Mesoscale Discussion 1603
   NWS Storm Prediction Center Norman OK
   0829 PM CDT Thu Aug 27 2020

   Areas affected...northeast Arkansas...western Tennessee...Missouri
   Bootheel

   Concerning...Tornado Watch 458...

   Valid 280129Z - 280330Z

   The severe weather threat for Tornado Watch 458 continues.

   SUMMARY...The risk for an isolated tornado may persist for a few
   more hours across a small part of northeast Arkansas, western
   Tennessee, northern Mississippi, and the Missouri Bootheel.

   DISCUSSION...A long-lived arcing band of storms with periodic areas
   of rotation continues to expand north/northeastward away from the
   center of Laura. Pressure falls are noted ahead of the line, along
   with 0-1 SRH now down into the 200-300 m2/s2 range. The air mass
   remain very moist, and sufficiently unstable to support isolated
   severe storms and capable of strong wind gusts and brief tornadoes.

   The boundary layer will continue to gradually cool this evening,
   which will reduce buoyancy overall. In the near term, the greatest
   relative risk appears to be from Lawrence County AR southeastward
   into northern MS.

   ..Jewell.. 08/28/2020

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

   ATTN...WFO...PAH...MEG...LZK...

   LAT...LON   34348981 34888987 35589048 35799085 35899154 36069158
               36229142 36599033 36708953 36488922 35598938 34918943
               34468961 34348981