• MESO: Mesoscale Discussion 1039

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, July 11, 2018 20:57:07
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    ACUS11 KWNS 112057
    SWOMCD
    SPC MCD 112056
    MNZ000-NDZ000-112330-

    Mesoscale Discussion 1039
    NWS Storm Prediction Center Norman OK
    0356 PM CDT Wed Jul 11 2018

    Areas affected...Much of northern Minnesota

    Concerning...Severe potential...Watch likely

    Valid 112056Z - 112330Z

    Probability of Watch Issuance...80 percent

    SUMMARY...Storms are expected to initiate around 23-00Z across
    northwest Minnesota and possibly near the North Dakota border, and
    should increase in coverage this evening across northern Minnesota.
    Hail, wind, and perhaps a tornado will be possible. A watch is
    expected later this evening.

    DISCUSSION...Surface analysis shows a cold front extending from
    eastern ND into western SD, with a warm front from northwest MN into
    western WI. South of these boundaries, a very warm and unstable air
    mass continues to develop with dewpoints in the 70s F. Meanwhile,
    gradual height falls with a low-amplitude upper trough will continue
    to approach the region. While CIN currently exists for surface based
    parcels as of 21Z, a few post-frontal showers were already forming
    over ND. With time, strong warm advection will develop in the
    low-levels near the warm front in MN, and scattered storms will
    result. Veering winds with height will favor supercells initially,
    with an eventual merger and/or backbuilding tendency. Large hail,
    damaging wind, and perhaps a tornado or two will be possible.

    ..Jewell/Hart.. 07/11/2018

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

    ATTN...WFO...DLH...FGF...

    LAT...LON 48219681 48609647 48909593 49129525 49179486 49159460
    49069427 48979405 48559335 48029316 47499320 47209350
    46959399 46849474 46689636 46809690 47219702 48219681



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