• MESO: Mesoscale Discussion 1104

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, July 20, 2018 20:00:20
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    ACUS11 KWNS 202000
    SWOMCD
    SPC MCD 201959
    OHZ000-INZ000-202100-

    Mesoscale Discussion 1104
    NWS Storm Prediction Center Norman OK
    0259 PM CDT Fri Jul 20 2018

    Areas affected...Portions of far eastern Indiana and far western
    Ohio

    Concerning...Tornado Watch 289...290...

    Valid 201959Z - 202100Z

    The severe weather threat for Tornado Watch 289, 290 continues.

    SUMMARY...Threat for a few damaging gusts and a brief tornado or two
    may progress into far western Ohio. However, cells should weaken
    with eastward extent and new downstream watch issuance is not
    currently expected.

    DISCUSSION...A line of storms, composed of bowing segments and
    embedded supercells, is moving east around 35-45 mph this afternoon.
    Backed flow and enhanced storm-relative helicity ahead of the line
    may maintain some threat for localized damaging winds and a couple
    brief tornadoes into far western Ohio. However, this line will
    encounter increasingly stable low-level air behind earlier
    convection, which should gradually reduce the severe threat.
    Therefore, downstream watch issuance is not currently anticipated.
    Local extension of ongoing Watches 289 and 290 could be needed
    across far western counties of Ohio, though.

    ..Picca.. 07/20/2018

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

    ATTN...WFO...ILN...IWX...IND...

    LAT...LON 40298549 41378519 41478466 41418447 41078422 40558423
    40038440 39938480 39958542 39998551 40298549



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