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  • MESO: Mesoscale Discussion 1333

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Jun 29 12:23:05 2023
    ACUS11 KWNS 291222
    SWOMCD
    SPC MCD 291222=20
    KYZ000-INZ000-ILZ000-291315-

    Mesoscale Discussion 1333
    NWS Storm Prediction Center Norman OK
    0722 AM CDT Thu Jun 29 2023

    Areas affected...Portions of eastern IL into western/southern IN and western/central KY

    Concerning...Severe Thunderstorm Watch 412...

    Valid 291222Z - 291315Z

    The severe weather threat for Severe Thunderstorm Watch 412
    continues.

    SUMMARY...An isolated hail threat continues. Trends are being
    monitored for possible watch issuance into parts of western/southern
    Indiana and western/central KY.

    DISCUSSION...Multiple instances of large hail generally up to golf
    ball size have been reported with supercells across eastern IL into
    western IN over the past 1-2 hours, with one report of 3+ inch hail.
    Some clustering of convection has recently been noted along/near the
    IL/IN border as several supercells are beginning to interact with
    each other. There is concern that a small cluster may evolve from
    these interactions and spread south-southeastward across parts of western/southern IN into western/central KY over the next couple of
    hours. This cluster would probably track along the elevated
    instability gradient, with access to ample buoyancy to support
    surface-based thunderstorms. In addition to the continued threat for
    large hail in the short term, the risk for severe/damaging winds
    should increase when this small cluster develops in tandem with a
    destabilizing boundary layer and steepening low-level lapse rates. A
    new Severe Thunderstorm Watch for parts of IN/KY is being
    considered.

    ..Gleason/Thompson.. 06/29/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!6jovXNWOlpuGIDQxPZL-sikjYFBM7tEj-EATFWJ7U8ELfBitXyeqLODPNM2vXCtiRyWUrIx5Q= qtxSwQaALdWGqkD0ns$ for graphic product...

    ATTN...WFO...LMK...IND...PAH...ILX...

    LAT...LON 39988828 39028670 37238580 37038734 38778785 39988828=20


    =3D =3D =3D
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