They just had an explanation of what a multi-vortex tornado is....I didn’t get it all but one who studies these says the speed in these is 315 miles and hour, that has actually been tracked and measured. BUT he believes the speed is much greater....so this is why they become so violent.
Something to do with the air not keeping up with the speed of the tornado rotation etc. so the main vortex divides itself....as this one did.
Wow! Interesting and scary.