ACUS11 KWNS 011235
SWOMCD
SPC MCD 011235
INZ000-ILZ000-IAZ000-MOZ000-011700-

Mesoscale Discussion 0007
NWS Storm Prediction Center Norman OK
0635 AM CST Fri Jan 01 2021

Areas affected...extreme northeast MO...southeast IA...central and
northern IL into northwest IN

Concerning...Freezing rain

Valid 011235Z - 011700Z

SUMMARY...Periods of moderate to heavy freezing rain will continue
across far northeast MO into central IL and parts of northwest IN
early this morning. Precipitation rates will increase across
northern IL over the next couple of hours.

DISCUSSION...A band of freezing rain, moderate to heavy at times,
will continue from far northeast MO into central IL and northwest IN
the next couple of hours. As the upper low over OK continues to
eject northeast this morning, a strong deformation zone will lift
northward across the northern IL vicinity. Meanwhile, strong warm
advection in the 850-700 mb layer will continue to support efficient precipitation rates over a shallow near-surface cold layer around
26-32 degrees F. Freezing rain rates have been as high as 0.05
inches per hour for brief periods early this morning, but overall
rates of around 0.03-0.05 inches per 3 hour period are more
widespread. Some areas could see brief instances of snow or sleet
mixing with freezing rain, especially as the upper low tracks closer
to the region and midlevel temperatures cool sufficiently later this
morning toward midday.

..Leitman.. 01/01/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!qIJnrDBoZbaRbJciYFpHIIQFhvvBscB6_Le8cqWAX7ogUqrU1bK3tm0gg8o0zDvgJ-erCxS-$
for graphic product...

ATTN...WFO...IWX...IND...LOT...ILX...LSX...DVN...

LAT...LON 40439171 40899129 41119106 41429018 41618887 41608808
41588763 41458729 41248701 40998681 40578695 40268744
39918819 39728911 39539020 39659118 40029179 40279183
40439171
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