• MESO: Mesoscale Discussion 1667

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Sep 1 08:01:55 2021
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    ACUS11 KWNS 010801
    SWOMCD
    SPC MCD 010801=20
    NJZ000-PAZ000-DEZ000-MDZ000-DCZ000-011000-

    Mesoscale Discussion 1667
    NWS Storm Prediction Center Norman OK
    0301 AM CDT Wed Sep 01 2021

    Areas affected...Maryland...Southeast Pennsylvania

    Concerning...Tornado Watch 481...

    Valid 010801Z - 011000Z

    The severe weather threat for Tornado Watch 481 continues.

    SUMMARY...An isolated tornado threat will likely continue for a few
    more hours. The threat is expected to become marginal near daybreak.
    For that reason, a new weather watch will probably not be needed.

    DISCUSSION...The latest radar imagery shows an isolated supercell in
    central and northern Washington D.C. The storm is located along as
    surface front and on the northwestern edge of a corridor of moderate instability, with the RAP estimating MLCAPE in the 1000 to 1200 J/kg
    range. In addition, the LWX WSR-88D VWP has veering winds with
    height in the boundary layer and some speed shear in the low to
    mid-levels. This wind profile will support continued supercell
    development over the next 2 to 3 hours. A tornado threat will be
    possible as the ongoing supercell moves northeastward toward the
    Pennsylvania state line. The supercell is expected to weaken around
    daybreak as it moves away from the stronger instability and more to
    the cool side of the surface front.

    ..Broyles.. 09/01/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rv2VDTWfB89m1cF_Dr-RIIaa8fSODQrh23q5qNl3vjKhWLmlbVQJ1OZJOR9OmHhxS63cJ6tH$=
    for graphic product...

    ATTN...WFO...PHI...CTP...LWX...

    LAT...LON 39657697 39177730 38977706 38907658 39047600 39527550
    39997517 40177531 40287613 40047663 39657697=20



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