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  • MESO: Mesoscale Discussion 0940

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Mon Jun 1 21:38:41 2026
    ACUS11 KWNS 012138
    SWOMCD
    SPC MCD 012138=20
    NEZ000-COZ000-WYZ000-012245-

    Mesoscale Discussion 0940
    NWS Storm Prediction Center Norman OK
    0438 PM CDT Mon Jun 01 2026

    Areas affected...portions of southeast Wyoming into eastern Colorado
    and western Nebraska

    Concerning...Severe Thunderstorm Watch 262...

    Valid 012138Z - 012245Z

    The severe weather threat for Severe Thunderstorm Watch 262
    continues.

    SUMMARY...Supercells will continue across southeastern Wyoming into
    eastern Colorado over the next few hours, accompanied by a severe
    hail threat. A tornado is also possible.

    DISCUSSION...Multiple supercells, with a history of severe hail and
    occasional low-level rotation (especially over CO east of Denver),
    persist amid appreciable low-level upslope flow and 40 kts of
    effective bulk shear, but marginal instability (i.e. 1000 J/kg
    MLCAPE). Given 8+ C/km mid-level lapse rates preceding the ongoing
    storms, severe hail should continue over the next several hours.
    KFTG and TDEN storm relative velocity data have shown low-level
    rotation with storms east of Denver to be relatively brief.
    Nonetheless, ample low-level vertical oriented vorticity exists near
    these storms, so a landspout/hybrid tornado cannot be ruled out if
    an updraft can ingest this vorticity for an appreciable amount of
    time before being undercut by outflow.

    ..Squitieri.. 06/01/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!5D7dXBh_QAalzPfp0ZPQt3iqKRMz22rTBNqV4c22t6hbzsC18X56hwRtXTBfgsQEuE-qFZhrp= ADozLusC8fn7zuLl30$ for graphic product...

    ATTN...WFO...LBF...GLD...PUB...BOU...CYS...

    LAT...LON 39060458 40120498 40670512 41630482 42110446 42670382
    42770315 42440248 41440219 40180216 39530222 39070244
    38920292 38890371 39060458=20

    MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
    MOST PROBABLE PEAK WIND GUST...65-80 MPH
    MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN


    =3D =3D =3D
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