• MESO: Mesoscale Discussion 1681

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Sep 2 07:39:42 2021
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    ACUS11 KWNS 020739
    SWOMCD
    SPC MCD 020738=20
    MAZ000-RIZ000-020915-

    Mesoscale Discussion 1681
    NWS Storm Prediction Center Norman OK
    0238 AM CDT Thu Sep 02 2021

    Areas affected...Southeast New England coast

    Concerning...Tornado Watch 486...

    Valid 020738Z - 020915Z

    The severe weather threat for Tornado Watch 486 continues.

    SUMMARY...The threat for a tornado and isolated damaging gusts will
    persist along the southeast New England coast until the remnants of
    Ida move offshore by about 11z.

    DISCUSSION...Earlier supercells moved into southeast MA and became
    elevated north of the surface warm front. This boundary has moved a
    little northward in the past hour, with Martha's Vineyard and
    Nantucket both in the surface warm sector as of 07z. Some slight
    additional northward movement of the warm front is possible into
    extreme southeast MA as the increasingly baroclinic remnants of Ida
    move east-northeastward along the baroclinic zone aligned along the
    southern New England coast. Vertical shear remains favorable for
    supercells with large hodographs and effective SRH at or above 300
    m2/s2. Where surface temperatures can warm into the low-mid 70s
    with low 70s dewpoints, there will be sufficient surface-based
    buoyancy to maintain the threat for a tornado or two and damaging
    gusts. These threats will persist within the the primary convective
    band until it moves across the southeast MA coast by about 11z.

    ..Thompson.. 09/02/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tK_YDreNw9xks5TH8JZRoxAWYWkTYhze7zHREpsUtqqk4mc26MooSqQH3QmxOuw-0YI45kw4$=
    for graphic product...

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

    LAT...LON 41256965 41037064 41157149 41507143 41727078 41827015
    41866978 41726962 41256965=20



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