The best explanation I’ve heard came from Joe Bastardi, formerly of Accuweather.com. He’s a real pro at long range forecasting. Joe says the cause is a cooler Pacific ocean and a warmer Atlantic ocean and Gulf of Mexico. The clash of the airmasses associated with this temperature difference occurs over the SE USA. The cooler Pacific leads to cooler than normal temps in the mid and upper atmosphere which leads to large areas of instability, which, in turn promotes massive, powerful T-storms. He predicted an “active” weather season this spring for the SE USA back before Christmas and, once again, he was right. Joe also says so-called “Global warming” has nothing whatsoever to do with this most recent outbreak.
“Large tornadoes that are very strong are moving through populated areas in a part of the country that has a high mobile home population.”
It’s a well documented fact that mobile homes cause tornadoes, and UFO sightings.