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  • MESO: Mesoscale Discussion 1340

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Fri Jun 26 22:41:28 2026
    ACUS11 KWNS 262241
    SWOMCD
    SPC MCD 262241=20
    MEZ000-MAZ000-NHZ000-270015-

    Mesoscale Discussion 1340
    NWS Storm Prediction Center Norman OK
    0541 PM CDT Fri Jun 26 2026

    Areas affected...portions of northeastern Massachusetts and
    southeastern New Hampshire

    Concerning...Severe Thunderstorm Watch 397...

    Valid 262241Z - 270015Z

    The severe weather threat for Severe Thunderstorm Watch 397
    continues.

    SUMMARY...The threat for isolated large hail and damaging wind gusts
    continues across portions of Severe Thunderstorm Watch 397. This
    threat should gradually diminish this evening with the loss of
    diurnal heating and as storms progress offshore.

    DISCUSSION...Isolated convection, including one persistent
    supercell, has continued to progress southeastward across portions
    of New England and along a diffuse warm front over the past 1-2
    hours, with several reports of damaging wind gusts and large hail up
    to golf ball size noted. While the severe threat is expected to
    gradually diminish with time with the loss of diurnal heating and as
    storms progress offshore, isolated large hail (with perhaps another
    instance of large hail up to 1.5-1.75" in diameter) and damaging
    wind gusts remain possible in the meantime owing to 500 to locally
    1000 J/kg MLCAPE, strong effective shear of 50+ kts, and elongated
    hodographs.

    ..Chalmers.. 06/26/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!5qgznyIByYcmHhy4IFZe0IorE4rPCaa0gs9O_zNZlQkupULOdzsIEHR4rLcNov0V9MuoqdRkA= o7gO00k3K2NFHnT5oI$ for graphic product...

    ATTN...WFO...GYX...BOX...

    LAT...LON 43387160 43287113 43197071 43097044 42857039 42607057
    42517089 42687160 42847203 42987207 43257195 43387160=20

    MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
    MOST PROBABLE PEAK WIND GUST...55-70 MPH
    MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


    =3D =3D =3D
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