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