Storm Prediction Center Mesoscale Discussion 301

   Mesoscale Discussion 0301
   NWS Storm Prediction Center Norman OK
   1129 PM CDT Mon Mar 30 2026

   Areas affected...Central Iowa to southern Lake Michigan

   Concerning...Severe Thunderstorm Watch 77...

   Valid 310429Z - 310630Z

   The severe weather threat for Severe Thunderstorm Watch 77
   continues.

   SUMMARY...Large hail threat continues with storms tonight, along
   with some risk for gusty winds.

   DISCUSSION...Back edge of a short-wave trough appears to extend from
   southwest MN-eastern NE. Scattered deep convection has developed
   ahead of this feature, partially aided by a strong but veered LLJ.
   Sustained low-level warm advection will continue much of the night
   along this corridor so new development is possible in addition to
   the two main clusters that are currently observed. Latest MESH data
   suggests large hail is noted within the stronger updrafts in these
   clusters, and this should be the primary concern into the early
   morning hours.

   ..Darrow.. 03/31/2026

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

   ATTN...WFO...LOT...MKX...DVN...ARX...DMX...

   LAT...LON   42549463 42878745 41438746 41109466 42549463 

   MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN