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Mesoscale Discussion 90
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   Mesoscale Discussion 0090
   NWS Storm Prediction Center Norman OK
   1206 PM CST Sat Jan 21 2017

   Areas affected...portions of central GA into the FL panhandle

   Concerning...Tornado Watch 12...

   Valid 211806Z - 212000Z


   The severe weather threat for Tornado Watch 12 continues.

   SUMMARY...The threat for damaging winds and tornadoes will continue
   across WW 12. Local aerial extension of the watch may be needed
   depending in how fast segments of the line surge eastward.
   Otherwise, trends will be monitored for possible watch issuance in
   the next hour or so for parts of GA/SC.

   DISCUSSION...A robust line of storms extending from central GA
   southwestward into the central FL panhandle will continue to pose a
   threat for damaging winds, and potentially several tornadoes. Over
   the last couple of hours several mesovortex features have been noted
   along the line, especially the GA portion. Effective SRH along the
   line of 200-500 m2/s2 has been noted in 17z mesoanalysis and
   confirmed by regional VWP data. This favorable environment for
   low-level rotation is expected to shift east with the line through
   the afternoon, maintaining the tornado threat. Furthermore, damaging
   winds will also continue to be a concern, especially as line
   segments continue to surge eastward where partly cloudy skies have
   allowed for continued heating and modest steepening of low-level
   lapse rates across southern and eastern GA into the eastern FL
   panhandle. Some local areal extension of the watch may be needed
   depending on where/if segments of the line surge eastward faster
   than expected. Otherwise, a new watch may be needed downstream of WW
   12 across portions of SC and southeast GA in the next hour or so.

   ..Leitman/Hart.. 01/21/2017


   LAT...LON   33728338 33898216 33488134 32738066 31558099 30638241
               29938414 29818477 29718551 30328609 30918557 31438467
               32158401 32818372 33398378 33618367 33728338 

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