000
WTPA42 PHFO 070235
TCDCP2
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
FZPN40 PHFO.
FORECAST POSITIONS AND MAX WINDS
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