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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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