(Disclaimer: I'm looking at this from an Alabama/Mississippi perspective). A potential fly in the ointment I'm seeing from the 12z GFS is a pretty substantial warm nose/EML in the 800-600mb layer. By the time that layer cools through lifting, the LLJ is starting to eject northward and hodographs become significantly straighter. That warm layer is going to make it hard to sustain intense updrafts, at least in the afternoon/early evening hours while you have stronger diurnal heating.
The 06z Euro doesn't have as prominent of a warm layer and it depicts a prefrontal trough out ahead of the main cold front. That could spell trouble.