It appears that most of Easter Sunday will remain dry. If you have any outside plans, you won't need the umbrella.
That will change later this evening/tonight as storm system moves closer to the area. Rain will spread over the area overnight. Some of it could be heavy at times. There could be some rumbles of thunder with it too. However, there shouldn't be any BIG storms with the first wave.
It looks as though after the first wave passes out of the area, skies will someone clear for a few hours in the mid/late morning. That will allow temperatures to increase and allow the atmosphere to get "juiced up".
A second wave of thunderstorms is expected to develop over southeast Missouri and southwest Illinois around noon (give or take an hour or two). This line will quickly move to the east. Initially, there will be isolated/scattered thunderstorms before merging in to a squall line east of the viewing area towards central Kentucky.
The SPC has the area outlooked for severe weather Monday. The below graphic runs from 7am Monday - 7am Tuesday.
Here are the probabilities of severe weather for the same time period.
Right now, it looks like the main threat from the storms will be large hail. However, we can't rule out the possibility of a few tornadoes developing.
If I can talk the boss in to it, maybe I will see if I can go storm chasing tomorrow and stream some of the video live online. Would anyone be interested in watching?