• MESO: Mesoscale Discussion 1640

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tuesday, November 13, 2018 01:26:53
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    ACUS11 KWNS 130026
    SWOMCD
    SPC MCD 130026
    GAZ000-FLZ000-ALZ000-130100-

    Mesoscale Discussion 1640
    NWS Storm Prediction Center Norman OK
    0626 PM CST Mon Nov 12 2018

    Areas affected...Portions of the FL Panhandle...far southeastern
    AL...and southwestern GA

    Concerning...Tornado Watch 427...

    Valid 130026Z - 130100Z

    The severe weather threat for Tornado Watch 427 continues.

    SUMMARY...Severe threat should continue to diminish this evening.
    Additional downstream watch issuance is not expected.

    DISCUSSION...A broken line of thunderstorms will continue eastward
    across southwestern GA and the FL Panhandle this evening. 00Z
    sounding from Tallahassee, FL shows a sharp inversion around 900 mb
    with only weak (less than 500 J/kg) MLCAPE. As the low-level flow
    across this region weakens and veers, convergence along/ahead of a
    surface front should likewise diminish. With the loss of daytime
    heating and the ongoing line of storms becoming increasingly
    oriented parallel to southwesterly mid-level flow, the overall
    severe threat will likely continue to diminish this evening.
    Therefore, downstream watch issuance is not expected, and WW 427
    will be allowed to expire as scheduled at 01Z.

    ..Gleason.. 11/13/2018

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

    ATTN...WFO...FFC...TAE...

    LAT...LON 30218579 31908441 31858399 29988421 29608485 29548514
    29748542 29928548 30048565 30218579



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