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Storm Prediction Center Mesoscale Discussion 1078

Published Date and Time: 2026-06-10 20:57:00



Mesoscale Discussion 1078
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   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 www.spc.noaa.gov 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 

   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


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