATED CONDITIONS
DIMINISHED.
.48 HOUR FORECAST LOW MOVED INLAND. ASSOCIATED CONDITIONS
DIMINISHED.
.FROM 33N TO 38N BETWEEN 120W AND 125W AREA OF NW TO N WINDS TO
25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST FROM 32N TO 39N BETWEEN 120W AND 126W AREA OF
NW TO N WINDS TO 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST FROM 34N TO 40N BETWEEN 120W AND 126W AREA OF
NW TO N WINDS TO 25 KT. SEAS TO 2.5 M.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 43N TO 57N W
OF 170W.
.24 HOUR FORECAST DENSE FOG W OF A LINE FROM 44N180W TO 61N158W.
.48 HOUR FORECAST DENSE FOG WITHIN 180 NM N AND NW OF A LINE
FROM 45N180W TO 53N160W TO 58N143W.
.FORECASTER ROWLAND. 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 WED AUG 26.
24 HOUR FORECAST VALID 1800 UTC THU AUG 27.
48 HOUR FORECAST VALID 1800 UTC FRI AUG 28.
.WARNINGS.
...TROPICAL STORM WARNING...
.TROPICAL STORM ISELLE NEAR 22.7N 124.9W 1003 MB AT 2100 UTC AUG
26 MOVING WNW OR 295 DEG AT 9 KT. MAXIMUM SUSTAINED WINDS 35 KT
GUSTS 45 KT. TROPICAL STORM FORCE WINDS WITHIN 0 NM S SEMICIRCLE
...140 NM NE QUADRANT AND 90 NM NW QUADRANT. SEAS 4 M OR GREATER
WITHIN 90 NM S SEMICIRCLE...180 NM NE QUADRANT AND 150 NM NW
QUADRANT WITH SEAS TO 5.5 M. ELSEWHERE WITHIN 24N121W TO 26N123W
TO 25N128W TO 20N126W TO 20N124W TO 21N121W TO 24N121W WINDS 20
TO 33 KT. SEAS 2.5 TO 4.0 M. REMAINDER OF AREA WITHIN 30N121W TO
26N126W TO 30N128W TO 21N131W TO 18N127W TO 20N119W TO 30N121W
WINDS 20 KT OR LESS. SEAS 2.5 TO 3.5 M IN MIXED SWELL.
.12 HOUR FORECAST POST-TROPICAL ISELLE NEAR 23.2N 126.2W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT.
.24 HOUR FORECAST POST-TROPICAL REMNANT LOW ISELLE NEAR 23.9N
127.9W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. SEAS 4 M OR
GREATER WITHIN 75 NM N SEMICIRCLE...AND 0 NM S SEMICIRCLE WITH
SEAS TO 4.0 M. ELSEWHERE WITHIN 25N126W TO 26N129W TO 26N131W TO
24N131W TO 22N128W TO 23N126W TO 25N126W WINDS 20 TO 30 KT. SEAS
2.5 TO 4.0 M. REMAINDER OF AREA WITHIN 29N128W TO 27N132W TO
23N134W TO 21N133W TO 21N129W TO 24N125W TO 29N128W WINDS 20 KT
OR LESS. SEAS 2.5 TO 3.0 M IN MIXED SWELL.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW ISELLE NEAR 25.3N
131.1W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. WITHIN 26N130W
TO 27N131W TO 26N132W TO 25N132W TO 24N132W TO 25N130W TO
26N130W WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0 M. ELSEWHERE WITHIN
28N129W TO 29N133W TO 28N135W TO 25N136W TO 24N134W TO 26N130W TO
28N129W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN MIXED SWELL.
FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE
USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE
AND INTENSITY.
.SYNOPSIS AND FORECAST.
.LOW PRES...INVEST EP93...NEAR 09N107W 1007 MB. WITHIN 12N105W
TO 14N108W TO 10N109W TO 08N112W TO 06N110W TO 09N105W TO 12N105W
WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0 M.
.24 HOUR FORECAST LOW PRES...INVEST EP93...POSSIBLE TROPICAL
CYCLONE...NEAR 11.5N111W 1003 MB. WITHIN 15N107W TO 16N111W TO
14N114W TO 07N117W TO 04N111W TO 07N106W TO 15N107W WINDS 20 TO
30 KT. SEAS 3.0 TO 4.5 M. ELSEWHERE WITHIN 08N105W TO 16N107W TO
15N115W TO 04N117W TO 00N116W TO 04N108W TO 08N105W WINDS 20 KT
OR LESS. SEAS 2.5 TO 3.5 M IN MIXED SWELL.
.48 HOUR FORECAST LOW PRES...INVEST EP93...POSSIBLE TROPICAL
CYCLONE...NEAR 13.5N115.5W 999 MB. WITHIN 19N109W TO 19N118W TO
07N118W TO 08N111W TO 13N108W TO 19N109W WINDS 20 TO 30 KT. SEAS
4.0 TO 5.5 M. ELSEWHERE WITHIN 18N107W TO 21N109W TO 19N119W TO
06N119W TO 03N114W TO 08N106W TO 18N107W WINDS 20 KT OR LESS.
SEAS 2.5 TO 3.5 M IN MIXED SWELL.
.WITHIN 15N94W TO 16N94W TO 16N95W TO 15N96W TO 13N97W TO 13N96W
TO 15N94W...INCLUDING THE GULF OF TEHUANTEPEC...N TO NE WINDS 20
TO 30 KT. SEAS BUILDING TO 2.5 M OVERNIGHT.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.
