Mesoscale Discussion 0154
NWS Storm Prediction Center Norman OK
0136 AM CDT Tue Mar 20 2018
Areas affected...Central GA
Concerning...Tornado Watch 15...
Valid 200636Z - 200800Z
The severe weather threat for Tornado Watch 15 continues.
SUMMARY...Strong, damaging wind gusts remain the primary threat with
the line of storms moving across east-central GA, exiting the
southeast part of WW 15 by 07Z. Meanwhile, large hail and locally
strong winds will be possible during the overnight to early this
morning across central GA.
DISCUSSION...Trends in surface observations indicated moistening of
the boundary layer persists across central GA. This trend will
continue overnight, aiding in additional destabilization ahead of
the central GA MCS, as a strengthening southwesterly low-level jet
from southern GA into southern SC maintains higher theta-e
advection. Moderate instability residing south of the MCS per
objective analyses will be fed into the storms extending from
Jefferson County to Harris County as these storms track to the
east-southeast. The leading line of storms extending from Richmond
to Washington Counties will advance to the east-southeast at 35 kt,
posing a threat for damaging winds, as the downstream environment
destabilizes. Meanwhile, trends in the JGX radar showed a composite
outflow boundary advancing southward from the trailing broken band
of storms, which extended west from Washington to Meriwether and
northern Harris counties. This suggests the tornado potential
should continue to diminish with the trailing portion of the MCS,
though large hail and locally strong winds will remain possible
given the presence of moderate instability and strong effective bulk
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 32868514 33108466 33128394 33068343 33088302 33268259
33238228 32888237 32558257 32478350 32578433 32698508