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Mesoscale Discussion 163
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MD 163 graphic

   Mesoscale Discussion 0163
   NWS Storm Prediction Center Norman OK
   0510 PM CDT Tue Mar 20 2018

   Areas affected...Coastal GA/SC

   Concerning...Tornado Watch 18...

   Valid 202210Z - 202315Z

   The severe weather threat for Tornado Watch 18 continues.

   SUMMARY...An isolated severe threat across coastal Georgia/South
   Carolina will shift offshore over the next hour or so. Tornado Watch
   18 should be able to expire as scheduled at 23Z.

   DISCUSSION...A broken band of convection that developed this
   afternoon ahead of a shortwave trough across the TN Valley will
   shift offshore of coastal GA/SC in the next hour or so. Until this
   occurs, an isolated severe threat will continue across WW 18, as a
   moist low-level airmass remains ahead of a surface cold front, and
   strong mid-level winds and related effective bulk shear support
   supercell structures. Large hail, damaging winds, and perhaps a
   tornado remain possible in the near-term. Given the current speed of
   ongoing convection, the severe threat should diminish over land
   around 23Z. Therefore, WW 18 should be able to expire as scheduled.

   ..Gleason.. 03/20/2018

   ...Please see for graphic product...


   LAT...LON   31168161 31328187 32358070 33278009 33807967 33357870
               31958000 31258073 30938115 31168161 

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