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  • MESO: Mesoscale Discussion 2025

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Dec 13 23:01:28 2021
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    ACUS11 KWNS 132301
    SWOMCD
    SPC MCD 132301=20
    CAZ000-NVZ000-140300-

    Mesoscale Discussion 2025
    NWS Storm Prediction Center Norman OK
    0501 PM CST Mon Dec 13 2021

    Areas affected...the central Sierra

    Concerning...Heavy snow=20

    Valid 132301Z - 140300Z

    SUMMARY...Snowfall rates in excess of 2 inches per hour are expected
    above 5000 to 5500 feet with snowfall rates possibly as high as 4
    inches per hour above 6000 feet.

    DISCUSSION...A strong atmospheric river has been bringing
    low-elevation heavy rain and mountain snow to much of northern and
    central California through the day today. Cooler air has moved in
    aloft with snow levels now dropping below 5500 feet based on central
    Sierra observations. Expect these to continue to fall through the
    evening. Simultaneously, a renewed push of heavy precipitation can
    be seen on composite radar reflectivity across coastal and central
    California around 2230Z. In addition, guidance indicates the
    low-level jet is expected to strengthen from around 50 knots to 55
    to 60 knots and veer more southwesterly. This will lead to
    increasing upslope flow which will further enhance already heavy
    precipitation. Therefore, very heavy to extreme snowfall rates are
    expected with the greatest rates expected between 23Z and 08Z.

    ..Bentley.. 12/13/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vAZ9VnPySgbIEbRBCHWjmMlgvJ_NZM1QPepCBvQjvH_enmgR4ygx_Vm1IIpwQXnFbRMuJuF-$=
    for graphic product...

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

    LAT...LON 38061899 37411838 36881836 36851895 37451961 37952006
    38622053 39092068 39612093 39872075 39812046 39472020
    39251999 38931986 38641956 38381927 38061899=20



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