ZCZC HFOTCDCP1 ALL
TTAA00 PHFO DDHHMM
Tropical Storm Darby Discussion Number 29
NWS Central Pacific Hurricane Center Honolulu HI EP052022
500 AM HST Sat Jul 16 2022
Deep convection associated with Darby remains limited, with only
a recent burst of convection north of the low-level circulation
center over the past few hours. CIMSS SATCON intensity estimates
remain around 40 kt. The current satellite intensity estimate
from PHFO is 35 kt. Based on these data, and convective trends, the
initial intensity remains at 40 kt.
The initial motion is now 270/19 kt. Low- to mid-level easterly
flow associated with high pressure to the north supports the
westerly track persisting until the system dissipates. The new
forecast track is in the center of the tightly-clustered track
guidance, with only a slight increase in forward speed compared to
the previous forecast.
Darby will continue to weaken as it moves over 25-26C sea surface
temperatures and ingests drier air. This combined with moderate
shear will translate to the system becoming a post-tropical cyclone
by 24 hours, and the global models are in good agreement that the
system will dissipate to a surface trough by 36 hours. The new
intensity forecast is very similar to the previous forecast.
FORECAST POSITIONS AND MAX WINDS
INIT 16/1500Z 17.5N 153.3W 40 KT 45 MPH
12H 17/0000Z 17.3N 156.4W 35 KT 40 MPH
24H 17/1200Z 17.2N 160.3W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 18/0000Z...DISSIPATED
$$
Forecaster Jelsema/Gibbs
NNNN