I added MI to this discussion... Not sure whether tonights stuff would count as a new thread since it's closely related to what's going on now...
Anyway, 18Z NAM brings instability in a bit quicker than the 12Z run, mainly between 6Z and 12Z tonight/tomorrow morning. Even with marginal instability, the combination of forcing and extreme shear alone are worth something.
NAM goes bonkers, developing an MCS over southern WI and blowing it up into quite a monster, taking out much of MN, MI, and heading into Ontario, Canada. Looking at the satellite, NEXRAD, and SFC obs, I'm not seeing much in southern MN as of now...