National Weather Service has issued tornado warnings for parts of Illinois and Texas.

...Potential For Significant Severe Weather Across The Mississippi Valley...
A strong cold front moving through the Mississippi Valley will trigger severe thunderstorms with large hail and damaging winds. Isolated tornadoes could also develop. The threat of severe weather extends from the Upper Mississippi Valley and Great Lakes to the Gulf Coast area. The greatest threat area will be in the Mid-Mississippi Valley from extreme northern Louisiana to central Illinois.