• MESO: Mesoscale Discussion 1233

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, August 05, 2018 08:47:21
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    ACUS11 KWNS 050847
    SWOMCD
    SPC MCD 050846
    MNZ000-IAZ000-051015-

    Mesoscale Discussion 1233
    NWS Storm Prediction Center Norman OK
    0346 AM CDT Sun Aug 05 2018

    Areas affected...northwest and north central Iowa through southwest
    and south central Minnesota

    Concerning...Severe Thunderstorm Watch 327...

    Valid 050846Z - 051015Z

    The severe weather threat for Severe Thunderstorm Watch 327
    continues.

    SUMMARY...Threat for damaging wind and large hail will persist next
    couple hours from northwest into north central Iowa through south
    central Minnesota. While storms may remain severe into the western
    part of Minneapolis and Des_Moines county warning areas, expectation
    is for storms to begin a weakening trend by 10Z, so another WW
    downstream from WW 327 will probably not be necessary.

    DISCUSSION...Cluster of storms from southwest MN through northwest
    IA continues southeast with bowing segment over northwest IA moving
    at 45-50 kt. The primary severe threat appears to have transitioned
    to damaging wind through some hail also remains possible. Forward
    propagation along the leading gust front should help to sustain
    storms next couple hours or so through the moderately unstable
    environment. However, model data indicate tendency will be for the
    low-level jet to veer and weaken, and warming due to advection is
    occurring in the 850-700 mb layer. These factors along with
    decreasing MUCAPE downstream from the storms suggest activity will
    probably begin a weakening trend after 10Z.

    ..Dial.. 08/05/2018

    ...Please see www.spc.noaa.gov for graphic product...

    ATTN...WFO...MPX...DMX...FSD...OAX...

    LAT...LON 42649637 43349565 44019484 43759368 43109349 42199426
    42109561 42649637



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