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Mesoscale Discussion 821
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   Mesoscale Discussion 0821
   NWS Storm Prediction Center Norman OK
   0746 PM CDT Tue May 23 2017

   Areas affected...Southeast GA...Southwest/central SC

   Concerning...Tornado Watch 258...

   Valid 240046Z - 240215Z

   The severe weather threat for Tornado Watch 258 continues.

   SUMMARY...Isolated damaging wind gusts and a tornado or two are
   still possible across portions of southeast GA and southwest SC

   DISCUSSION...Multiple convective lines and clusters continue to move
   quickly across the watch area. A few more discrete cells across
   southeast GA have shown low-level rotation, including a long-lived
   supercell now in Liberty county. Broad low-level confluence is
   expected to continue across the coastal portions of southeast GA and
   southwest SC with enough forcing for ascent and moisture convergence
   to support persistence of the ongoing activity. VAX VAD data
   continues to show an environment supportive of low-level rotation
   and modest storm organization. Recent data from this radar sampled
   0-1 km SRH over 200 m2/s2 and 0-6 km bulk shear near 40 kt. As such,
   damaging wind gusts and a tornado or two are still possible across
   portions of far southeast AL and the coastal counties of southwest
   SC. The tornado threat appears to have diminished across much of the
   remainder of watch area over central SC.

   ..Mosier.. 05/24/2017

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

   ATTN...WFO...CHS...CAE...JAX...FFC...

   LAT...LON   32278246 33248127 33097989 30918181 31058258 32278246 

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