• MESO: Mesoscale Discussion 2055

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Dec 23 17:13:46 2021
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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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