|Mesoscale Discussion 220|
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Mesoscale Discussion 0220
NWS Storm Prediction Center Norman OK
0100 AM CDT Wed Apr 04 2018
Areas affected...Eastern Alabama...Northwest Georgia...Eastern
Tennessee...Western North Carolina...Far Western Virginia
Concerning...Severe Thunderstorm Watch 34...35...
Valid 040600Z - 040745Z
CORRECTED FOR SOUNDING TIME
The severe weather threat for Severe Thunderstorm Watch 34, 35
SUMMARY...A severe threat for wind damage and hail will likely
continue for a few more hours with the stronger parts of a line
moving through the southern and central Appalachians. Additional WW
issuance will likely not be needed. Any lingering severe threat can
be handled by a local extension.
DISCUSSION...Latest radar imagery shows a squall line from eastern
Kentucky extending south-southwestward across eastern Tennessee into
far northwest Georgia and central Alabama. The strongest instability
is located ahead of the southern part of the line where MLCAPE
values are between 500 and 1000 J/kg as evidenced by the 05Z
Birmingham sounding. For this reason, the line may retain a marginal
wind-damage threat for a few more hours as it moves eastward across
eastern Alabama, northwestern Georgia and eastern Tennessee.
Locations just to the east of the watch may need to a local
extension in area and time issued.
On the northern part of the line, instability is very weak across
western Virginia. Although a marginal wind-damage threat could
linger, this part of the line should weaken quickly as it moves into
the higher terrain of the central Appalachians.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 32328591 32208638 32288686 32508710 32918688 33378625
33888565 35108478 36648326 36858267 36648214 36088206
34328361 32858501 32328591
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