The Storm Prediction Center has put out one of their "Mesoscale Discussions" for parts of southern Missouri, western Arkansas, and eastern Oklahoma. SPC forecasters put out a Mesoscale Discussion when there are specific areas they are watching for the possibility for severe weather development and winter weather development. Tonight's MD is out for the potential for hail.
Many times meteorologists can get an good indication if SPC will issue a watch for a particular area.
At this time it doesn't appear that SPC will be issuing a Severe Thunderstorm Watch. The limiting factor is storm development should be too sporadic.
Bottom line... If you are in southeast Missouri, especially towards the Ozarks, don't be surprised to hear some rumbles of thunder overnight.