Mesoscale Discussion 0589
   NWS Storm Prediction Center Norman OK
   0938 PM CDT Thu May 14 2020

   Areas affected...southeast Iowa and northwest Illinois

   Concerning...Severe Thunderstorm Watch 183...

   Valid 150238Z - 150330Z

   CORRECTED FOR GRAPHIC ISSUES

   The severe weather threat for Severe Thunderstorm Watch 183
   continues.

   SUMMARY...The threat for severe wind and hail continues within the
   WW183 area. The greatest near-term risk for severe wind will be
   across portions of northwest IL.

   DISCUSSION...Recent radar trends continue to show a cluster of
   storms moving across southeast IA becoming more organized into an
   MCS as they move east/northeastward along a diffuse low-level warm
   front and instability gradient. Wind damage has already been noted
   with this group of storms, and given a supportive convective
   environment (1000-2000 J/kg MLCAPE with 30-40 knots of effective
   bulk shear), the near-term threat for strong winds will continue
   into portions of northwest IL. Further east, a cluster of initially
   discrete storms has begun to grow upscale as storm interactions
   occur. These storms will continue to pose an isolated wind and hail
   threat. Overall, the severe threat will continue for the next
   several hours, but boundary layer stabilization will slowly mitigate
   the severe potential heading into the overnight hours.

   ..Moore.. 05/15/2020

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

   ATTN...WFO...ILX...DVN...

   LAT...LON   41389137 41599097 41669039 41608985 41248964 41018979
               40869026 40839089 40929132 41389137