• MESO: Mesoscale Discussion 1861

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Oct 15 02:46:51 2021
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    ACUS11 KWNS 150246
    SPC MCD 150246=20

    Mesoscale Discussion 1861
    NWS Storm Prediction Center Norman OK
    0946 PM CDT Thu Oct 14 2021

    Areas affected...Much of central Oklahoma

    Concerning...Severe potential...Watch unlikely=20

    Valid 150246Z - 150515Z

    Probability of Watch Issuance...20 percent

    SUMMARY...An area of increasing thunderstorm activity may evolve
    into a small organizing cluster near the Interstate 40 and 44
    corridors, across and east-northeast of the Oklahoma City
    metropolitan area, through Midnight-2 AM CDT.

    DISCUSSION...Ahead of a southward advancing cold front, large-scale
    ascent driven by lower/mid-tropospheric warm advection appears to be
    in the process of strengthening across southwestern into central
    Oklahoma. Latest model output suggests that, as this continues to
    develop east-northeastward through late evening, it may become
    augmented by forcing for ascent associated with a focused area of
    increasingly divergent upper flow, between a pair of coupled,
    cyclonic upper jets across the central and southern Great Plains.

    The primary mid-level short wave impulse, and colder mid-level air,
    may pass to the northwest of the region, and an initially warm,
    subsident layer, based near or below 500 mb, may hinder
    destabilization. However, deepening low-level moisture return,
    above a boundary-layer stabilizing with the loss of daytime heating,
    is expected to become sufficient to support the initiation of an
    upscale growing cluster of thunderstorms near the Oklahoma City
    metropolitan area by 04-06Z.

    Due to the weak mid-level lapse rates, supportive of only weak to
    perhaps modest CAPE (generally on the order of 500-750 J/kg), and
    stable near-surface layer, potential for severe hail and wind seems
    low, but remains uncertain. Much may depend on strengthening of
    low-level flow and the extent of low-level hodograph enlargement in
    the vicinity of the developing cluster. Most model output has
    suggested that this will remain relatively modest, but with perhaps
    a mesoscale area of strengthening that could support substantive
    updraft rotation and storm organization, particularly east-northeast
    of the Oklahoma City overnight.

    ..Kerr/Guyer.. 10/15/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!s2Szg9Wqr1u_Dtz2aZh4fBjJe31C4t-djVS349qXRRuFc_4mud4YSCr-1SIMRo7Ng3GhiBeA$=
    for graphic product...


    LAT...LON 35379873 35949733 36179631 35519561 34979712 34999859

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