• MESO: Mesoscale Discussion 1135

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jun 30 20:16:52 2021
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    ACUS11 KWNS 302016
    SPC MCD 302016=20

    Mesoscale Discussion 1135
    NWS Storm Prediction Center Norman OK
    0316 PM CDT Wed Jun 30 2021

    Areas affected...Portions of southern NH and coastal ME

    Concerning...Severe Thunderstorm Watch 326...

    Valid 302016Z - 302145Z

    The severe weather threat for Severe Thunderstorm Watch 326

    SUMMARY...The greatest near-term severe threat across Severe
    Thunderstorm Watch 326 should remain across parts of southern New
    Hampshire and coastal Maine this afternoon.

    DISCUSSION...A narrow corridor of moderate instability (MLCAPE of
    1500 J/kg) remains present generally ahead of ongoing storms across
    parts of southern NH and coastal ME. Recent VWP from KGYX shows
    strong flow remains present in the 4-8 km layer AGL, with around
    40-50 kt of westerly winds estimated. Convection has shown signs of
    continued organization with around 40 kt of effective bulk shear,
    and a mix of marginal supercells and multicells has been observed
    over the past couple of hours. Occasional severe hail and strong to
    locally damaging winds are expected to to remain the primary severe
    threat as storms continue to move eastward towards the coast. The
    greatest damaging wind threat may focus with a small cluster of
    storms moving eastward across southern NH and vicinity, as low-level
    lapse rates are steepest there.

    ..Gleason.. 06/30/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!o-iZWLhKdQkGeGjQ1PBKuU9IycvtljVJemiyCGOPlWULa9a6dnjX1iWbRmfMgHYC3QQb3A6m$=
    for graphic product...


    LAT...LON 42787248 43217233 43657167 44557001 44916908 45246733
    45056695 44786694 44486749 44076890 43537021 42937076
    42857114 42747150 42787248=20

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