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  • MESO: Mesoscale Discussion 1731

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, December 27, 2018 06:41:09
    This is a multi-part message in MIME format...

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    ACUS11 KWNS 270541
    SWOMCD
    SPC MCD 270540
    LAZ000-TXZ000-ARZ000-270745-

    Mesoscale Discussion 1731
    NWS Storm Prediction Center Norman OK
    1140 PM CST Wed Dec 26 2018

    Areas affected...Northwest Louisiana...South-central/Southeast/East
    Texas

    Concerning...Tornado Watch 444...445...

    Valid 270540Z - 270745Z

    The severe weather threat for Tornado Watch 444, 445 continues.

    SUMMARY...An isolated wind damage/tornado threat will continue for a
    few more hours from northwest Louisiana southwestward onto the
    middle and upper Texas Coastal Plain.

    DISCUSSION...Latest radar data shows a continuous line of strong
    thunderstorms located from northeast Texas southwestward into the
    southern Texas Hill Country. Moderate instability is located ahead
    of much of the squall-line which will help to keep a severe threat
    going for a few more hours. An isolated wind damage threat will
    exist with the more intense bowing segments within the line. In
    addition, the RAP is showing a 55 to 65 kt low-level jet ahead of
    the line which is creating strong low-level shear profiles. WSR-88D
    VWPs at Shreveport, LA and Houston, TX have strong speed shear in
    the lowest 1 KM AGL with looped hodographs above that. This
    low-level shear environment will be favorable for an isolated
    tornado threat with rotating cells that develop within the line.

    ..Broyles/Guyer.. 12/27/2018

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

    ATTN...WFO...LCH...SHV...HGX...FWD...CRP...EWX...

    LAT...LON 32889490 32069546 31279636 30339755 29559874 29199904
    28719890 28349804 28969660 30009511 31869351 32839357
    33149427 32889490



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