• MESO: Mesoscale Discussion 0600

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, May 31, 2018 23:27:42
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    ACUS11 KWNS 312327
    SWOMCD
    SPC MCD 312327
    MTZ000-010100-

    Mesoscale Discussion 0600
    NWS Storm Prediction Center Norman OK
    0627 PM CDT Thu May 31 2018

    Areas affected...Portions of MT

    Concerning...Severe Thunderstorm Watch 140...

    Valid 312327Z - 010100Z

    The severe weather threat for Severe Thunderstorm Watch 140
    continues.

    SUMMARY...A large hail and damaging wind threat will continue this
    evening across WW 140 generally along and south of a cold front.

    DISCUSSION...The primary short-term severe threat across WW 140 will
    be tied to two supercells across south-central MT. These storms
    formed south of a cold front extending generally east to west across
    much of MT. A modestly unstable and strongly sheared environment
    downstream of this ongoing convection should allow for a continued
    severe hail/wind threat for at least the next few hours. There are
    some indications that isolated convection spreading northeastward
    across far eastern ID and northern WY will encounter the more
    unstable airmass present over south-central and southeastern MT this
    evening. If this occurs, then this area would likely see a
    persistent isolated severe threat. The cold front will continue to
    mark the northern limit of a substantial surface-based thunderstorm
    and resultant hail/wind risk.

    ..Gleason.. 05/31/2018

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

    ATTN...WFO...BYZ...GGW...TFX...

    LAT...LON 45010501 45031221 46711125 47050963 47020652 46830563
    46520499 45010501



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