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Mesoscale Discussion 783
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   Mesoscale Discussion 0783
   NWS Storm Prediction Center Norman OK
   0245 PM CDT Fri May 19 2017

   Areas affected...Big Country of TX

   Concerning...Tornado Watch 246...

   Valid 191945Z - 192045Z

   The severe weather threat for Tornado Watch 246 continues.

   SUMMARY...Tornado threat continues across WW246.

   DISCUSSION...Boundary-layer has been slow to warm across much of
   north-central TX this afternoon, though strong sunshine has
   contributed to significant heating across southwest TX into the TX
   south plains where sfc-3km lapse rates now exceed 9 C/km.  Earlier
   outflow boundary that approached Tarrant County has stalled and
   currently extends across Grayson-Denton-Jack Counties. 
   Thunderstorms have concentrated north of this boundary aided in
   large part to low-level warm advection.  However, isolated
   supercells continue to generate south of the boundary across WW246
   along the eastern edge of steeper lapse rate plume where CINH is
   relatively weak.  Latest visible satellite imagery suggests
   additional thunderstorm activity will soon evolve as towering cu
   currently extends as far south as eastern Crockett County.

   ..Darrow.. 05/19/2017

   ...Please see for graphic product...


   LAT...LON   31100121 32860094 32879888 31099915 31100121 

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