The USA seems to be having a lot of problematic weather lately - floods and tornadoes mainly.
Roy Spencer has been going for years about how people are wrong to think that climate change is making tornadoes worse - he talks about the wind shear component that should decrease as the atmosphere warms. And I see that he has
another go this year at pooh-poohing the idea that this year's high number is due to climate change (at Fox News, of course.)
But mainstream climate scientists think the story is more complicated, and suspect that climate change is having some effect on tornadoes - although they admit this is a very difficult thing to study given their nature.
Here's a balanced article about it:
Is climate change fuelling tornadoes? Some climate scientists are quoted, and the conclusions are:
Many
of them pointed out that it can be tough to detect tornado trends
because comprehensive records only go back a few decades and there's a
lot of variability in tornado activity year to year. But they said some
shifts are starting to show: while tornado intensity doesn't appear to
have changed, there are more days with multiple tornadoes now, and there
may be a shift in which regions are especially prone to tornadoes.
Even if future storms in a higher temperature don't spawn more tornadoes, there will likely be more damaging severe storms anyway:
More broadly, Brooks said, researchers are looking at severe storm
development, because even without tornadoes, giant thunderstorms can
produce damaging hail and destructive winds. There's a robust signal
that global warming will make the atmosphere more likely to spawn such
storms.
And the wandering jet stream is not off the hook, too:
Prolonged tornado outbreaks also could potentially be linked with global
warming through a jet stream pattern that is becoming more frequent and
that keeps extreme weather patterns locked in place, Potsdam Institute
for Climate Impact Research scientist Stefan Rahmstorf suggested on Twitter.
Speaking of wind shear, I also see
a recent paper on research indicating climate change may lead to more rapidly intensifying hurricanes (as well as wetter ones.)