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Mesoscale Discussion 816
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   Mesoscale Discussion 0816
   NWS Storm Prediction Center Norman OK
   0102 PM CDT Tue May 23 2017

   Areas affected...Portions of southern/eastern Georgia and
   southern/central South Carolina

   Concerning...Tornado Watch 257...

   Valid 231802Z - 232000Z

   The severe weather threat for Tornado Watch 257 continues.

   SUMMARY...Storms will continue to advance east/northeast across
   Watch 257 this afternoon, with an attendant threat for a few
   tornadoes and damaging wind gusts. Conditions will likely remain
   favorable for these hazards through the late afternoon and evening
   hours, and a downstream tornado watch will likely be needed within
   the next 1-2 hours.

   DISCUSSION...Surface and mesoanalysis data indicate a weak boundary
   stretching eastward across south-central/southeastern Georgia and
   extending into southern South Carolina. Strong to occasionally
   severe storms have focused along and to the south of this boundary
   within a modestly heated warm sector. Surface observations depict
   pressure falls upwards of 1 mb/hr near the boundary, and weak low
   pressure currently over southeast Alabama will likely evolve
   east/northeast within this corridor through the afternoon and
   evening hours. As such, slight backing of low-level flow will likely
   occur along the boundary in advance of this low, resulting in some
   enhancement of storm-relative helicity. With modest mixed-layer
   buoyancy extending from southern Georgia into portions of South
   Carolina, this wind profile will likely maintain the potential for
   isolated damaging wind gusts and a couple tornadoes. Regional radar
   data have confirmed this ongoing potential, with a recent debris
   signature over eastern Crisp and western Wilcox Counties in Georgia.
   Downstream tornado watch issuance is likely within the next 1-2
   hours.

   ..Picca.. 05/23/2017

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

   ATTN...WFO...ILM...CHS...CAE...JAX...FFC...TAE...

   LAT...LON   32218394 32608313 32788300 33308192 33838096 33888046
               33657978 33207936 32318048 31618143 30598304 30558416
               30898436 31338416 31598410 32218394 

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Page last modified: May 23, 2017
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