It still looks like there is a chance for thunderstorms around Missouri, Illinois, Kentucky, Tennessee, Arkansas, and Indiana Sunday. The SPC (Storm Prediction Center) still has parts of those states under a "Slight Risk" of severe weather from 7am Sunday - 7am Monday in their day 2 outlook. (See below graphic.)
Temperatures are expected to be in the 70°'s and dew points are expected to be in the lower 60°'s. So it is going to feel a bit more humid.
There could be a few scattered showers/thunderstorms around the area Sunday morning, but they should behave.
As the day progresses, temperatures/dew points will increase. A cold front will start to sweep in from the west by mid-day. Ahead of and along the cold front more wide spread thunderstorms will develop. This is most likely when the stronger to severe thunderstorms will move through the area. Once the sun sets, we will lose some of the energy as temperatures drop. So storms should quickly diminish in intensity.
It still appears that the main threat will be large hail and damaging winds. However, there is a little turning in the atmosphere, so it isn't out of the question we could see a quick spin-up of a tornado.
Another reminder... Today would be a great time to go out and purchase a NOAA Weather Radio. They can be lifesavers!