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  • MESO: Mesoscale Discussion 1499

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tuesday, September 25, 2018 20:40:10
    This is a multi-part message in MIME format...

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    ACUS11 KWNS 252040
    SWOMCD
    SPC MCD 252039
    ILZ000-WIZ000-IAZ000-MOZ000-252215-

    Mesoscale Discussion 1499
    NWS Storm Prediction Center Norman OK
    0339 PM CDT Tue Sep 25 2018

    Areas affected...Eastern IA...Northern WI...Northern IL

    Concerning...Severe Thunderstorm Watch 388...

    Valid 252039Z - 252215Z

    The severe weather threat for Severe Thunderstorm Watch 388
    continues.

    SUMMARY...Threat for damaging wind gusts and perhaps an isolated
    tornado continues across the northern IL and southeast WI portions
    of Severe Thunderstorm Watch 388.

    DISCUSSION...Well-developed convective line moved across eastern IA
    during the past hour and has recently moved into northwest IL.
    Current storm motion is eastward at about 45 kt. Strong wind gusts
    of 37 kt and 35 kt were measured at MLI and CWI, respectively. These measurements and recent radar signatures from KDVN suggest the
    strongest winds have not transferred to the surface thus far. The
    downstream airmass across north-central and northeast IL appears a
    bit more favorable for momentum transfer given the steeper low-level
    lapse rates and deeper boundary-layer mixing. Tornadoes also remain
    possible, although the veered low-level flow and largely
    unidirectional wind profiles sampled by recent LOT and ILX VAD
    profiles suggest the threat should remain isolated.

    ..Mosier.. 09/25/2018

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

    ATTN...WFO...LOT...ILX...MKX...LSX...DVN...ARX...

    LAT...LON 42579115 43219013 43668830 43268763 41358756 40568927
    40179147 41829158 42579115



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