Storm Prediction Center Mesoscale Discussion 1174

   Mesoscale Discussion 1174
   NWS Storm Prediction Center Norman OK
   0903 PM CDT Wed Jun 17 2026

   Areas affected...Southeast Illinois into southern Indiana

   Concerning...Tornado Watch 342...344...

   Valid 180203Z - 180330Z

   The severe weather threat for Tornado Watch 342, 344 continues.

   SUMMARY...The corridor of highest tornado potential continues to
   shift eastward across southeastern Illinois and southern Indiana --
   within Tornado Watches 342/344.

   DISCUSSION...An east/west-oriented band of tornadic supercells
   continues tracking east-southeastward across southeastern IL into
   southern IN -- along the southern periphery of a lingering larger
   convective cluster. These storms now have access to fully recovered
   PBL air (upper 70s to lower 80s temperatures amid upper 60s
   dewpoints). Given a large, clockwise curved hodograph sampled by
   nearby VWPs (likely around 600 m2/s2 effective SRH), the tornado
   risk risk (some strong to intense) will continue tonight.

   ..Weinman.. 06/18/2026

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

   ATTN...WFO...IND...ILX...LSX...

   LAT...LON   38708698 38858584 39068553 39398550 39548573 39558612
               39348731 39218886 39078900 38748897 38628856 38618776
               38708698 

   MOST PROBABLE PEAK TORNADO INTENSITY...120-145 MPH
   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN