Mesoscale Discussion 0734
   NWS Storm Prediction Center Norman OK
   0336 PM CDT Tue May 16 2017

   Areas affected...Eastern TX/Ok panhandles...Western OK

   Concerning...Tornado Watch 220...

   Valid 162036Z - 162130Z

   The severe weather threat for Tornado Watch 220 continues.

   SUMMARY...Tornado threat should increase across the eastern TX
   Panhandle over the next few hours.

   DISCUSSION...Boundary-layer lapse rates are steepening along the
   immediate moist side of the dry line as considerable breaks in cloud
   cover are noted across the eastern TX Panhandle.  As surface
   temperatures warm, buoyancy is increasing across moist upslope
   regions of the southern High Plains.  Over the last half hour or so,
   convection has markedly increased from Briscoe County to Gray
   County.  It appears discrete supercells should mature across this
   region over the next few hours and attendant tornado threat should
   increase, especially along/north of a boundary draped from Childress
   County to Armstrong County.

   ..Darrow.. 05/16/2017

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

   ATTN...WFO...OUN...DDC...LUB...AMA...

   LAT...LON   33410172 37010114 37019915 33409980 33410172