This was from yesterday's tornado that flattened Greenfield, IA. Multiple vortex tornados are somewhat rare, but I've never seen anything like this one. Sometimes you get 2 or 3 at a time and usually transferring from one rotation to another so the overlap is short lived. This one just had a main circulation with sub vortices dancing around it. The last ef5 tornado was the one that struck Moore, OK in 2013. That's the longest drought in US history, but it may have ended yesterday.
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