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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