We do have "small" by comparision tornadoes in Poland too since few years (2012 marketing?) and that's true damage caused is mostly shattered roofs, specifically on old buildings.
Ok, apart from that was a here known case of bus with some 40 passengers inside on a speedway turned upside down by the tornado that passed meters away, you can search for clips recorded from inside on the web. Scary.
not so completely OT: In southern Poland in mountainous area I live in it's quite common to design new houses with reinforced concrete 29x29 posts every 150-200 cm on the roof floor to which the the roof construction is tied via usually 16x16cm wall plate, roof rafters are usually 8x18, 8x20 or 8x22 (rarely 10x22) cm here, given the snow coverage weight safety regulations. Oh, and we do typically 40-45 degree roofs (again, regulations)
Here's an example of building now under construction, shops and garages on the ground floor with owner's home in the first (roof) floor:
It's slightly bigger than typical home for my area given the owner's small shops and magazines on the ground floor, but the same rules and materials are here used for standard "single family homes", notice these concrete posts to which roof construction will be bolted in weeks to come.
Just to add to Gepard's post
(BTW It was my first building I designed as an architect hehe)