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  • MESO: Mesoscale Discussion 1078

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Thu Jun 11 00:56:31 2026
    ACUS11 KWNS 110056
    SWOMCD
    SPC MCD 110055=20
    INZ000-ILZ000-110230-

    Mesoscale Discussion 1078
    NWS Storm Prediction Center Norman OK
    0755 PM CDT Wed Jun 10 2026

    Areas affected...portions of northern Illinois and northwest Indiana

    Concerning...Tornado Watch 308...

    Valid 110055Z - 110230Z

    The severe weather threat for Tornado Watch 308 continues.

    SUMMARY...Severe/damaging gusts and a couple of QLCS tornadoes
    remain possible with a well-developed line of storms across northern
    IL. Conditions are being monitored for a downstream Severe
    Thunderstorm Watch.

    DISCUSSION...Across Tornado Watch 308, a severe squall line extended
    from northern IL southwestward toward the MS River. The northern
    most section of the line remains severe despite limited buoyancy
    from earlier convection. This section should approach the Chicago
    metro in the next hour with a risk for isolated damaging gusts and a
    brief QLCS tornado or two.

    Farther southwest, the environment is more unstable and this section
    of the line has started to show internal surges that could result in
    another bowing segment. Shear remains robust and a 40+ kt low-level
    jet should bolster the southern portions of the line this evening.
    The threat for severe gusts and QLCS tornado or two will continue
    across the Tornado Watch area in portions of central IL, and may
    extend into portions of northwestern IN tonight. A downstream Severe Thunderstorm Watch is being considered for northeastern IL into
    northwest IN.

    ..Lyons/Smith.. 06/11/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!62KE_q6zlAtazEHdLoWWhA2rMUDM1RyQEHxF6ZFX-pKyoLlrNqg03z7YrjB-tvVVNRBxwXDGU= _lzz9o8G62_5NgkUOM$ for graphic product...

    ATTN...WFO...IWX...IND...LOT...ILX...DVN...

    LAT...LON 41768756 41668708 41658681 41318652 40958657 40768664
    40438707 40288892 40209017 40319042 40539037 40769016
    41098956 41318912 41578903 41768899 42028892 42158896
    42188841 42158778 41768756=20

    MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
    MOST PROBABLE PEAK WIND GUST...65-80 MPH
    MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


    =3D =3D =3D
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