• MESO: Mesoscale Discussion 0460

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Apr 29 00:26:04 2021
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    ACUS11 KWNS 290025
    SWOMCD
    SPC MCD 290025=20
    KYZ000-TNZ000-290130-

    Mesoscale Discussion 0460
    NWS Storm Prediction Center Norman OK
    0725 PM CDT Wed Apr 28 2021

    Areas affected...Western Kentucky and far Northwestern Tennessee

    Concerning...Severe Thunderstorm Watch 118...

    Valid 290025Z - 290130Z

    The severe weather threat for Severe Thunderstorm Watch 118
    continues.

    SUMMARY...The severe threat has begun to diminish across most of WW
    118, but an isolated cell across northwest Tennessee will continue
    to support a severe threat through at least 01 UTC.

    DISCUSSION...Recent satellite and radar trends have shown a gradual
    weakening of the convective line within WW 118 across western KY
    over the past 1-2 hours. The main severe threat has now become
    primarily limited to a discrete supercell that has emerged on the
    southern flank of the line and along the weak surface baroclinic
    zone in northwest TN. This cell has exhibited signs of low-level
    rotation, and recent observations from the KHPX VWP show 150 m2/s2
    0-1 km SRH remains in place ahead of the storm. Because of this, a
    severe hail/wind risk will persist at least through 01 UTC before
    diurnal cooling begins to increase inhibition. Additionally, a brief
    tornado will remain possible in the near-term given the
    environmental low-level shear. To the north of this supercell, a
    weak MCV has had occasional updraft pulses, but these have largely
    been transient and have posed minimal severe risk. While an instance
    of damaging wind remains possible, the severe potential will
    continue to decrease as this feature moves into a more stable air
    mass.

    ..Moore.. 04/29/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!sCEOqSUkfwfVJDWVDGiOOFhOuF_p2kv2qNP80LTn7BR6h63jQ-gLtOCl6Zs8NX6V6WL_gu1f$=
    for graphic product...

    ATTN...WFO...OHX...PAH...MEG...

    LAT...LON 36428874 36718855 37148831 37338780 37248736 36998718
    36678722 36438747 36248774 36198816 36258853 36428874=20



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