Subj : MESO: Mesoscale Discussion 2080
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sat Dec 31 2022 17:41:48

ACUS11 KWNS 311741
SWOMCD
SPC MCD 311741=20
CAZ000-312345-

Mesoscale Discussion 2080
NWS Storm Prediction Center Norman OK
1141 AM CST Sat Dec 31 2022

Areas affected...the higher terrain of the Sierra in northern
California

Concerning...Heavy snow=20

Valid 311741Z - 312345Z

SUMMARY...Heavy snow is expected to increase in coverage across the
higher terrain of the Sierra in northern California through the
afternoon into early evening.

DISCUSSION...A mid-level trough and accompanying stream of deep
moisture continues to impinge on the higher terrain of the Sierra in
northern CA. Strong deep-layer ascent along the windward side of the
Sierra should lift the deep moisture to a saturated dendritic growth
zone, favoring heavy snow production. The depth of the rich
moisture, the presence of weak buoyancy, and combined orographic and
dynamic lift of moist and buoyant air may foster snowfall rates up
to the 3-5 inch/hr range, at least on a localized basis and
particularly above 6000 ft elevations. Latest high-resolution
guidance consensus suggests that the heavier snowfall rates should
begin sometime between 18-20Z and become more widespread in the
higher elevations in the 21-01Z time frame.

...Squitieri.. 12/31/2022

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!-ahiX_2uRW0esHd5e4IEenRmlGMP7WVTLjasjX0Hpa9F0ijdZX63HDfKoUn9B4a8Eofp6JoE3=
3bjPdDw0rLdhptrUOo$  for graphic product...

ATTN...WFO...VEF...REV...HNX...STO...

LAT...LON   39692049 38941999 38391942 38141925 37741893 37481857
            37191831 36961835 36991866 37421925 37921972 38642031
            39062057 39332062 39682064 39692049=20


=3D =3D =3D
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