• MESO: Mesoscale Discussion 0428

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Apr 24 23:13:36 2021
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    ACUS11 KWNS 242313
    SPC MCD 242313=20

    Mesoscale Discussion 0428
    NWS Storm Prediction Center Norman OK
    0613 PM CDT Sat Apr 24 2021

    Areas affected...Northeast Alabama and northwest Georgia

    Concerning...Severe Thunderstorm Watch 110...

    Valid 242313Z - 250115Z

    The severe weather threat for Severe Thunderstorm Watch 110

    SUMMARY...Thunderstorms across northeast Alabama and northwest
    Georgia will continue to pose a risk for severe hail and wind
    through the evening hours.

    DISCUSSION...Discrete and embedded supercells continue to traverse
    eastward across northeast AL in the vicinity of a surface low and
    along a weak trough axis. Several severe hail reports have been
    noted with this activity, and and an environment featuring 1000-1500
    J/kg MLCAPE along with 50-60 knots of effective bulk shear will
    remain supportive of a severe hail threat for the next couple of
    hours. Deep-layer shear vectors oriented along the trough axis may
    favor eventual upscale growth that could limit the hail threat while
    augmenting the potential for damaging winds, though the exact
    evolution is uncertain.=20

    However, the environment remains somewhat spatially limited with
    eastward extent due to cooler air to the north of a weak warm front,
    and a residual cold pool in place across central GA. Modest warm air
    advection in the 925-850 mb layer across northwest GA may allow for
    some eastward expansion of the viable warm sector, but the general
    expectation is for storms to gradually weaken as they move into
    north-central GA later this evening.

    ..Moore.. 04/24/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tYrwyqo2wdCnRAAPAfctVryNlMkrEWpLxpV-ICqiLA_lp2heWbBwoZjzN8rUrxd4HfExN41S$=
    for graphic product...


    LAT...LON 33198699 33978625 34378583 34698526 34858481 34638428
    34428375 34048351 33698345 33348360 33038415 32878484
    32748544 32768603 32838651 32988681 33198699=20

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