• MESO: Mesoscale Discussion 1070

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jun 23 23:14:01 2021
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    ACUS11 KWNS 232313
    SPC MCD 232313=20

    Mesoscale Discussion 1070
    NWS Storm Prediction Center Norman OK
    0613 PM CDT Wed Jun 23 2021

    Areas affected...parts of central and eastern Nebraska and into far southeastern South Dakota

    Concerning...Severe Thunderstorm Watch 306...

    Valid 232313Z - 240045Z

    The severe weather threat for Severe Thunderstorm Watch 306

    SUMMARY...Severe risk continues to increase locally over parts of
    north-central Nebraska. As convection shifts eastward -- spreading
    out of the WW in the next 1-2 hours -- a new WW may be needed into
    the northeastern Nebraska area.

    DISCUSSION...Latest radar loop shows hints that storms may begin to
    congeal across north-central Nebraska, as suggested by latest runs
    of the HRRR and which seems reasonable given downstream instability
    that is available. As a south-southwesterly low-level jet develops
    and then veers gradually through the evening, east-southeastward
    propagation of the convection seems likely.

    Presuming continued trends toward upscale growth, damaging wind
    potential will likely become more widespread. Otherwise, large hail
    will remain possible, with baseball-sized hail reported earlier in
    Keya Paha County. As storms near the eastern edge of WW 306,
    downstream watch issuance will likely be needed to encompass this

    ..Goss/Grams.. 06/23/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!q7RRu8tmy19uaYBEshhkPOHIP9SISdZ5wEaPK82RDYW_BGdWEVG-Dyqv2ccqCZ9vppHk49bx$=
    for graphic product...


    LAT...LON 42760076 42930042 43149865 43039712 42799634 41829591
    41279704 41189854 41319996 41950078 42760076=20

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