• MESO: Mesoscale Discussion 1686

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Sep 3 00:01:37 2021
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    ACUS11 KWNS 030001
    SWOMCD
    SPC MCD 030000=20
    KSZ000-NEZ000-030130-

    Mesoscale Discussion 1686
    NWS Storm Prediction Center Norman OK
    0700 PM CDT Thu Sep 02 2021

    Areas affected...portions of south central Nebraska into northern
    Kansas

    Concerning...Tornado Watch 487...

    Valid 030000Z - 030130Z

    The severe weather threat for Tornado Watch 487 continues.

    SUMMARY...A couple tornadoes and damaging gusts remain possible with
    the more sustained supercell updrafts over the next few hours.

    DISCUSSION...KUEX and MRMS mosaic radar data depict multiple
    supercells with transient low-level rotation in progress from
    Kearney to Harlan Counties in NE, with more isolated attempts at
    updraft intensification noted as far southwest as Gove County KS.
    These storms are moving into a partially modified airmass, where
    1500+ J/kg MLCAPE are common, but within a narrow corridor ahead of
    the storms. However 50+ kts of effective bulk shear and 200+ m2/s2
    effective SRH are present within this narrow corridor, which will
    promote additional instances of low-level rotation supporting brief
    tornado and damaging gust potential with the more robust,
    longer-lived supercells, especially along the KS/NE border.

    ..Squitieri/Guyer.. 09/03/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vd9QXlkXlByVY4MiVG1bHVnKKiDAr-tB1ByrM44f8-KGIwhzKQWHmlx1Ti6tYePoBiIzpFKN$=
    for graphic product...

    ATTN...WFO...TOP...ICT...GID...LBF...DDC...GLD...

    LAT...LON 38650076 39569994 40619963 41319928 41509836 41169771
    40569751 39929767 39159810 38769847 38509910 38439966
    38420029 38650076=20



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