The Storm Prediction Center still has Southeast Missouri, Southern Illinois, Western Kentucky, Northwest Tennessee, Northeast Arkansas, and Indiana in a "Slight Risk" for severe weather for today/tonight. See below graphic for the outlook valid through 7am Wednesday.
Looking at their probability graphics shows that their biggest concern is damaging winds.
Most likely a squall line will form late tonight across the central part of Missouri. The line will then race east through the Heartland overnight.
I'm headed to St. Louis for the day so I won't be able to post any updates until later tonight.