• MESO: Mesoscale Discussion 1835

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Mon Oct 11 23:10:04 2021
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    ACUS11 KWNS 112309
    SPC MCD 112309=20

    Mesoscale Discussion 1835
    NWS Storm Prediction Center Norman OK
    0609 PM CDT Mon Oct 11 2021

    Areas affected...central through northeast Illinois

    Concerning...Tornado Watch 521...

    Valid 112309Z - 120045Z

    The severe weather threat for Tornado Watch 521 continues.

    SUMMARY...Threat for locally strong to severe gusts and a few brief
    tornadoes will persist from central and northern IL through early

    DISCUSSION...An arcing line storms with embedded bowing segments and
    occasional meso-vortices continues moving northeast through central
    and north central IL at 35-40 kt. The activity is moving through a
    relatively narrow instability corridor with 500-1000 J/kg MLCAPE.
    Despite the somewhat marginal thermodynamic environment, vertical
    wind profiles continue to exhibit large low-level hodographs with
    250-300 m2/s2 storm relative helicity as well as 50+ kt effective
    bulk shear. The downstream environment across northeast IL will
    remain favorable for occasional embedded organized structures
    through early evening. Storms will eventually pose a severe threat
    for the Chicago metro area near or shortly after 00Z.

    ..Dial.. 10/11/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!ozGqI2TSs7E2s7FNdLXkYOISSPxMQa9X96IQuR_pZk4mTH8ulYYcYC123YUh_xaxdPDfXR3-$=
    for graphic product...


    LAT...LON 39348833 40068822 40648830 41218883 41598952 42388905
    42178750 39548763 39348833=20

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