Storm Prediction Center Mesoscale Discussion 2240

   Mesoscale Discussion 2240
   NWS Storm Prediction Center Norman OK
   0216 PM CST Sat Nov 29 2025

   Areas affected...parts of the Midwest

   Concerning...Heavy snow 

   Valid 292016Z - 300015Z

   SUMMARY...Bursts of moderate to heavy snow are most likely to evolve
   east/northeast from central Illinois across parts of
   central/northern Indiana towards the Michigan/Ohio border into this
   evening. Snowfall rates around 1 inch per hour are probable, briefly
   near 2 inches per hour possible, before waning tonight.

   DISCUSSION...Within a broad swath of snow across parts of the
   Midwest, bursts of moderate to heavy intensity appear likely to
   persist north of the mixed-phase region centered on southern IL.
   This has been accompanied by early-afternoon lightning flashes in a
   confined corridor into central IL. With the dendritic growth zone
   centered around 550 mb, mid-level ascent is largely progged to be
   stronger eastward within the mixed-phase precip swath closer to the
   OH Valley. Bulk of guidance suggests ascent will wane after sunset
   farther north as the leading shortwave impulse dampens. Until that
   occurs, snowfall reduced visibilities from a quarter to half-mile
   per Springfield, Lincoln, Decatur, and Champaign IL observations
   should shift northeastward. This setup should support initial
   snowfall rates of 1-2 in/hr, becoming more localized near 1 in/hr
   later.

   ..Grams.. 11/29/2025

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

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

   LAT...LON   40028869 40628774 41928549 42018475 41478432 40868466
               39578615 39288769 39498839 40028869