454
WTPA43 PHFO 130847
TCDCP3
POST-TROPICAL CYCLONE HENRIETTE DISCUSSION NUMBER 37
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI EP082025
ISSUED BY NWS NATIONAL HURRICANE CENTER MIAMI FL
1100 PM HST TUE AUG 12 2025
HENRIETTE HAS FAILED TO PRODUCE ANY DEEP CONVECTION NEAR THE
LOW-LEVEL CENTER FOR ABOUT 12 HOURS. GLOBAL MODELS SHOW THAT
CONVECTION IS NOT EXPECTED TO RETURN OVER THE LOW-LEVEL CENTER IN AN
ENVIRONMENT OF STRONG VERTICAL WIND SHEAR, DRY MID-LEVEL AIR, AND
COOLING SSTS ALONG THE FORECAST TRACK. WITH CONVECTION NOT
ANTICIPATED TO RETURN, HENRIETTE IS NOW DESIGNATED AS A
POST-TROPICAL CYCLONE. A RECENT SCATTEROMETER METOP-B PASS AT 0717
UTC SHOWED WINDS AROUND 35-39 KT, MAINLY IN THE EASTERN SEMI-CIRCLE.
USING THIS DATA, AND AN ASSUMED WEAKENING TREND FROM THE PREVIOUS
ADVISORY THE INTENSITY IS SET TO 40 KT.
THE CYCLONE IS MOVING TOWARDS THE NORTHWEST AT 325/17 KT. THIS
GENERAL MOTION SHOULD CONTINUE THROUGH WEDNESDAY, WITH A TURN TO THE
NORTH, THEN NORTHEAST AROUND A LARGE SUBTROPICAL RIDGE AS THE SYSTEM
CONTINUES TO WEAKEN. THE CYCLONE IS FORECAST TO OPEN INTO A TROUGH
AND DISSIPATE BY THE END OF THE WEEK.
THIS IS THE LAST ADVISORY FOR THIS SYSTEM. FOR ADDITIONAL
INFORMATION ON THE POST-TROPICAL CYCLONE PLEASE SEE HIGH SEAS
FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE, UNDER AWIPS HEADER
NFDHSFEPI, WMO HEADER FZPN02 KWBC, AND ON THE WEB AT
OCEAN.WEATHER.GOV/SHTML/NFDHSFEPI.PHP
FORECAST POSITIONS AND MAX WINDS
INIT 13/0900Z 36.7N 165.6W 40 KT 45 MPH...POST-TROPICAL
12H 13/1800Z 38.6N 167.4W 30 KT 35 MPH...POST-TROP/REMNT LOW
24H 14/0600Z 41.0N 168.5W 25 KT 30 MPH...POST-TROP/REMNT LOW
36H 14/1800Z 43.2N 168.1W 20 KT 25 MPH...POST-TROP/REMNT LOW
48H 15/0600Z 43.8N 166.8W 15 KT 15 MPH...POST-TROP/REMNT LOW
60H 15/1800Z...DISSIPATED
FORECASTER KELLY
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