• MESO: Mesoscale Discussion 0427

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Apr 24 22:56:36 2021
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    ACUS11 KWNS 242256
    SPC MCD 242256=20

    Mesoscale Discussion 0427
    NWS Storm Prediction Center Norman OK
    0556 PM CDT Sat Apr 24 2021

    Areas affected...Parts of southern Alabama and southwestern Georgia

    Concerning...Severe Thunderstorm Watch 108...109...

    Valid 242256Z - 250030Z

    The severe weather threat for Severe Thunderstorm Watch 108, 109

    SUMMARY...Potential still exists for the evolution of another
    upscale growing and organizing cluster of storms which could pose
    increasing risk for damaging wind gusts across parts of southeastern
    Alabama into southwestern Georgia through 7-9 PM EDT.

    DISCUSSION...Lift aided by low-level convergence along a pre-cold
    frontal wind shift advancing across southern Alabama, and warm
    advection along a sharp, quasi-stationary, convectively reinforced
    surface front across southwestern/southern Georgia, is maintaining
    vigorous new thunderstorm development. This appears to be occurring
    in the presence of moderate to large CAPE on the order of 1000-2000+
    J/kg, and strong deep-layer shear beneath 50-70 kt
    west-southwesterly flow around 500 mb. Low-level shear also remains
    rather strong, with 40 kt southwesterly flow around 850 mb roughly
    aligned with the wind shift.

    Given this environment, the surface boundary intersection east of
    Troy, AL into the Albany, GA vicinity might provide a focus for
    consolidating, upscale growing convection during the next few hours.
    If this occurs, the evolution of an organizing convective system
    capable of producing damaging wind gusts could still evolve through
    early evening.

    ..Kerr.. 04/24/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!tc1DGFoJ013BQVDcG18v2dxsUcziwjmBbWIipHR5l21YHWlR7XC0UYIJOOlw26_J9Vdia6fI$=
    for graphic product...


    LAT...LON 31688371 31268323 30878395 31038518 31168585 31188633
    31498650 31738623 32138568 32148523 32018477 31858440

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