Ahem. The climate (ocean-atmosphere system) is extremely complex and chaotic. "Choatic" means that slight changes in the system can lead to widely divergent results, the so-called "butterfly effect". There are a variety of theories vying to be the explanation of recent weather, and all have their weaknesses. Theory no. 1 suffers from the fact that the increase in the "waving" of the jet stream over the past few decades is disputed. Theory no. 2 needs a longer data record to show it has merit. Theory no. 3 also needs more substantiation. Theory no. 4 is disputed by some who say there really hasn't been an increase in autumn snowfall in Siberia. Theory no. 5 (not so much a theory but a point of view) is the traditional wisdom. One thing is common: climate change. But then, is the Arctic a major driver of Northern Hemisphere climate, or is it not? Time may tell.