.WITHIN 11N86W TO 12N87W TO 11N88W TO 10N88W TO 10N86W TO 11N86W
...INCLUDING THE GULF OF PAPAGAYO...NE TO E WINDS 20 TO 25 KT.
SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.
.WITHIN 02N109W TO 00N117W TO 02N130W TO 00N135W TO 01S117W TO
03S111W TO 02N109W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S
TO SW SWELL.
.24 HOUR FORECAST WITHIN 05N106W TO 01N115W TO 00N131W TO
02S120W TO 03.4S120W TO 03.4S105W TO 05N106W WINDS 20 KT OR LESS.
SEAS 2.5 TO 3.0 M IN S TO SW SWELL.
.48 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS
LESS THAN 2.5 M.
.18 HOUR FORECAST LOW PRES...INVEST EP94...NEAR 12N132.5W 1007
MB. WITHIN 12N131W TO 12N133W TO 10N136W TO 09N135W TO 08N133W
TO 09N130W TO 12N131W SW TO W WINDS 20 TO 25 KT. SEAS BUILDING
TO
2.5 TO 3.0 M .
.24 HOUR FORECAST LOW PRES...INVEST EP94...NEAR 12N.5N131.5W 1006
MB. WITHIN 10N130W TO 12N133W TO 08N138W TO 07N138W TO 07N135W
TO 09N131W TO 10N130W SW TO W WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0
M.
.48 HOUR FORECAST LOW PRES...INVEST EP94...POSSIBLE TROPICAL
CYCLONE...NEARLY STATIONARY NEAR 12.5N131.5W 1004 MB. WITHIN
12N129W TO 13N131W TO 12N135W TO 06N135W TO 06N134W TO 09N129W TO
12N129W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
CONVECTION VALID AT 2100 UTC WED AUG 26...
.TROPICAL STORM ISELLE...SCATTERED MODERATE ISOLATED STRONG
BETWEEN 75 NM AND 210 NM NE QUADRANT.
.LOW PRES...INVEST EP93...SCATTERED TO NUMEROUS MODERATE TO
STRONG FROM 02N TO 15N BETWEEN 77W AND 117W.
.LOW PRES...INVEST EP94...WIDELY SCATTERED MODERATE ISOLATED
STRONG
WITHIN 600 NM SE SEMICIRCLE...AND 150 NM NW SEMICIRCLE.
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM LOW PRES NEAR 10N74.5W TO 08N88W TO 10N100W
TO LOW PRES...INVEST EP93...NEAR 09N107W TO 14N118W THEN RESUMES
SE OF TROPICAL STORM ISELLE AT 16N119W TO LOW PRES...INVEST
EP94...NEAR 10.5N135W TO BEYOND 11N140W. ISOLATED TO WIDELY
SCATTERED MODERATE TO STRONG WITHIN 300 NM S OF MONSOON TROUGH
BETWEEN 119W AND 128W.
$$
.FORECASTER LEWITSKY. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W
SYNOPSIS VALID 1800 UTC AUG 26 2026.
24 HOUR FORECAST VALID 1800 UTC AUG 27 2026.
48 HOUR FORECAST VALID 1800 UTC AUG 28 2026.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST
.LOW 10N145W 1010 MB NEARLY STATIONARY. SCATTERED MODERATE TSTMS
WITHIN 300 NM N SEMICIRCLE OF LOW CENTER.
.24 HOUR FORECAST LOW 10N147W 1010 MB.
.48 HOUR FORECAST LOW 11N146W 1010 MB.
.LOW 17N172W 1010 MB MOVING W 10 KT. TROUGH FROM 20N171W TO LOW TO
13N171W MOVING W 10 KT. SEAS 2.5 TO 3 M WITHIN 120 N SEMICIRCLE
FROM
LOW CENTER. SCATTERED MODERATE TSTMS WITHIN 160 NM N SEMICIRCLE OF
LOW CENTER.
.24 HOUR FORECAST LOW WEAKENING INTO TROUGH FROM 18N175W TO
11N180W. SEAS 2.5 M OR LOWER.
.48 HOUR FORECAST TROUGH MOVED W OF AREA.
.LOW 06N176W 1011 MB MOVING W SLOWLY.
.24 HOUR FORECAST LOW 06N179W 1011 MB.
.48 HOUR FORECAST LOW MOVED W OF AREA.
.TROUGH 08N170W TO LOW DESCRIBED IMMEDIATELY ABOVE TO 05N180W
NEARLY STATIONARY.
.24 HOUR FORECAST TROUGH 08N170W TO LOW TO 05N180W.
.48 HOUR FORECAST TROUGH 14N170W 10N177W 08N180W.
.STATIONARY FRONT 30N150W 29N154W 29N156W.
.24 HOUR FORECAST FRONT WEAKENED TO TROUGH 30N160W 25N160W.
.48 HOUR FORECAST TROUGH 30N161W 24N164W.
.WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.
.48 HOUR FORECAST WINDS 20 TO 30 KT WITHIN 100 NM OF
A LINE 08N140W 07N147W 05N154W.
.SEAS 2.5 M OR LESS OVER THE REMAINDER OF FORECAST AREA.
.MONSOON TROUGH FROM 11N140W TO FIRST LOW ABOVE TO 09N158W TO
14N165W.
.SCATTERED MODERATE TSTMS E OF 165W S OF 10N.
$$
.FORECASTER VAUGHAN. HONOLULU HI.=