Subj : MESO: Mesoscale Discussion 2055
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Wed Dec 21 2022 18:06:10

ACUS11 KWNS 211806
SWOMCD
SPC MCD 211805=20
NEZ000-SDZ000-WYZ000-212100-

Mesoscale Discussion 2055
NWS Storm Prediction Center Norman OK
1205 PM CST Wed Dec 21 2022

Areas affected...Wyoming to southwest South Dakota and northwest
Nebraska

Concerning...Snow Squall=20

Valid 211805Z - 212100Z

SUMMARY...Snow squalls will remain possible across northern and
central Wyoming into portions southwest South Dakota and northwest
Nebraska through the mid-afternoon hours as an arctic front
continues to push south.

DISCUSSION...Latest surface observations continue to show reduced
visibility at or below one-quarter mile across much of central and
northern WY where post-frontal winds are gusting to 45 mph amid
light to moderate snow showers. Across western SD, snow has begun to
increase in coverage as lift along the frontal surface increases.
The combination of light falling snow, sustained winds near 20 mph
(gusting to 30-40 mph), and a pre-existing snow pack are resulting
in sporadic visibility reductions - particularly in open country.=20

The expectation through mid-afternoon is for a continuation of
persistent snow squalls across central WY where stronger winds and
heavier snow rates (bolstered by embedded convective elements) will
yield visibility reductions near/below one-quarter mile. Across
SD/WY, more localized/sporadic post-frontal snow squalls are
expected as strong cold advection continues over the next few hours
and supports deeper downward mixing of 30-45 mph winds. Impacts will
be most notable across open country where blowing snow model output
suggests visibility reductions to one-quarter mile will become more
likely as sustained wind speeds reach the 25-30 mph range.

...Moore.. 12/21/2022

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!_fbAp5DYE8p4O8Mylqw30lClNPcrz-00GblRn8RCXcH797w544iBHXY-NPQta46Cs1zBv9e-E=
FAUsBouVbYDxG7nsbI$  for graphic product...

ATTN...WFO...ABR...LBF...UNR...CYS...BYZ...RIW...

LAT...LON   42570014 42210042 41980121 41790214 41620336 41630436
            41770582 42090734 42500850 42850944 43181000 43511003
            44210994 44690945 44780465 45280259 45040175 44410097
            42570014=20


=3D =3D =3D
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