Higher temperatures in the mid-troposphere would make make the atmosphere more stable and produce fewer severe storms.
Similarly, polar amplification would reduce temperature differences between the equator and the poles, once again reducing the numbers of severe storms.
The reason we are seeing stormy weather over the last 12 months is because of La Nina – which makes the world cool.
People touting the global warming/severe storms idea are scientifically dysfunctional. Like Mr. Romm.