https://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=3568
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Several long-lived supercell thunderstorms cranked out destructive tornado families across the Midwest from late Tuesday into Wednesday morning. At least 3 deaths had been reported, according to a weather.com summary. Power was knocked out for tens of thousands of people as the wind-packing storms barreled east toward the Appalachians.
The NOAA/NWS Storm Prediction Center received 24 preliminary tornado reports for the period from 6:00 am CST Tuesday to 6:00 am Wednesday, with 2 additional reports as of late Wednesday morning. It’s possible that the final tally of tornadoes will come down from these numbers. Most of the reports were generated by just two sequences of supercell thunderstorms that spun out twisters for hours on end. One of these storm complexes tracked from far eastern Iowa into northern Illinois, while the other followed a track from far southeast Missouri through southern Illinois into southwest Indiana--a path eerily reminiscent of the nation’s deadliest tornado on record: the Tri-State Tornado of March 18, 1925 (see below).
The first and more northerly of the day’s two major tornado sequences unfolded with a short line of fast-moving supercell storms from around 4:00 to 6:00 pm CST Tuesday. A large, wedge-shaped tornado struck near Naplate and Ottawa, IL, around 4:45 pm, causing one death and producing extensive damage. As this circulation weakened, it was succeeded by one in a storm just to the south that generated frequent tornado reports from around Washburn toward Long Point (see Figure 1 above and embedded tweet at bottom). Continuing east as a non-tornadic complex, the storms produced hail as large as golf balls across the south part of the Chicago area. Tuesday’s storms across northern Illinois were being surveyed on Wednesday by NWS staff from Chicago and Lincoln, IL; results will be posted on this NWS/Chicago website.
The other major tornado producer was a more classic, isolated supercell storm that maintained its identity for more than 100 miles across parts of Missouri, Illinois, and Indiana, spitting out tornadoes along much of its path. The radar signature of the storm was especially strong over far southeastern Illinois, with a clear debris ball evident (see Figure 3 above). CNN reported that one man was killed and his wife seriously injured near Crossville, IL. The intense circulation passed extremely close to the NEXRAD radar stationed at Owensville, IN, near the NWS office serving the Evansville, IN, area (see Figure 4).
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