Subj : MESO: Mesoscale Discussion 1994
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Dec 01 2022 17:55:22

ACUS11 KWNS 011755
SWOMCD
SPC MCD 011754=20
CAZ000-012200-

Mesoscale Discussion 1994
NWS Storm Prediction Center Norman OK
1154 AM CST Thu Dec 01 2022

Areas affected...northern Sierra Nevada

Concerning...Heavy snow=20

Valid 011754Z - 012200Z

SUMMARY...Heavy snow is likely to continue through this afternoon
along the western slopes of the Sierra Nevada, to the west and
southwest of Lake Tahoe, with rates perhaps peaking on the order of
2-3+ inches per hour during the 1-4 PM PST time frame.

DISCUSSION...In advance of a significant short wave trough still
digging near the northern Pacific coast, a surface cold front is
already in the process of advancing southward across northern into
central California.  This includes the northern Sierra Nevada, with
a continued gradual progress across the higher terrain to the west
and southwest of Lake Tahoe during the next several hours.

As lower-levels gradually cool in the wake of the cold front, models
indicate that strong warm advection will be maintained aloft
(around/above the 700 mb level) into the 21-00Z time frame
along/west of the Sierra Nevada, before the upstream mid-level
troughing turns inland of the Pacific coast.  The latest Rapid
Refresh suggests that heaviest snow rates will be maintained in a
corridor along the higher terrain to the west and southwest of Lake
Tahoe, and may intensify further late this afternoon as lift in the
dendritic growth layer maximizes.  As low-levels cool, forecast
soundings suggest that snow levels may lower toward and below 3000
ft.

...Kerr.. 12/01/2022

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!5OBsLsSCK1HoQizPlMOAjCPEADZyse_b6E_dTZ1R1X7D8NDnDpLun09Sj2BhErQzguyfhh8pC=
dyEopcU-uguQQmeGQc$  for graphic product...

ATTN...WFO...REV...STO...

LAT...LON   39982148 40012074 39082025 38632031 38622070 39052096
            39392122 39982148=20


=3D =3D =3D
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