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  • MESO: Mesoscale Discussion 1735

    From COD Weather Processor @1:2320/107 to All on Sat Jul 25 23:26:18 2026
    ACUS11 KWNS 252326
    SWOMCD
    SPC MCD 252325
    SDZ000-260100-

    Mesoscale Discussion 1735
    NWS Storm Prediction Center Norman OK
    0625 PM CDT Sat Jul 25 2026

    Areas affected...North-Central South Dakota

    Concerning...Severe Thunderstorm Watch 513...

    Valid 252325Z - 260100Z

    The severe weather threat for Severe Thunderstorm Watch 513
    continues.

    SUMMARY...Severe wind gusts from 65 to 80 mph and large to very
    large hail are possible for the next few hours across north-central
    South Dakota.

    DISCUSSION...Recent surface analysis places a low over central
    western South Dakota (about 30-40 miles east of RAP), with a subtle
    moisture gradient resulting in low-level moisture convergence to the
    north and northeast of this low. This convergence, aided by weak
    warm-air advection, has resulted in a band of thunderstorms from
    northwest into central South Dakota. The downstream airmass is
    characterized by abundant low-level moisture, very warm
    temperatures, and strong to very strong buoyancy. Moderate westerly
    flow aloft atop low-level southeasterlies results in strong vertical
    shear as well.

    This activity is expected to persist for the next few hours,
    although an outflow boundary from the cluster over south-central
    South Dakota could impact the downstream thermodynamics. A trend
    towards a more easterly motion is anticipated as well, as storms
    grow upscale and become better aligned with the deep shear and
    instability. Severe wind gusts from 65 to 80 mph are the primary
    hazard, although large to very large hail is possible as well,
    particularly if any storm mergers occur.

    ..Mosier.. 07/25/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!7UjdDdPaGOeo1IXACyA3h8Nus8ShpqY3Sj1rzT37anL1mRe-N3Zmq-tjO79iSJBrYojsqzqbQoqO1L0YVbEVW588Aaw$ for graphic product...

    ATTN...WFO...ABR...UNR...

    LAT...LON 44490102 44920166 45460155 45880070 45869885 44699926
    44440009 44490102

    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)