• MESO: Mesoscale Discussion 0913

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, June 28, 2018 08:52:41
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    ACUS11 KWNS 280852
    SWOMCD
    SPC MCD 280852
    NDZ000-281015-

    Mesoscale Discussion 0913
    NWS Storm Prediction Center Norman OK
    0352 AM CDT Thu Jun 28 2018

    Areas affected...southern North Dakota

    Concerning...Severe potential...Watch unlikely

    Valid 280852Z - 281015Z

    Probability of Watch Issuance...20 percent

    SUMMARY...Isolated large hail will be possible with the strongest thunderstorms. A watch is not expected given the isolated nature of
    the threat.

    DISCUSSION...Isolated thunderstorms are developing within a warm-air
    advection regime atop a remnant frontal boundary across southern
    North Dakota. These thunderstorms should continue to move east with
    time owing to deep westerly flow through the cloud bearing layer.
    Deep-layer shear values are on the order of 50 knots and a parcel
    source region characterized by most-unstable CAPE values in excess
    of 1000 J/kg will support updraft organization and longevity --
    including elevated transient supercell-like structures. Despite
    mid-level lapse rates across on the order of 5-6 C/km, the degree of instability suggests that isolated large hail will be possible with
    the strongest thunderstorm cores.

    A watch is currently not anticipated given the relative isolated
    nature of the threat.

    ..Marsh/Guyer.. 06/28/2018

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

    ATTN...WFO...FGF...BIS...

    LAT...LON 46740246 47630134 47419692 46059703 46100145 46740246



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