• MESO: Mesoscale Discussion 1996

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Dec 2 15:44:28 2022
    ACUS11 KWNS 021544
    SWOMCD
    SPC MCD 021543=20
    NEZ000-COZ000-WYZ000-021745-

    Mesoscale Discussion 1996
    NWS Storm Prediction Center Norman OK
    0943 AM CST Fri Dec 02 2022

    Areas affected...portions of southeast Wyoming into extreme western
    Nebraska

    Concerning...Snow Squall=20

    Valid 021543Z - 021745Z

    SUMMARY...A snow squall appears to be materializing west of
    Interstate 25 in southeast Wyoming, which may progress eastward in
    the next 1-2 hours. Rapidly reduced visibility, gusty winds, and
    flash freezing is possible.

    DISCUSSION...MRMS mosaic and regional radar imagery depict an eastward-progressing band of snow, with up to 35 dBZ reflectivity
    values recently noted along with recent reports of at least moderate
    snow fall and gusts around 40-60 kts. Recent webcams on I-80 west of
    Laramie, WY have also shown whiteout conditions associated with this
    band of snow. Latest visible satellite imagery shows a pronounced
    line of potentially cumuliform clouds embedded in lower-stratus,
    indicative of low-topped convection and supporting evidence for snow
    squall in progress. Low-level lapse rates preceding this snow squall
    are not particularly steep, raising questions of how long-lived this
    event will be. Nonetheless, at least an hour or two of combined
    rapidly reduced visibility and gusty westerly winds may accompany
    the snow squall for the next 1-2 hours, including when the squall
    passes over Interstate 25.

    ..Squitieri.. 12/02/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!5ZYl5XBPzYs7RmFS8M3xlBvyreFY3FC9wYdSnYeytlfJ0KTdrifpTrR7oeNPLD2IWcAMkoE9y= 4E6Y5pQBDc8BRIZyEc$ for graphic product...

    ATTN...WFO...BOU...CYS...

    LAT...LON 41610324 40720371 40130500 40040563 40210613 40550613
    41140571 41770526 42090469 42150412 41950355 41610324=20


    =3D =3D =3D
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