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ACUS11 KWNS 231713
SWOMCD
SPC MCD 231713=20
CAZ000-NVZ000-232315-
Mesoscale Discussion 2055
NWS Storm Prediction Center Norman OK
1113 AM CST Thu Dec 23 2021
Areas affected...high elevations of the Sierra Nevada
Concerning...Heavy snow=20
Valid 231713Z - 232315Z
SUMMARY...Snowfall rates in excess of 2 inches per hour are expected
this morning and afternoon above 7000 to 8000 feet within the
discussion area.
DISCUSSION...Latest water vapor image shows a long fetch of very
moist air aloft streaming northeastward into northern and central
California, on the southeast periphery of a sharp, positively
tilted, southward-moving upper trough over the eastern Pacific.=20
With this deep-layer, moist, west-southwesterly flow perpendicular
to, and impinging on, the Sierra Nevada, persistent, heavy
precipitation is ongoing.
Latest observations suggest that temperatures remain above freezing
-- and precipitation in the form of rainfall -- at the 6000 to 6500
foot level (TRK/TVL/BIH/BLU). However, with gradual cooling aloft
as the trough shifts southward, expect snowfall levels to gradually
decrease -- supporting heavy snowfall rates, at least above 7000
feet or so. The heavy snow will continue through the afternoon,
given the persistence of the upslope-induced ascent, shifting
gradually southward with time.
..Goss.. 12/23/2021
...Please see
https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tp2M_W6_RUf2WOHkUGgppoehpd73fXb5azHSdebK7cqbw1gh_OGgQE-RaPdC6OZMgwuh9dOx$=
for graphic product...
ATTN...WFO...VEF...REV...HNX...STO...
LAT...LON 37601951 38031960 38221991 38371992 38552023 38872027
39252043 39612077 39782090 39952088 39812052 39532023
39142003 38781977 38231918 37791899 37311849 36791847
36781875 37091907 37471913 37601951=20
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