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  • MESO: Mesoscale Discussion 1966

    From COD Weather Processor @1:2320/107 to All on Thu Aug 13 12:27:44 2026
    ACUS11 KWNS 131227
    SWOMCD
    SPC MCD 131227
    IAZ000-ILZ000-131430-

    Mesoscale Discussion 1966
    NWS Storm Prediction Center Norman OK
    0727 AM CDT Thu Aug 13 2026

    Areas affected...parts of central/southeastern Iowa and adjacent
    Illinois

    Concerning...Severe Thunderstorm Watch 581...

    Valid 131227Z - 131430Z

    The severe weather threat for Severe Thunderstorm Watch 581
    continues.

    SUMMARY...The cluster of storms has undergone general weakening, but
    could still pose a risk for strong to severe wind gusts along and
    south of the I-80 corridor, east of Des Moines toward the
    Mississippi River, through 9-10 AM CDT.

    DISCUSSION...Coldest cloud tops in infrared satellite imagery and
    peak lightning flash rates have generally been maintained into the
    Des Moines vicinity, but the convective system has become less
    organized looking in radar loops. The primary MCV and westerly rear
    inflow to its southwest have undergone recent weakening. However,
    another notable cyclonic circulation has developed to the
    east-southeast (now to the northeast of Des Moines), within
    continuing stronger thunderstorm development focused near/above the
    leading edge of a developing area of 2-hourly surface pressure rises
    on the order of 2 mb. This may continue pose the most prominent
    risk for a swath of strong to severe surface gusts near the I-80
    corridor east of Des Moines through 14-15Z. It does not appear out
    of the question that another similar circulation could still evolve
    within trailing convection now to the southwest through south of Des
    Moines.

    ..Kerr.. 08/13/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!_bK4-IIQvc-5wzN5l2gwNMzcaRyhByAJP3f5D7r-uAgZSqi4OcIOvybYUcxn4SfneOXWDn7G27GiopMlm7_mk3WpU3w$ for graphic product...

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

    LAT...LON 42189285 42199165 41779088 41429074 40889130 40659186
    40809275 40769373 41139402 41709281 42189285

    MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
    MOST PROBABLE PEAK WIND GUST...55-70 MPH
    MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


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