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000 WTPA41 PHFO 192044 TCDCP1 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 weather.gov/hfo/HSFNP. FORECAST POSITIONS AND MAX WINDS 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
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Page last modified: Wednesday, 19-Jul-2023 20:44:57 UTC