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ACUS11 KWNS 211210
SWOMCD
SPC MCD 211210
GAZ000-ALZ000-211415-

Mesoscale Discussion 1117
NWS Storm Prediction Center Norman OK
0710 AM CDT Sat Jul 21 2018

Areas affected...Central into south-central GA and northeast and
eastern AL

Concerning...Severe Thunderstorm Watch 297...

Valid 211210Z - 211415Z

The severe weather threat for Severe Thunderstorm Watch 297
continues.

SUMMARY...An ongoing forward-propagating line of storms is expected
to advance south through the remainder of the Georgia and eastern
Alabama portion of WW 297 through 14Z, and should exit the Georgia
portion by 13Z. If severe-weather threat persists at that time in
central Georgia, then a tier or two of counties will need to be
added by local extension across south-central Georgia.

DISCUSSION...Trends in mosaic radar imagery through 12Z showed a forward-propagating line of storms extending generally east-west
from Putnam to Heard Counties GA to Randolph to Calhoun Counties AL.
These storms were tracking to the south/southeast along a moderately
strong instability gradient at a forward speed between 35-40 kt. At
this storm motion, locally strong wind gusts are possible. However,
the current presence of surface-based inhibition may be temporarily
limiting that severe-weather threat.

There is precedence to maintain the current watch and add downstream
counties, as the onset of diabatic heating given generally clear
skies south of the ongoing line of storms should aid in the removal
of the inhibition. This heating will also destabilize the
environment through the morning, suggesting a new
severe-thunderstorm watch would need to be considered across
southern GA, with a similar threat for damaging winds.

..Peters.. 07/21/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...CHS...CAE...JAX...FFC...TAE...BMX...HUN...

LAT...LON 31918490 32448586 33248633 33918651 34268644 34758652
34868621 34128548 34028529 33698462 33588362 33768299
32908229 32488217 31858225 31668315 31918490



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