NAM is still synoptically very different from other guidance...it is tracking that vortmax NORTH of Lake Ontario....nevermind over it.
If it is wrong with that, then it's going to bust too warm. It's not "Sniffing out a warm layer" like we sometimes see in these events when they all agree on the synoptics. The NAM is literally about 75-100 miles north of other guidance on the vort track and that makes a huge difference.