Storm Prediction Center Mesoscale Discussion 1104

   Mesoscale Discussion 1104
   NWS Storm Prediction Center Norman OK
   0825 PM CDT Thu Jun 11 2026

   Areas affected...southern Illinois into southern and central Indiana

   Concerning...Severe potential...Watch needed soon 

   Valid 120125Z - 120230Z

   Probability of Watch Issuance...95 percent

   SUMMARY...A severe thunderstorm watch is needed soon from southern
   Illinois into parts of southern and central Indiana.

   DISCUSSION...A line of storms continues to move southeast across
   central Illinois. This line of storms will continue southeast
   through the evening. While the severe wind threat will likely not be
   as strong as farther north where the line is more progressive, the
   strong instability and steep lapse rate environment will support a
   damaging wind threat with these storms through the evening. A severe
   thunderstorm watch will be issued soon for this threat.

   ..Bentley/Smith.. 06/12/2026

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

   ATTN...WFO...ILN...LMK...IWX...IND...PAH...ILX...LSX...

   LAT...LON   39088966 39438819 39968669 40378562 40278499 39878491
               39318517 38938579 38508692 38268762 38218840 38348915
               38428950 39088966 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN