Mesoscale Discussion 1493
   NWS Storm Prediction Center Norman OK
   0617 PM CDT Fri Aug 14 2020

   Areas affected...Northern Kansas and southern Nebraska

   Concerning...Severe Thunderstorm Watch 438...

   Valid 142317Z - 150045Z

   The severe weather threat for Severe Thunderstorm Watch 438
   continues.

   SUMMARY...Expect storms to continue to build southwestward along the
   front this evening.

   DISCUSSION...A large supercell has continued southward across
   southeast Nebraska this evening with several reports of 1.25 inch
   hail and a few brief tornado reports. Expect additional development
   to continue on the western flank of the ongoing activity along the
   cold front through the evening. The brief tornadoes are likely a
   result of vorticity stretching along the cold front boundary where
   extreme instability (4000-5000 J/kg MLCAPE) is resulting in extreme
   low-level parcel accelerations. A threat for an additional brief
   tornado or two remains possible for the next 2 hours before the
   threat diminishes as the boundary layer cools. A lack of stronger
   upper-level forcing should allow storm activity to gradually weaken
   after sunset with most of the severe weather threat coming to an end
   by 04-05Z.

   ..Bentley.. 08/14/2020

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

   ATTN...WFO...OAX...TOP...ICT...GID...

   LAT...LON   40199907 40679812 40849759 40989668 40579623 39939628
               39509688 39249781 39079852 39169913 39629938 40199907