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Mesoscale Discussion 154
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MD 154 graphic

   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

   ..Peters.. 03/20/2018

   ...Please see for graphic product...


   LAT...LON   32868514 33108466 33128394 33068343 33088302 33268259
               33238228 32888237 32558257 32478350 32578433 32698508

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