• MESO: Mesoscale Discussion 1675

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, December 01, 2018 06:21:34
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    ACUS11 KWNS 010521
    SWOMCD
    SPC MCD 010520
    ARZ000-MOZ000-LAZ000-TXZ000-OKZ000-KSZ000-010645-

    Mesoscale Discussion 1675
    NWS Storm Prediction Center Norman OK
    1120 PM CST Fri Nov 30 2018

    Areas affected...Southeast KS...Southern MO...Eastern OK...Most of AR...Northeast TX

    Concerning...Tornado Watch 429...430...431...

    Valid 010520Z - 010645Z

    The severe weather threat for Tornado Watch 429, 430, 431 continues.

    SUMMARY...Threat for damaging wind gusts and a tornado or two
    continues along the convective line extending from southeast KS into
    central TX.

    DISCUSSION...A coherent QLCS extends from southeast KS southward
    through eastern OK and into central TX. Portion of the line in KS
    and OK is tied to the forcing for ascent associated with the
    ejecting mid/upper trough. Strongly forced nature of this convection
    has allowed it to persist and organize within the strongly sheared
    but only moderately unstable environment. Threat for all severe
    hazards remains in this region but the primary threat appears to be transitioning to damaging wind gusts. Embedded vortices are possible
    as the convective line undergoes localized bowing. Increasing
    low-level stability north of the warm front (currently analyzed from
    far southeast KS to the MO boot hill) will contribute to a gradually diminishing threat with northward extent.

    Farther south, forcing for ascent is a bit weaker but the
    thermodynamic environment is more favorable, leading to a
    continuation of the convective line all the way into central TX. The
    best overlap between forcing for ascent, favorable thermodynamics,
    and strong kinematics is northeast TX. This area appears to have the
    best chance for a tornado. The approaching convective line results
    in a less favorable storm mode, but the strength of the low-level
    shear supports QLCS tornado potential.

    ..Mosier.. 12/01/2018

    ...Please see www.spc.noaa.gov for graphic product...

    ATTN...WFO...LZK...SGF...SHV...TSA...ICT...FWD...OUN...

    LAT...LON 36249540 37829577 37959339 35559170 33179223 32399517
    32499655 33369624 34619531 36249540



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