Mesoscale Discussion 0660
   NWS Storm Prediction Center Norman OK
   0800 PM CDT Thu May 21 2020

   Areas affected...south central Texas

   Concerning...Severe Thunderstorm Watch 199...

   Valid 220100Z - 220230Z

   The severe weather threat for Severe Thunderstorm Watch 199
   continues.

   SUMMARY...A couple clusters of stronger storms have developed across
   portions of WW199. Recent reports of severe hail in SJT, and radar
   trends suggest severe weather will likely remain for the next few
   hours.

   DISCUSSION...Storms have gradually organized over the last few hours
   across WW199. The atmosphere remains unstable with 1000-2000 J/kg of
   MLCAPE. Shear is expected to increase slightly to around 30-35 kt as
   the southwest US shortwave trough continues to overspread the area.
   The low-level jet is also expected to increase over the next few
   hours. The increase in shear may support a few supercell structures
   capable of large hail and strong winds. Storms should begin to
   weaken as increasing nocturnal inhibition limits updraft strength a
   couple hours after sunset. The greatest threat for severe weather
   will likely remain with the well established cluster near SJT, where
   3.0 inch hail was recently reported.

   ..Lyons/Thompson.. 05/22/2020

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

   ATTN...WFO...SJT...LUB...MAF...

   LAT...LON   33370101 33399997 33389949 31079958 31039979 30950014
               30940062 31010101 31100130 32940115 33370101