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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