Each part of the country is subject to its own natural (threatening) phenomena, it seems. I happen to live in the Midwest region of the US, where tornadoes are what it's all about. And while I don't live in one of the worst areas (west of me is an area known as Tornado alley), anyone who lives in such a region grows up knowing what to do in the event of a tornado. Unfortunately, tornadoes sometimes arise quickly and people aren't given much warning. The footage below is from a surveillance camera. If you don't live in a tornado area (or even if you do), this will give you an idea of how quickly things can go from seemingly normal to utterly terrifying. (And for the record, I don't really have personal experience of a tornado, although they have touched down not far from me--I distinctly remember a horrid one in a neighboring suburb when I was a pre-teen. At any rate, like so many things of this nature, there probably isn't a typical experience since tornadoes come in all sizes and strengths).