1. Forum
  2. FidoNet
  3. WEATHER

  • MESO: Mesoscale Discussion 0927

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Mon Jun 1 02:16:00 2026
    ACUS11 KWNS 010215
    SWOMCD
    SPC MCD 010215=20
    IAZ000-NEZ000-SDZ000-010415-

    Mesoscale Discussion 0927
    NWS Storm Prediction Center Norman OK
    0915 PM CDT Sun May 31 2026

    Areas affected...Far southeast South Dakota into adjacent portions
    of Nebraska and Iowa

    Concerning...Severe Thunderstorm Watch 257...

    Valid 010215Z - 010415Z

    The severe weather threat for Severe Thunderstorm Watch 257
    continues.

    SUMMARY...A localized corridor of higher tornado potential may
    persist for the next couple of hours across far southeast South
    Dakota into adjacent portions of Iowa and Nebraska.

    DISCUSSION...Additional tornadic supercells have emerged immediately
    west of the Sioux Falls, SD and the I-29 corridor based on radar
    imagery from KFSD. Near-storm 0-1 km SRH sampled by the local VWP
    has recently increased to around 200 m2/s2 immediately ahead of the
    approaching storms. Consequently, the near-storm environment is more
    favorable for tornadoes than previously anticipated, though storm
    interactions appear to be modulating the duration of the tornado
    threat to some degree. Additional supercell development is noted on
    the southern flank of the emerging cluster, and is already showing
    signs of an organizing low-level mesocyclone. It appears likely that
    some tornado threat will likely continue for the next 1-2 hours -
    most likely on the southern flank of the cluster as it migrates
    east/southeast into far northeast NE/northwest IA. Based on the
    near-storm environment and observed velocity signatures, a strong
    tornado appears possible.

    ..Moore.. 06/01/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!6pmHSF89ptEv1y1gCwomXdOYpeqFhMn0yt7JDTGxeQKce2_bs73tSBzG9LlD1nxO-XYZlKIQK= ehqDcZDusQAK6h888s$ for graphic product...

    ATTN...WFO...FSD...OAX...

    LAT...LON 42589728 43109709 43329697 43359662 43289611 43139602
    42919595 42689607 42519629 42459661 42489704 42589728=20

    MOST PROBABLE PEAK TORNADO INTENSITY...100-125 MPH
    MOST PROBABLE PEAK WIND GUST...55-70 MPH
    MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


    =3D =3D =3D
    To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM.

    --- SBBSecho 3.28-Linux
    * Origin: Capitol City Online (1:2320/107)