Mesoscale Discussion 0347 NWS Storm Prediction Center Norman OK 0724 PM CDT Fri Apr 03 2026 Areas affected...Central portions of Illinois into central and northwest Indiana Concerning...Tornado Watch 94... Valid 040024Z - 040200Z The severe weather threat for Tornado Watch 94 continues. SUMMARY...All severe hazards may accompany ongoing storms along a warm front over central IL. DISCUSSION...Supercells have matured across central IL over the past couple of hours, with multiple instances of severe hail and at least one brief tornado reported. These storms are progressing eastward along a warm front, where SRH is locally maximized. The 00Z ILX observed sounding depicts an uncapped warm sector, characterized by modest tropospheric lapse rates atop upper 60s F dewpoints, yielding tall and relatively thin MLCAPE (just under 1000 J/kg). This sounding also shows modest low-level curvature, but little upper-level elongation. As such, it has been difficult to yield sustained low-level mesocyclones with greater tornado potential, and it is unclear if this scenario will amplify. Nonetheless, despite gradual boundary layer stabilization this evening, an increase in the low-level jet this evening may result in persistent supercell structures for at least a few more hours. The best chance for short-term severe (any hazard) will be across central IL, given the presence of ongoing supercells. The severe threat appears to have diminished for the time being from Iroquois County IL into IN. ..Squitieri.. 04/04/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...IWX...IND...LOT...ILX... LAT...LON 40059049 40638988 41038841 41088706 40838636 40498651 40368731 40258831 40128933 40029016 40059049 MOST PROBABLE PEAK TORNADO INTENSITY...85-115 MPH MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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