• MESO: Mesoscale Discussion 0852

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, June 24, 2018 07:17:24
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    ACUS11 KWNS 240717
    SWOMCD
    SPC MCD 240716
    NEZ000-KSZ000-COZ000-240815-

    Mesoscale Discussion 0852
    NWS Storm Prediction Center Norman OK
    0216 AM CDT Sun Jun 24 2018

    Areas affected...northeast Colorado...northwest Kansas...and
    southwest Nebraska

    Concerning...Severe potential...Watch possible

    Valid 240716Z - 240815Z

    Probability of Watch Issuance...40 percent

    SUMMARY...Isolated severe thunderstorms with a threat of hail will
    continue through the morning. Trends will be monitored for possible
    watch.

    DISCUSSION...Thunderstorms are developing within northeast Colorado
    in response to increasing warm-air advection stemming from a
    strengthening low-level jet and large-scale ascent associated with a
    short-wave trough across the northern Rockies. Mid-level lapse rates
    on the order of 8-9 C/km, most-unstable CAPE values around 2000
    J/kg, and deep-layer shear on the order of 40-50 knots will continue
    to support a hail threat with any sustained, vigorous updraft.

    Thunderstorm coverage is expected to continue to increase through
    the morning, making it increasingly difficult for thunderstorms to
    remain isolated enough to fully realize the environment's potential.
    Thus, the destructive interference between competing updrafts should
    preclude a more robust large hail threat. As such, trends will
    continue to be monitored for possible watch needs.

    ..Marsh/Guyer.. 06/24/2018

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

    ATTN...WFO...LBF...DDC...GLD...PUB...BOU...CYS...

    LAT...LON 39270404 40140420 41070308 41210152 40820079 38560089
    38520253 39270404



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