Storm Prediction Center Mesoscale Discussion 336

   Mesoscale Discussion 0336
   NWS Storm Prediction Center Norman OK
   0426 PM CDT Thu Apr 02 2026

   Areas affected...eastern IA into northwest IL

   Concerning...Tornado Watch 89...

   Valid 022126Z - 022300Z

   The severe weather threat for Tornado Watch 89 continues.

   SUMMARY...An enhanced corridor of tornado potential will exist
   across far eastern Iowa into far northwest Illinois over the next
   couple of hours.

   DISCUSSION...A robust bowing segment has developed near a surface
   low across eastern IA. Ahead of this intense line of convection,
   isolated supercells are noted, with one over Washington County IA
   having recently produced a spotter-confirmed tornado. Additional
   cells are developing along the MS River within mid 60s F dewpoints
   and 0-1 SRH greater than 250 m2/s2. Instability near 1000 J/kg is
   noted in latest mesoanalysis as a warm front continues to lift
   northward into southern WI. This corridor will support an enhanced
   risk of tornado potential over the next couple of hours as storms
   continue to mature and move northeast.

   ..Leitman.. 04/02/2026

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

   ATTN...WFO...LOT...ILX...MKX...DVN...ARX...

   LAT...LON   41699183 42049154 42299126 42409097 42529064 42559019
               42468964 42298947 41908955 41568974 41189006 41049047
               41009124 41279190 41699183 

   MOST PROBABLE PEAK TORNADO INTENSITY...120-150 MPH
   MOST PROBABLE PEAK WIND GUST...65-80 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN