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Post-Tropical Cyclone Calvin Forecast Discussion

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WTPA41 PHFO 192044

Post-Tropical Cyclone Calvin Discussion Number  33
NWS Central Pacific Hurricane Center Honolulu HI   EP032023
1100 AM HST Wed Jul 19 2023

Visible satellite imagery shows that Calvin's fully exposed low-
level center is becoming increasingly broad and ill-defined. 
Subjective Dvorak fixes indicate that Calvin is too weak to 
classify, and central convection has been absent for sufficiently 
long that Calvin can safely be deemed post-tropical. Gale force 
winds continue in the northern semicircle for now, but increased 
vertical wind shear along the forecast track will prevent Calvin 
from redeveloping. The updated forecast track lies close to the 
well-performing HCCA and ECMWF guidance, with dissipation expected 
in about 36 hours as the environment becomes increasingly hostile.

This is the last advisory issued by the Central Pacific Hurricane 
Center on this system. Additional information on this system can be 
found in High Seas Forecasts issued by the National Weather Service 
in Honolulu, under AWIPS header HFOHSFNP, WMO header FZPN40 PHFO, 
and online at 


INIT  19/2100Z 17.9N 158.5W   35 KT  40 MPH...POST-TROPICAL
 12H  20/0600Z 18.2N 161.3W   30 KT  35 MPH...POST-TROP/REMNT LOW
 24H  20/1800Z 18.5N 165.0W   30 KT  35 MPH...POST-TROP/REMNT LOW
 36H  21/0600Z...DISSIPATED

Forecaster Birchard