Leaning against chasing northern IL on Thursday at this point. I would if the somewhat marginal moisture were the only issue, but despite the deep low and a >110kt jet at 500mb, it looks like all the shear will be speed shear so we'll end up with racing bands of storms. Even right ahead of the triple point, hodos on NAM forecast soundings are nearly straight-line. I'm also not seeing the steep lapse rates needed to overcome the sub-optimal moisture for a nice low-topped outbreak like early December, April 2004, etc. Better conditions at this time look to be further east along the warm front over IN/possibly SW MI.
Still, it's a northern Illinois warm frontal setup so will continue to monitor, like the ones I mentioned those often don't look that great until the day of.