Storm Prediction Center Mesoscale Discussion 1099

   Mesoscale Discussion 1099
   NWS Storm Prediction Center Norman OK
   0614 PM CDT Thu Jun 11 2026

   Areas affected...central into northeast Illinois into far northwest
   Indiana.

   Concerning...Tornado Watch 313...

   Valid 112314Z - 120045Z

   The severe weather threat for Tornado Watch 313 continues.

   SUMMARY...The tornado threat continues across watch 313 with an
   increasing damaging wind threat this evening.

   DISCUSSION...A broken line of storms has intensified along the front
   within the past hour. Expect this line to continue to intensify
   through the evening as the environment ahead of it continues to
   destabilize. The greatest threat for strong to intense tornadoes
   will likely be with the more discrete storms ahead of the line and
   within the break across north-central Illinois for the next 1 to 2
   hours. By later this evening, the damaging wind threat will become
   more pronounced as this line of storms matures and expands and
   eventually overtakes the discrete storms. Some QLCS and embedded
   supercell tornado threat will exist within the line during the late
   evening, but tornado intensity should be less by that time.

   ..Bentley.. 06/11/2026

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

   ATTN...WFO...LOT...ILX...MKX...LSX...DVN...

   LAT...LON   39899060 40749042 41958976 42838821 42848736 42348698
               41368708 40758744 40328827 39668964 39899060 

   MOST PROBABLE PEAK TORNADO INTENSITY...140-170 MPH
   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN