Twinkle, you are a year late on Greensburg, it was wiped out last year. It nearly sustained another direct hit last week, Thursday I think. I have blogged the last several times about tornado activity in our area and posted some pics of destruction from a small tornado that passed about 5 miles to the south of us. The NWS insists still it was what they call "channelized straightline winds" but we were storm spotting that night and we say it was a tornado.
I think "Twister" was a little hyped, but there are people who do chase storms, several categories. I chase storms, but only if they are in the immediate area, the fire departments around here are also the storm spotters along with the Sheriff and his deputies. Then there are those who travel far and wide to storm chase, either for research, film making, or thrills. There are also now storm chasing tours where you pay money to do what we have a hard time on the Fire department getting people to do for free(maybe we should be charging). Do a search using "tornado tours" and "tornado chasing tours" and see what comes up.