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  • MESO: Mesoscale Discussion 1680

    From COD Weather Processor @1:2320/107 to All on Mon Jul 20 23:36:46 2026
    ACUS11 KWNS 202336
    SWOMCD
    SPC MCD 202335
    IAZ000-210100-

    Mesoscale Discussion 1680
    NWS Storm Prediction Center Norman OK
    0635 PM CDT Mon Jul 20 2026

    Areas affected...central Iowa

    Concerning...Tornado Watch 500...

    Valid 202335Z - 210100Z

    The severe weather threat for Tornado Watch 500 continues.

    SUMMARY...A focused corridor of damaging wind potential may be
    evolving near or just east of the Des Moines vicinity through 01Z.
    Large to very large hail is also possible.

    DISCUSSION...Latest trends in volumetric radar data indicate
    multiple supercells near Ames with some signal that a
    larger-than-RFD-scale cold pool may be evolving. An outflow boundary
    precedes those storms with that feature moving southwest at around
    10 kt. Current thinking is that continued storm mergers may support
    the evolution of another bow echo configuration, which would track
    to the south-southeast along the immediate cool side of the leading
    outflow boundary, near or just to the east of the Des Moines metro
    area. Should that scenario unfold, corridor of strong winds with
    gusts of 65-75 mph are possible. To the immediate west/northwest,
    additional supercell structures may continue to backbuild, near the intersection of the east-west front and north-south outflow
    boundary. Large to very large hail will remain possible in that
    regime, as well as the potential for a tornado or two.

    ..Mead.. 07/20/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!7k2iKxszqJtL5CL8BlttU6uUIJ_a5Ma-9BHdUxZ-Q_KwsR6imWJ0GO9zsoGkYCRCAfdE13VUbM6S2fW8Ek2MwE_f8Bw$ for graphic product...

    ATTN...WFO...DVN...DMX...

    LAT...LON 41369318 41769365 42159386 42299323 41539249 41229236
    41149263 41129287 41369318

    MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
    MOST PROBABLE PEAK WIND GUST...65-80 MPH
    MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN


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    --- scorpsmtpd
    * Origin: capitolcityonline.net * KY, USA (1:2320/107)