[Applejinx]

It's all about chaos theory. The degree of deviation is directly relative to the amount of energy in the system. Cool the system off, and the deviation (weather) will cover a smaller range. Add energy to the system, as we are doing, and what you EXPECT to see is a titanic chaotic system behaving as chaotic systems do: becoming more chaotic, and widening its range of possible outcomes (and most likely, shortening their duration, because everything becomes more unstable).

Insane heat waves AND insane cold snaps is very much part of 'global warming', or the consistent moderate increase in energy we're doing.

Thousand and ten-thousand-year storms and extremes become yearly or monthly events as the range of the system's outputs has changed. Expect other cold snaps… and ridiculous, dangerous heat waves… and other sorts of dangerous and destructive weather events.