• MESO: Mesoscale Discussion 0390

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Apr 15 20:51:52 2021
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    ACUS11 KWNS 152051
    SPC MCD 152051=20

    Mesoscale Discussion 0390
    NWS Storm Prediction Center Norman OK
    0351 PM CDT Thu Apr 15 2021

    Areas affected...Northeast Colorado

    Concerning...Heavy snow=20

    Valid 152051Z - 160045Z

    SUMMARY...Moderate to heavy snow, including rates up to 2 inches per
    hour, may develop near the I-76 corridor of northeast Colorado
    through 5-8 PM MDT.

    DISCUSSION...A broad mid-level low is in the process of gradually
    shifting east of the Great Basin into the Wyoming/Colorado Rockies.=20
    As this continues through late afternoon and early evening,
    large-scale ascent is forecast to develop and intensify across the
    Platte Basin/Interstate 76 vicinity. Forcing for ascent will be
    supported by strengthening lower/mid tropospheric warm advection,
    beneath increasingly difluent upper flow. Latest model forecast
    soundings suggest lift will become maximized within and and above
    favorably cold mid-levels supportive of large dendritic ice crystal
    growth. At the same time, near surface winds are forecast to
    gradually back to a northeasterly component, contributing to weak
    low-level cold advection.

    As this occurs, moderate to heavy snow in excess of 1 inch per hour
    appears likely to develop. Recent runs of the Rapid Refresh have
    indicated the development of rates approaching 2 inches per hour are
    possible across an area focused around Fort Morgan, Sterling and
    Akron as early as 23-00Z.

    ..Kerr.. 04/15/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!oAyq20ePnVFQ8bNqW-g8cpMQ2x9HFURrtlxtONNL4UsDQ0selLz57xb-B1fu66P1xSdj82lP$=
    for graphic product...


    LAT...LON 40420473 40980367 41120284 40550243 39830373 39880499

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