That was just explained by the timeline of KFOR. They went from clear skies to a F5 in 1 hour. Also conjectured that this may turn out to be the costliest Tornado in world history.
Arrgghhhhh .... OK I give up. I was wrong. I will never speak again.
Well, let’s not get carried away here. :-)
I was here at FR when it was happening today. I know this is a long thread, but please look back at the radar signature at the time of the storm. In my whole life, I had never seen a more evident radar structure and track as this one. No hook to pinpoint it was needed. It looked like a mini-hurricane as it made it's eastward track.