• MESO: Mesoscale Discussion 1082

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, July 19, 2018 14:59:13
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    ACUS11 KWNS 191459
    SWOMCD
    SPC MCD 191458
    MOZ000-KSZ000-191700-

    Mesoscale Discussion 1082
    NWS Storm Prediction Center Norman OK
    0958 AM CDT Thu Jul 19 2018

    Areas affected...Portions of Missouri

    Concerning...Severe potential...Watch possible

    Valid 191458Z - 191700Z

    Probability of Watch Issuance...40 percent

    SUMMARY...Clusters of thunderstorms may pose a risk of isolated
    severe gusts and large hail this morning. Through early afternoon,
    this threat may further increase, possibly warranting watch
    issuance.

    DISCUSSION...Regional radar and satellite data depict two distinct
    clusters of thunderstorm activity this morning over northern
    Missouri. Both appear to be aided by large-scale ascent along the
    southern fringe of a 500mb vorticity max near the mid Missouri
    Valley. Additionally, KEAX VWP data illustrate veering flow with
    height from the surface through approximately 3-4 km AGL, suggesting
    modest warm advection is also assisting convective growth.

    Low-level stratus across parts of the state is slowing
    destabilization this morning, with current surface temperatures in
    the 70s to lower 80s. In turn, a rapid increase in severe potential
    is not currently anticipated. However, with further dissipation of
    these clouds and enhanced insolation, an increasingly unstable
    boundary layer should combine with steep mid-level lapse rates to
    promote fairly robust MLCAPE by afternoon across western/southern
    Missouri. If storm propagation can maintain some western component
    into this buoyancy corridor through the afternoon, a greater severe
    threat may be realized, with a mixture of supercells and bowing
    clusters possible, given considerable mid/upper northwesterlies.
    These cells would likely be capable of large hail, damaging winds,
    and perhaps a tornado.

    While this potential (and related watch issuance) does not appear
    imminent, it may materialize by early/mid afternoon. Regardless, if
    trends warrant, a watch could be issued sooner.

    ..Picca/Guyer.. 07/19/2018

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

    ATTN...WFO...LSX...SGF...EAX...

    LAT...LON 37219402 36879315 36869210 36919162 37389158 38779176
    39759227 39909278 40249378 40399427 40319473 40069485
    38329447 37539430 37219402



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