I only have seen a real tornado once in my life but I know what you are talking about. Back then I was living in the US, South Carolina to be precise. While SC is, concerning tornados, nothing compared to the tornado alley or dixie alley-states they occur there occassionally and although most are fairly weak, SC has had it's share of EF3 and EF4 tornadoes. I witnessed a tornado (one of the lower categories, EF1 at maximum) going on a rampage just a few blocks away from our house. The sirens were going and my parents were freaking out because I was standing in the backyard and watching it instead of taking shelter. I was a little boy back then and I didn't know much about tornadoes but the whole scenery, the dark clouds, the roar of the tornado and the howling sirens made a huge impression on me (although the whole spectacle lasted less than 2 minutes) and since that day I'm a nerd for tornadoes and severe weather in general.
Tornadoes are quite common in Slavic lands, too. A town in Volyn, Ukraine got hit by an EF4 storm in the late 1980s and Poland experienced quite a lot of tornadoes in 2008 (the strongest one also was an EF4). The rest of Europe, e.g. France, Germany or Italy frequently gets hit by tornadoes as well.
Concerning the outbreak you mentioned, wasn't it even the worst in US history? I've seen the footage of the tornado going through Tuscaloosa filmed by the tower camera, really eerie stuff.
Not funny, you're right, but this dramatic footage was filmed by an American of Slavic ancestry.
Yep. That makes it at least kind of Slavorum-related