On January 30, 2019, Phoenix in Arizona was comfortably 90 degrees (F) warmer than it was in Northern Illinois. The respective highs predicted were 73 and -15 degrees (windchill at -35, so there was a 110 degree difference in how the respective temperatures felt). I had experienced -40 degree wind-chill (combining the effects of the temperature and wind speed) early on two mornings one January in Northern Illinois; to think that wind-chills would flutter around -40 for 24 hours while Minnesota had experienced a -60 wind-chill (and Montana, -70!) is even more astonishing. Records, all, by the way. So why? Is all this comportable with global warming from carbon and methane accumulating in the Earth's atmosphere?
The full essay is at "Arctic Air Spills South."