Mesoscale Discussion 0242
   NWS Storm Prediction Center Norman OK
   1146 PM CDT Fri Mar 27 2020

   Areas affected...Central Missouri to Central Illinois

   Concerning...Severe Thunderstorm Watch 66...

   Valid 280446Z - 280615Z

   The severe weather threat for Severe Thunderstorm Watch 66
   continues.

   SUMMARY...Severe hail remains possible with the most robust
   convection across ww66.

   DISCUSSION...Low-level warm advection continues to be the primary
   mechanism by which elevated convection is being generated across the
   mid-MS Valley late this evening. Plume of steep lapse rates extends
   across the southern Plains into MO and new updrafts are developing
   along edge of stronger capping. Thunderstorms have proven efficient
   in generating hail this evening and this should continue well into
   the early-morning hours as significant southwesterly component to
   LLJ is expected. Forecast soundings suggest higher-instability air
   mass should gradually advance north into the pre-dawn hours and this
   could result in stronger thunderstorm clusters lifting north of the
   watch later tonight. Until then, large hail remains likely with
   supercells across ww66.

   ..Darrow.. 03/28/2020

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

   ATTN...WFO...ILX...LSX...SGF...EAX...

   LAT...LON   39389247 40048887 38738887 38099247 39389247