Well, assuming I left on 80 from Chicago like I said I was going to in my last post, although I didn't update my status, I probably would have stopped near Des Moines for the night as that's usually about where I catch my nap when heading to the plains the day before an event.
Based on your upper air charts there, I'd like to be in southwest SD where the trough is going to eject later in the day. Shear should be best here, and I think this is the more sure play despite the possibility of more isolated storms further south along the dryline. I'm gonna have to really haul ass down 80, up 380 to 90 west. I'd like to try and make it all the way to Rapid City. That's a 9 hour drive or so from Des Moines with stops for gas, so if this is an afternoon show I'm probably going to miss it. I've also never chased SD, but I imagine the terrain near the Badlands and Black Hills is difficult to work around.