Subj : MESO: Mesoscale Discussion 0143
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Feb 09 2023 15:49:17

ACUS11 KWNS 091549
SWOMCD
SPC MCD 091548=20
WIZ000-ILZ000-IAZ000-091945-

Mesoscale Discussion 0143
NWS Storm Prediction Center Norman OK
0948 AM CST Thu Feb 09 2023

Areas affected...Eastern Iowa into southwest Wisconsin

Concerning...Heavy snow=20

Valid 091548Z - 091945Z

SUMMARY...Periods of moderate to heavy snow will persist through
early afternoon across eastern Iowa into southwest Wisconsin as
low-level evaporative cooling allows for a transition from rain to
snow.

DISCUSSION...Web cams from across eastern IA and southwest WI show
areas of heavy snowfall with visibility reductions down to 1/2 to
1/4 mile, and recent LSRs from the region report quick snowfall
accumulations between 1-1.5 inches over the past 1-2 hours under a
concentrated snow band. These observations are supported by recent
ASOS reports of similar visibility reductions concurrent with
moderate to heavy snowfall as temperatures fall to near 32 F under
the band. Recent radar trends from KDVN show a weakening trend in
the ongoing band; however, strong ascent associated with the passage
of an upper wave, combined with more focused mesoscale ascent driven
by low-level isentropic ascent and frontogenetical lift in the
850-700 mb layer, is expected to persist well into the afternoon as
the system lifts to the northeast, maintaining the potential for
additional heavy snow bands.

While most locations remain above freezing, strong evaporative
cooling coincident with the heaviest precipitation will allow for a
transition from rain/wintry mix to moderate/heavy snow with snowfall
rates between 1-2 inches per hour. Although the most intense
snowfall rates will likely be concentrated spatially, additional
visibility reductions and snow accumulations are possible if/where
additional snow bands develop through the afternoon.

...Moore.. 02/09/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!9VBQjseb3GRg-qtALtKyJvOsIJstnqKTgyoDJRBwPvORj4IyVjWMJeeY5uHvVT0P-GRR3g1o1=
hv9r7oJSwsh_YIAJJA$  for graphic product...

ATTN...WFO...LOT...MKX...DVN...ARX...

LAT...LON   41109207 41829209 42459171 42969096 43159049 43309004
            43328963 43108924 42808908 42618915 42388939 41989018
            41639074 41249104 40969118 40849136 40819165 40869199
            41109207=20


=3D =3D =3D
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