Tropical Depression KATE (Text)

Tropical Depression Kate Discussion Number  14
NWS National Hurricane Center Miami FL       AL102021
1100 AM AST Tue Aug 31 2021
Strong west-northwesterly shear continues to displace the limited 
convective activity associated with Kate well to the east of its 
center, which is fully exposed and becoming less well-defined in 
visible satellite imagery. A small burst of deep convection from 
earlier this morning appears to be waning, as infrared cloud top 
temperatures are warming to the east of Kate's center. Consensus 
T2.0/30 kt Dvorak classifications from TAFB and SAB, in addition to 
the latest objective UW-CIMSS ADT estimates, suggest that Kate is 
now likely a tropical depression. Therefore, the initial intensity 
is lowered to 30 kt for this advisory.
Kate's center has jogged a little east of due north this morning, 
and its initial estimated 12-h motion is northward, or 010/4 kt. A 
mid-level ridge is forecast to build to the northeast and east of 
Kate later today through Wednesday, which should steer the cyclone 
more north-northwestward through midweek. Then, Kate should turn 
toward the north on Thursday night and early Friday within the flow 
associated with a mid- to upper-level trough that will be moving 
across the western Atlantic. The official NHC forecast track is very 
similar to the previous one, and it lies near the reliable consensus 
aids TVCA and HCCA. The only minor track adjustment has Kate turning 
a little earlier and faster toward the north late this week. 

Even though the vertical shear is expected to diminish over Kate 
during the next 12-24 h, the cyclone remains embedded within a 
relatively dry mid-level environment. This will make it difficult 
for Kate to sustain enough organized convection to strengthen much. 
In fact, numerous models including the GFS, HWRF, and HMON show the 
low weakening in the coming days, as the model simulated satellite 
imagery suggests only sporadic bursts of convection will occur even 
after the shear subsides. However, the possibility of Kate briefly 
re-intensifying into a weak tropical storm cannot be completely 
ruled out, since the cyclone will remain over warm SSTs around 28 
deg C for at least the next couple of days. The official NHC 
intensity forecast remains consistent with the consensus aids IVCN 
and HCCA and shows no explicit change in intensity, although some 
fluctuation is possible. If Kate survives this week, the global 
models indicate that it will likely open up into a trough by 
Saturday morning, shortly before being absorbed by an approaching 
frontal system.
INIT  31/1500Z 23.5N  50.8W   30 KT  35 MPH
 12H  01/0000Z 24.3N  51.0W   30 KT  35 MPH
 24H  01/1200Z 25.7N  51.7W   30 KT  35 MPH
 36H  02/0000Z 27.3N  52.7W   30 KT  35 MPH
 48H  02/1200Z 29.0N  53.6W   30 KT  35 MPH
 60H  03/0000Z 30.7N  54.1W   30 KT  35 MPH
 72H  03/1200Z 32.5N  53.9W   30 KT  35 MPH
 96H  04/1200Z...DISSIPATED
Forecaster Reinhart

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Page last modified: Friday, 31-Dec-2021 12:09:24 UTC