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ACUS11 KWNS 280014
SWOMCD
SPC MCD 280013=20
UTZ000-WYZ000-IDZ000-280215-

Mesoscale Discussion 2066
NWS Storm Prediction Center Norman OK
0613 PM CST Mon Dec 27 2021

Areas affected...Northern Utah

Concerning...Snow Squall=20

Valid 280013Z - 280215Z

SUMMARY...An ongoing snow squall will continue to produce heavy
snow/reduced visibility for at least the next 1-2 hours across
north-central Utah.

DISCUSSION...Radar imagery from the past hour has shown a persistent
snow squall band associated with a cold front moving east/southeast
across northern UT into the Salt Lake City area. Although
temperatures ahead of this band are in the mid/upper 30s, strong
cold advection along/behind the snow band, coupled with wet-bulb
temperatures below freezing, is driving temperature reductions into
the low 30s/upper 20s, wind gusts between 30-40 mph, and reduced
visibility down to 1/2 to 1/4 mile at times. This snow squall is
being supported by a deep layer of steep lapse rates near 8 C/km.
Latest RAP mesoanalysis shows this plume of steep lapse rates
extends well ahead of the band across north-central UT, which will
be supportive of snow squall maintenance. While interactions with
the higher terrain east of Salt Lake City may impede eastward
progress to a degree, upper tilts from KMTX show the snow squall may
extent as high as 11 kft in some locations, suggesting the potential
for continued impacts. Diurnal cooling between 01-02 UTC will likely
reduce low-level lapse rates and mitigate the mixing potential as
well as reduce instability, resulting in a gradual decay of the band
during and after this period.

..Moore.. 12/28/2021

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!v6ugzdXl-T5CTKlcMvnfCmORlpuB--fk5JFoNaMPDTDNpNC2GVhZRXwJtKqzXJZxERChjRcu$=
for graphic product...

ATTN...WFO...RIW...SLC...PIH...

LAT...LON 41531163 42061108 41811063 41321029 40801041 40341105
39971173 39891245 39981306 40171334 40501311 40971228
41531163=20



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