• MESO: Mesoscale Discussion 0357

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Apr 10 06:53:24 2021
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    ACUS11 KWNS 100653
    SPC MCD 100652=20

    Mesoscale Discussion 0357
    NWS Storm Prediction Center Norman OK
    0152 AM CDT Sat Apr 10 2021

    Areas affected...Southern Mississippi...Southern Alabama...Western
    Florida Panhandle

    Concerning...Tornado Watch 87...

    Valid 100652Z - 100845Z

    The severe weather threat for Tornado Watch 87 continues.

    SUMMARY...A severe threat is expected to develop across southern
    Alabama and the western Florida Panhandle later tonight. Wind
    damage, a few tornadoes and isolated large hail will be possible.
    Weather watch issuance will likely be needed.

    DISCUSSION...The latest radar imagery shows a linear MCS across
    southeastern Mississippi extending into north-central Alabama. The
    line is being supported by a 40 to 50 kt low-level jet. Ahead of
    this line of severe storms, surface dewpoints are in the mid to
    upper 60s F across southwest Alabama and the far western Florida
    Panhandle, where the RAP is analyzing moderate instability. The line
    should be maintained as the low-level jet strengthens, and as the
    storms move eastward along the northern edge of moderate
    instability. Discrete thunderstorms are also expected to move from
    the northern Gulf of Mexico into the coastal areas of Alabama and
    the far western Florida Panhandle over the next couple of hours.=20

    The Mobile, Alabama WSR-88D VWP shows 0-6 km near 65 kt with storm
    relative helicity just above 400 m2/s2. This will be favorable for
    supercells with a tornado threat. Tornadoes will be possible with
    discrete cells that move onshore ahead of the line, and with
    rotating elements with the squall line itself. Widespread wind
    damage will also be possible along the leading edge of the squall
    line. Weather watch issuance will likely be needed to the east of WW
    87 in the next 1 to 2 hours.

    ..Broyles.. 04/10/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!qQZkOFDHc3PbR9TqpT-SbCgHx2LxgyQsMu5mvR_Q3tFM9neX-WIEarofXCEF6hqGLMd2vzLo$=
    for graphic product...


    LAT...LON 31908769 31738847 31498886 30888903 30338906 30128841
    30138763 30188612 30138560 30528532 31258531 31788569
    31918690 31908769=20

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