• MESO: Mesoscale Discussion 1321

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Jul 20 23:12:46 2021
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    ACUS11 KWNS 202312
    SPC MCD 202312=20

    Mesoscale Discussion 1321
    NWS Storm Prediction Center Norman OK
    0612 PM CDT Tue Jul 20 2021

    Areas affected...New York and New England

    Concerning...Severe Thunderstorm Watch 384...

    Valid 202312Z - 210115Z

    The severe weather threat for Severe Thunderstorm Watch 384

    SUMMARY...The wind-damage threat inside WW 384 is expected to
    continue for several more hours this evening. As the convection
    moves to the eastern edge of WW 384, a new watch may be needed.

    DISCUSSION...The latest radar imagery from Albany, New York shows
    two small clusters of strong to severe thunderstorms. The first is
    located to the east of Lake Ontario with the second in northern New
    York near the Vermont state line. These convective clusters are
    located in a moist airmass with surface dewpoints in the 60s F. This
    is contributing to moderate instability with the RAP estimating
    MLCAPE in the 1500 to 2000 J/kg range. In addition, moderate
    deep-layer shear is present with 0-6 km shear near 35 kt on the
    Albany WSR-88D VWP. Th instability, shear combined with steep
    low-level lapse rates will support isolated wind damage with the
    stronger multicells. The easternmost cluster of strong storms will
    likely move into New Hampshire and southern Maine over the next
    couple of hours, where instability is weaker but still could support
    strong to severe gusts.

    ..Broyles/Edwards.. 07/20/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vjiiESAf2ysRFrl8Bs3Rszbr8WzYCDqhGwZ78TNB3AE-Bo8J_Rn7LcLY8zPTkwz9xs7bM_ZY$=
    for graphic product...


    LAT...LON 44767209 44507120 43807103 42977126 42377200 42297385
    42347585 42807675 43257670 43787570 44727371 44767209=20

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