Generally wet years have higher tornado rates than dry.
Both of these conditions often relate to El Nino/La Nina conditions in the ocean currents off Chile and to movements in the Jet Stream. This year the Jet Stream stayed where it belongs, across Canada, in El Nino years it gets sucked south into a u-shape over the US. You'd know that if you had paid attention to fire conditions in California, or weather reports generally, though I don't remember El Nino being talked about in US weather reports in the 70's and I left in 1980. Maybe Canadian news is just more thorough about the weather, as it is in so many things.
Global warming, as the name suggests, James, is a Global phenomenon which isn't determined by a single Tornado season in the United States. It is, surprisingly, a Global thing. You can have lots of Arctic and Antarctic melting without the mainland of the US noticing much. It is certainly clear this past year that melting in both the Arctic and Antarctic has been progressing at faster rates than those predicted even by Global warming enthusiasts. It has also been noted that sea levels have risen measurably in the last 5 years.
Now just because it hasn't invaded your home, James, isn't a reason to say it doesn't exist. And I would have thought that Sandy (an historically high letter value for Tropical Storms though not a record) would have given you a hint as to what was actually happening, however "there is none so blind as he who has eyes, but will not see."
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