Subj : MESO: Mesoscale Discussion 2062
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Dec 22 2022 17:00:15

ACUS11 KWNS 221700
SWOMCD
SPC MCD 221659=20
ILZ000-MOZ000-IAZ000-222100-

Mesoscale Discussion 2062
NWS Storm Prediction Center Norman OK
1059 AM CST Thu Dec 22 2022

Areas affected...Eastern Missouri to western Illinois

Concerning...Snow Squall=20

Valid 221659Z - 222100Z

SUMMARY...Sporadic, short-lived blizzard/snow squall conditions will
be possible under a mesoscale snow band as it tracks east across
parts of eastern Missouri and western Illinois through early/mid
afternoon.

DISCUSSION...Recent surface observations from far eastern IA show
visibility reductions down to 1/4 mile at times under a persistent,
though loosely organized, snow band. Based on latest RAP
mesoanalysis, this band is primarily being driven by broad scale
ascent ahead of a deepening upper low over the central Plains,
augmented by more focused frontogenetical lift within the 850-700 mb
layer. Forecast soundings indicate that much of this lift coincides
with a 100-150 mb deep dendritic growth zone, which is likely
yielding moderate, to at times heavy, snowfall rates up to 1
inch/hour. Concurrently, strong cold advection behind the surface
front is supporting frequent wind gusts between 25-35 knots from
eastern IA to central MO. The combination of these winds and
moderate snowfall rates will likely result in periods of
blizzard/snow squall conditions with visibility reductions briefly
falling to 1/4 mile under the snow band as it continues moving east
through early/mid afternoon.

...Moore.. 12/22/2022

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!5aTps8SDTOeZmCWxuj3rYrcIDvWxPNZEG43VSdm1JhWe85V74znffsjvHcuLy_iwQBr9EhryF=
DPcRPH5LHAUO01y7Gw$  for graphic product...

ATTN...WFO...LOT...ILX...LSX...DVN...SGF...EAX...

LAT...LON   39969175 41699077 42249007 42128917 41658861 40958810
            40208837 38978904 38298989 37559125 37559200 38439313
            38789294 39259244 39969175=20


=3D =3D =3D
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