Mesoscale Discussion 1731
NWS Storm Prediction Center Norman OK
1113 AM CDT Sat Oct 10 2020
Areas affected...Eastern AL...Western GA...FL Panhandle
Concerning...Severe potential...Watch possible
Valid 101613Z - 101815Z
Probability of Watch Issuance...60 percent
SUMMARY...The threat for brief tornadoes associated with Tropical
Depression Delta is expected to increase by early afternoon. Tornado
watch issuance is possible by 17-18Z.
DISCUSSION...At 16Z, T.D. Delta is centered over northwest MS, with
a substantial midlevel dry slot (noted on WV imagery) wrapping into
the southern and eastern portions of the cyclone. The primary
convective band has pushed into central AL and the western FL
Panhandle. Little to no lightning has been observed with this band
throughout the morning, and the generally linear convective mode has
thus far limited the threat for brief tornadoes. However, modest
heating near and south of a northward-moving warm front should
result in gradual destabilization across eastern AL/western GA into
the FL Panhandle over the next several hours. As a result, ongoing
convection may gradually intensify as it spreads eastward, with
additional more cellular development possible ahead of the primary
band by afternoon.
While wind fields will gradually weaken as T.D. Delta continues to
decay this afternoon, effective shear of 35-45 kt should support
some organized structures with any more robust convection this
afternoon. Low-level shear/SRH will support a brief tornado threat,
especially with any semi-discrete convection that can be sustained
in closer proximity to the warm front. Some damaging wind gusts will
also be possible with any of the linear elements within the broader
convective band. Tornado watch issuance is possible by 17-18Z.
..Dean/Thompson.. 10/10/2020
...Please see
www.spc.noaa.gov for graphic product...
ATTN...WFO...FFC...TAE...BMX...MOB...
LAT...LON 31128614 31398620 32368632 33298628 33738599 33998492
33938422 33648396 33198382 32428429 31398485 30858531
30738612 31128614