279
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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