Storm Prediction Center Mesoscale Discussion 361

   Mesoscale Discussion 0361
   NWS Storm Prediction Center Norman OK
   0540 PM CDT Wed Apr 02 2025

   Areas affected...Portions of northeastern Illinois and northwestern
   Indiana

   Concerning...Tornado Watch 99...

   Valid 022240Z - 030015Z

   The severe weather threat for Tornado Watch 99 continues.

   SUMMARY...Favorable corridor for tornadoes and damaging winds is
   evident over the northern portion of Tornado Watch 99 from northeast
   Illinois into northwest Indiana through at least 00Z.

   DISCUSSION...A band of supercell clusters are tracking northeastward
   from northeastern Illinois into northwestern Indiana. These storms,
   along with warm-advection-driven evolving convection to the east,
   are moving into an environment characterized by lower 60s dewpoints
   and large clockwise-curved low-level hodographs (around 500 m2/s2
   0-500m SRH per IWX VWP) along/south of the warm front draped across
   northern Indiana. Despite a somewhat messy mode, this environment
   may support an uptick in the intensity of supercell clusters over
   the next hour or two, with an accompanying risk of tornadoes and
   damaging wind gusts. Any supercells that can organize/intensify in
   this zone would be capable of producing a strong tornado, though the
   aforementioned mode evolution casts uncertainty in this scenario
   unfolding at this time.

   ..Weinman.. 04/02/2025

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

   ATTN...WFO...IWX...IND...LOT...ILX...

   LAT...LON   40178838 40998775 41298743 41538686 41468638 41258594
               40948584 40578598 40178648 39908708 39808765 39988821
               40178838 

   MOST PROBABLE PEAK TORNADO INTENSITY...120-150 MPH
   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN