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  • MESO: Mesoscale Discussion 1112

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Fri Jun 12 23:20:17 2026
    ACUS11 KWNS 122320
    SWOMCD
    SPC MCD 122319=20
    VAZ000-MDZ000-DCZ000-130045-

    Mesoscale Discussion 1112
    NWS Storm Prediction Center Norman OK
    0619 PM CDT Fri Jun 12 2026

    Areas affected...portions of the Mid-Atlantic...including Washington
    D.C.

    Concerning...Severe Thunderstorm Watch 321...

    Valid 122319Z - 130045Z

    The severe weather threat for Severe Thunderstorm Watch 321
    continues.

    SUMMARY...A gradual decrease in convective intensity and coverage is
    expected through the next 1-2 hours. Some potential for occasional
    damaging wind gusts will continue in the meantime.

    DISCUSSION...Regional radar imagery continues to depicts scattered thunderstorms across Severe Thunderstorm Watch 321, with a downburst
    recently producing a measured 58 kt (67 mph) wind gust at Dulles
    airport. Downstream surface observations across southeastern
    Virginia indicate surface temperatures are beginning to cool, with a dissipation of boundary layer cumulus also noted on visible
    satellite. As nocturnal cooling/stabilization continues, a gradual
    decrease in convective coverage and intensity is expected over the
    next 1-2 hours. Some potential for occasional damaging wind gusts
    will persist in the near-term, however, with the greatest potential
    likely to accompany any stronger downbursts. A local watch extension
    may be needed, particularly in southeastern Virginia, should a
    stronger storm or two persist after 01z, but a new Severe
    Thunderstorm Watch is not anticipated.

    ..Chalmers.. 06/12/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!42aMap6_sBWLoHFgoGImDLnHDuFGHuwcVTb8r6bHCx9JODh4z0-GOsHmdGfvrxFXsmDZzTjsh= yj7bMeTOPaUEtWaTZo$ for graphic product...

    ATTN...WFO...AKQ...LWX...RNK...

    LAT...LON 39097751 39107734 39057713 38977694 38847685 38057647
    37827637 37657636 37507649 37437665 37247718 37077803
    37017864 37077920 37147947 37467943 37777916 38337849
    38507824 38987766 39097751=20

    MOST PROBABLE PEAK WIND GUST...55-70 MPH


    =3D =3D =3D
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