Mesoscale Discussion 0452
NWS Storm Prediction Center Norman OK
0647 PM CDT Wed Apr 05 2017
Areas affected...Central and eastern Kentucky...central and eastern
Tennessee...eastern Alabama...and northwestern Georgia
Concerning...Tornado Watch 127...
Valid 052347Z - 060045Z
The severe weather threat for Tornado Watch 127 continues.
SUMMARY...Scattered thunderstorms capable of all severe modes
continue across the region at this time. Local spatial extensions
of the watch may be needed as storms approach eastern Tennessee and
eastern Kentucky over the next hour or so.
DISCUSSION...The severe weather threat continues across portions of
WW 127 just ahead of a surface trough/dryline that extends from
central Kentucky southward to near Selma, Alabama. Storms just
ahead of this trough have developed into broken bands with
occasional mesocyclones and bow echoes across central Kentucky. The
presence of backed low-level flow across this region and around 1000
J/kg MUCAPE has fostered updraft rotation in a few of the more
isolated cells.
Farther south, more cellular convection has developed amidst a
weakly capped, moderately unstable airmass. A few mesocyclones have
developed with the stronger storms, although somewhat veered flow in
Alabama has fostered splitting supercells and have perhaps hindered
the tornado threat there somewhat. Furthermore, low-level backed
flow in portions of far eastern Alabama and northern Georgia has
occurred amidst cooler surface temperatures as the region remains
influenced by an ongoing MCS farther east across South Carolina.
Thus far, storms have not been able to take advantage of the more
backed low-level flow, likely owing to cellular convection becoming
quickly elevated once the move into the rain-cooled airmass over
Georgia. The tornado potential still remains with this activity,
especially as cells cross into this rain-cooled airmass. Damaging
wind gusts and especially large hail remain likely with this
activity.
With time, storms across KY/TN portions of WW 127 will reach
Nevertheless, very large hail, and a few
..Cook/Guyer.. 04/05/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PBZ...RLX...CLE...JKL...ILN...
LAT...LON 40448304 40618273 40668205 40508140 40068090 39368089
38788106 37828156 37508176 37338210 37438265 37478310
37598347 37798368 38008373 38298352 38508319 40448304
Read morefrom SPC Forecast Products http://ift.tt/I4wb5w
No comments:
Post a Comment