Storm Prediction Center Mesoscale Discussion 1970

   Mesoscale Discussion 1970
   NWS Storm Prediction Center Norman OK
   0322 PM CDT Thu Aug 13 2026

   Areas affected...central to southern Indiana to the Ohio River

   Concerning...Severe Thunderstorm Watch 582...

   Valid 132022Z - 132145Z

   The severe weather threat for Severe Thunderstorm Watch 582
   continues.

   SUMMARY...A threat of severe wind gusts and marginal hail will
   persist into central to southern Indiana.

   DISCUSSION...A cluster of storms on the southern periphery of the
   dying MCS has remained relatively strong/persistent today across
   central IL, and is now moving into IN. These storms continue to
   track along the instability gradient, with access to a very moist
   air mass (PWAT > 2.20") and around 3000 J/kg MLCAPE.

   Recent radar trends show other storms developing ahead/southeast of
   the main storm cluster, indicative of the uncapped air mass.
   Low-level wind fields are weak, but at least some rightward
   propagation is possible into the peak heating hours. Localized
   severe wind gusts will remain the main threat, though marginal hail
   may occur from time to time.

   ..Jewell.. 08/13/2026

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

   ATTN...WFO...ILN...LMK...IND...ILX...

   LAT...LON   39958722 39318511 38998502 38698517 38628559 38638661
               38898701 39488757 39698778 39958722 

   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN