Since 1948, there has never been 10mb Polar Vortex as displaced anomaly wise (strength-distance from northpole) as the last few weeks. This really far south, and all 206 events that have happened never centered so far south in North America. I also found a pattern in the last 4-5 years with how 10mb pattern evolved that was much different from all years before. It's hard to explain, but an example is before you would have an 85% chance of a switch after a 40-60 day event.. now it takes a break for 7-10 days, kind of comes back, wanes, etc.  Outer part of this anomaly all the way down to Southwest, US.