• MESO: Mesoscale Discussion 1397

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Fri Jul 30 23:31:46 2021
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    ACUS11 KWNS 302331
    SPC MCD 302331=20

    Mesoscale Discussion 1397
    NWS Storm Prediction Center Norman OK
    0631 PM CDT Fri Jul 30 2021

    Areas affected...Nebraska

    Concerning...Tornado Watch 404...

    Valid 302331Z - 310100Z

    The severe weather threat for Tornado Watch 404 continues.

    SUMMARY...Severe threat continues across ww404.

    DISCUSSION...Upper high has settled south into northeast OK early
    this evening. As a result, a fair amount of convection has developed
    around the western periphery of this feature across the higher
    terrain of CO into southeast WY. Over the last few hours, mid-level
    flow has gradually turned more northwesterly across NE and this is
    providing substantial directional turning with height along/just
    north of the surface boundary that remains draped across the
    southern third of the state. Strong surface heating is noted across western/southern NE which is contributing to MLCAPE values near 4000
    J/kg along a corridor from near BBW-FNB. Several slow-moving
    supercells have evolved between BBW-TIF with subsequent movement
    southeast at only 10-15kt. Over the last half hour or so, new
    thunderstorms are developing near the front over Garden County. With
    time, both of these clusters should gradually spread/propagate
    southeast along/just north of the wind shift.

    ..Darrow.. 07/30/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!v2XLpzoHVtigXmRtUUYQtCLhVdaYwO4tnS8_WYVZnj2fJBG17aNaU61xW7cPaKSL8p12YbUz$=
    for graphic product...


    LAT...LON 42920133 42319834 40729834 41330132 42920133=20

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