Tornadoes are actually incredibly common here in the UK but they are normally extremely weak and its rare for them to do any real damage. We get occasional wrecked garden sheds and I've seen one go through a field tossing bales of straw around but never known for there to be any injuries.

We're actually incredibly lucky here, we don't get extreme weather in the same way as the rest of the world does. Hence why the whole country grinds to a halt at the slightest snow fall.