Because, according to the national media, everything is caused by global warming, here are two more articles in the last 24 hours lamely trying to tie tornadoes to global warming. They are here and here. You'll find lots of weasel words like "consistent with" but they all avoid one very inconvenient truth. The number of strong tornadoes -- the type that kill people -- are dropping.
Remember: if global warming isn't an extreme crisis, the research dollars drop.