Mesoscale Discussion 0051
NWS Storm Prediction Center Norman OK
1100 PM CST Sat Jan 24 2026
Areas affected...Southern Illinois into southern Indiana and
southwest Ohio
Concerning...Heavy snow
Valid 250500Z - 251100Z
SUMMARY...Heavy snow band development is anticipated through the
next several hours across portions of the Ohio River Valley.
Snowfall rates exceeding 1 inch/hour appear probable later tonight.
DISCUSSION...A broad band of heavier precipitation is beginning to
emerge from northern AR into the lower OH Valley per regional radar
mosaics over the past 1-2 hours. This comes amid strengthening
frontogenesis through a deep layer (925-700 mb per recent
mesoanalyses) as the primary upper wave begins to migrate eastward
into the southern Plains. Latest forecast guidance shows
intensifying frontogenesis across the lower MS Valley into the OH
Valley through 09-12 UTC, which will support further
organization/intensification of a focused mesoscale precipitation
band. With mid-level temperatures below freezing north of the OH
River, snow should remain the predominant precipitation type.
Moderate snowfall rates will be common with a focused corridor of
higher rates (in excess of 1 inch/hour) likely. Per recent ensemble
guidance, this corridor will most likely emerge across southern IL
into southern IN and southwest OH.
These solutions also depict optimal banding potential during the
09-12 UTC period later tonight into early Sunday morning. However,
recent ASOS/AWOS observations from southern IL and southern IN have
shown an uptick in snowfall intensity (denoted by reduced
visibilities to 1/2 mile or less) over the past hour. These trends
suggest that the onset of heavier snowfall rates may commence
earlier than currently anticipated by most guidance as intermittent
moderate to heavy snow bands becomes more prominent with time.
..Moore.. 01/25/2026