• MESO: Mesoscale Discussion 1842

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Oct 13 00:31:08 2021
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    ACUS11 KWNS 130031
    SPC MCD 130030=20

    Mesoscale Discussion 1842
    NWS Storm Prediction Center Norman OK
    0730 PM CDT Tue Oct 12 2021

    Areas affected...Eastern Texas Panhandle and Western Oklahoma

    Concerning...Tornado Watch 523...

    Valid 130030Z - 130230Z

    The severe weather threat for Tornado Watch 523 continues.

    SUMMARY...The severe weather threat continues across WW 523. The
    greatest near-term threat will remain across western OK associated
    with isolated supercells, but a second round of storms remains
    likely later this evening.

    DISCUSSION...Latest regional radar imagery shows a few supercells
    moving north/northeastward across far north Texas and western
    Oklahoma. The west-central OK supercell has exhibited strong
    low-level rotation, indicating that the ample low-level shear over
    the region (200-300 m2/s2 0-1 km SRH sampled by the KFDR VWP and
    analyzed in recent RAP mesoanalysis) is compensating for lingering
    mixed-layer inhibition. The tornado threat associated with this
    storm will continue for the near term, and may persist into the late
    evening hours as low-level wind fields strengthen in response to the
    deepening surface low to the north.=20

    Additional discrete cells are possible across southwest OK and/or
    the eastern TX Panhandle along the warm front within the next 1-2
    hours, but weak forcing for ascent, substantial mid-level dry air
    entrainment, and the onset of diurnal cooling make confidence in
    discrete storm coverage uncertain. Latest hi-res guidance has
    depicted this potential, but run-to-run consistency has been
    somewhat poor, further reducing confidence.=20

    Additional storms are likely later this evening/overnight as
    stronger lift associated with the approach of the main upper-level
    wave (manifesting as increasing showers and weak convection over the
    southern High Plains) overspreads the region. Increasingly
    meridional flow along the initiating cold front will support mostly
    linear storm modes, but increasing low-level shear within the warm
    sector should maintain a QLCS tornado threat over the watch area.

    ..Moore.. 10/13/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!pYW1IM1PY3V25ledMprVSgr8BGZve9kTE-Xt-wP654WC1aPMNTOjNEkTEXu8FvoTnwE6CgyY$=
    for graphic product...


    LAT...LON 34500004 34920063 35460117 36180145 36790146 37010086
    36829988 36679951 36149884 35329834 34639813 34259816
    34069842 34029859 34039936 34500004=20

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