For those that like to look for extremes, we have a little model battle shaping up for Wednesday morning. The Euro/GEM/HRRR are all in the camp of bringing the final lobe of cold air in before sunrise on Wednesday, really getting us cold (about 5 for the metros, below zero for the favored cold spots). However, the NAM, and to a lesser extent the GFS, are slower, not getting that wave of cold in until after sunrise causing it to be about 5 degrees warmer on the lows.
There is also likely to be a massive difference in morning lows on Thursday as the cold retreats. Higher elevations will flatline or even rise overnight while the cold pool locations will stay very cold.