The MCS I spoke of blowing up in Illinois did exactly that. The main energy appears to be somewhat north of the area but it also has a nice extension well down to the southwest. Conventional wisdom would suggest that the storms to the south should weaken but as of 8 pm nothing seems to concerned with doing so. The storms will move through here toward midnight. Even though they may be in a weakened state, some may still be significant. I’m seeing them at 55,000 feet out west. There have been a few tornado warning issued, at least one the result of a trained spotter. Here is the Mesoscale discussion that goes along with the above map. As of 8 pm, the entire viewing area is under a severe thunderstorm watch.