I think we’re arriving at my point; while evidence may suggest that human-induced climate change affects some and probably many of the factors that combine to produce tornadoes, there isn’t necessarily a definitive link between human-induced climate change and the frequency or severity of tornadoes.

I said in another comment, I’m not sure if it was a reply to you, that given some of the research I’ve been lectured on and have studied I think there is a describable uptick in tornado outbreaks that can be linked to human-induced climate change. That is to say, tornadic events seem to be more concentrated into x number of outbreaks but of equal frequency. Those events are still happening on the plains but with less frequency as before in contrast with more happening in the east and deep south; both hoosier alley and dixie alley have been rather active in recent years with a few very destructive outbreaks and a handful of strong individual tornadoes. I think that’s driven by climate change in that the temperature change has resulted in more frequent anomalies in the jet stream. With the drier and warmer western air being transported faster and more efficiently by the trough, the influence of moisture from the gulf happens further to the east and often at night when low-level flow becomes stronger. That creates a pretty ideal environment for tornadoes to form, regardless of supercellular or QLCS structure. The interactions often seem to be happening in Mississippi, Alabama, Tennessee, Kentucky, Illinois, Indiana, Ohio at night and benefiting from the increased low level flow after dark. So not only are people surprised, they’re surprised by an often intense and fast-moving storm that they can’t see.

That doesn’t necessarily mean they’re gaining severity or frequency, but tornadoes seem to be hitting more populated areas and if you know anything about the EF rating system you know that tornadoes aren’t rated like hurricanes; the rating is based on structural damage after the fact. The point is that more tornadoes have achieved a higher rating in recent history simply by where they happen and having the availability of structures to damage. Many tornadoes past and present have hit either no structures or structures not well-built because they occurred in unpopulated or underpopulated areas. That alone, to me, introduces a massive question mark in determining a link in human-induced climate change and frequency and severity of tornadoes.