• MESO: Mesoscale Discussion 1483

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Aug 11 19:03:04 2021
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    ACUS11 KWNS 111902
    SWOMCD
    SPC MCD 111902=20
    WIZ000-IAZ000-MNZ000-112030-

    Mesoscale Discussion 1483
    NWS Storm Prediction Center Norman OK
    0202 PM CDT Wed Aug 11 2021

    Areas affected...Portions of WI

    Concerning...Tornado Watch 424...

    Valid 111902Z - 112030Z

    The severe weather threat for Tornado Watch 424 continues.

    SUMMARY...The threat for all severe hazards, including tornadoes,
    will continue across much of southern/central WI this afternoon.

    DISCUSSION...Multiple supercells have formed this afternoon across
    WI along and ahead of a cold front. The environment remains very
    favorable for severe supercells, with MLCAPE of 2500-4000 J/kg
    present across this area, along with continued strong deep-layer
    shear owing to the upper trough and related 50-60+ kt mid-level jet
    present over the Upper Midwest. The greatest tornado potential in
    the short term should exist in a narrow southwest to northeast
    corridor across parts of southern/central WI, where around 100-150
    m2/s2 of 0-1 km SRH is present. Indeed, a supercell in Monroe County
    WI has recently acquired strong low-level rotation with a
    corresponding CC minimum. In addition to the tornado threat, both
    large hail and damaging winds will remain a possibility as well.
    This severe wind threat may increase across parts of east-central WI
    over the next couple of hours if storms continue to congeal and grow
    upscale into a cluster.

    ..Gleason.. 08/11/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rPlAJ7gI8F9HkhbC2ELx8X7xqhjmtNvIpDB3pKDAC4LDE5fsSpTYlX4JlFobvvjCf5VKBGiO$=
    for graphic product...

    ATTN...WFO...GRB...MKX...ARX...

    LAT...LON 43629157 43929113 44819009 45168870 44838719 43948764
    43088907 43129108 43629157=20



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