• MESO: Mesoscale Discussion 1656

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Aug 31 04:36:06 2021
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    ACUS11 KWNS 310435
    SPC MCD 310435=20

    Mesoscale Discussion 1656
    NWS Storm Prediction Center Norman OK
    1135 PM CDT Mon Aug 30 2021

    Areas affected...portions of eastern NE and extreme western IA

    Concerning...Severe Thunderstorm Watch 479...

    Valid 310435Z - 310600Z

    The severe weather threat for Severe Thunderstorm Watch 479

    SUMMARY...A threat of large hail and gusty winds continues across WW
    479. Local watch extension may be needed for a small portions of
    eastern Nebraska.

    DISCUSSION...A couple of intense supercells, potentially producing
    very large hail, are ongoing in the vicinity of Pierce and Stanton
    counties in northeast NE near a stationary surface boundary draped
    across eastern NE. The 00z RAOB from OAX indicated very steep
    midlevel lapse rates amid strong instability. This will help
    maintain well-organized cells amid 35-40 kt 0-6 km shear, and an
    increasing southerly low-level jet (per latest OAX VWP data). While
    these supercells are moving rather slow at around 15-20 kt, a local
    aerial extension of the watch may be needed for portions of eastern
    NE in the Omaha CWA given potential for a continued hail threat just
    downstream from WW 479.

    ..Leitman.. 08/31/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!uV3LRjbe5v2Ab2Vp8KOfEOZZRlsJiv8G_W6GlTAOU_6uZlOOJi_ggmCnd4VWg5ZvI10xIPyt$=
    for graphic product...


    LAT...LON 42479739 42399673 42169613 41509552 41039565 40879600
    40819663 41059731 41459773 41879790 42209773 42479739=20

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