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Post-Tropical Cyclone Jimena Forecast Discussion

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WTPA42 PHFO 070235

Post-Tropical Cyclone Jimena Discussion Number  17
NWS Central Pacific Hurricane Center Honolulu HI   EP092021
500 PM HST Fri Aug 06 2021

Deep convection near center of Jimena collapsed overnight, and 
Jimena consists of a low cloud swirl with shallow convection 
flaring along its northern and eastern flanks. Dvorak current 
intensity estimates varied from 1.5 at HFO to unclassifiable at SAB, 
while CIMSS ADT held onto a 2.0/30 kt. Jimena is moving over sub 24C 
sea surface temperatures as it draws in dry air from the north, and 
westerly vertical wind shear of more than 15 kt is increasing. 
Given its current structure and the hostile environment ahead, 
Jimena has been downgraded to a post-tropical remnant low with an 
initial intensity of 30 kt.

Post-Tropical Cyclone Jimena will continue to be steered toward the 
west-northwest (295 degrees) around 7 kt tonight by a deep 
subtropical ridge to the north. Under an environment of cool sea 
surface temperatures and continued westerly vertical wind shear, 
the increasingly shallow system will move toward the west this 
weekend until dissipation.

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


INIT  07/0300Z 17.9N 140.8W   30 KT  35 MPH...POST-TROPICAL
 12H  07/1200Z 18.5N 142.0W   25 KT  30 MPH...POST-TROP/REMNT LOW
 24H  08/0000Z 18.9N 143.3W   25 KT  30 MPH...POST-TROP/REMNT LOW
 36H  08/1200Z 19.2N 144.8W   20 KT  25 MPH...POST-TROP/REMNT LOW
 48H  09/0000Z...DISSIPATED

Forecaster Wroe