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Mesoscale Discussion 90
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   Mesoscale Discussion 0090
   NWS Storm Prediction Center Norman OK
   0139 PM CST Sat Feb 24 2018

   Areas affected...Northeast TX to Central AR

   Concerning...Tornado Watch 4...

   Valid 241939Z - 242145Z

   The severe weather threat for Tornado Watch 4 continues.

   SUMMARY...Tornado threat continues across much of ww4.

   DISCUSSION...Large-scale forcing is spreading across the central
   Plains and this appears partly responsible for surface low migrating
   into west-central AR as of 19z...just east of FSM. Attendant warm
   front has advanced into northern portions of ww4 and surface low
   should track along this boundary toward the MO Bootheel later this
   afternoon as pressure falls focus across this region. LLJ has
   strengthened across the Arklatex and shear profiles remain very
   favorable for supercells and potential tornadoes. While the warm
   front should continue to focus convection, especially just ahead of
   the surface low, robust convection should increase south of the low
   along the surging cold front over the next few hours. Damaging winds
   will become increasingly likely with surging line segments that
   mature along the cold front. Otherwise, tornado threat continues,
   especially with supercells.

   ..Darrow.. 02/24/2018

   ...Please see for graphic product...


   LAT...LON   34189575 35889124 33579124 31869574 34189575 

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