mber 37
9545Central North Pacific Post-Tropical Cyclone Henriette Discussion Number 37
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
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