An Increase of disasters?

More than just a few of us are wondering if the earth is having more than a "normal" amount of weather disasters. Yesterday a tornado went through Southern California, which is extremely rare. But just so we don't think that EVERYONE agrees, here is an article from Fox News that quotes some scientists who say this is nothing unusual. You can read it and decide for yourself.
http://www.foxnews.com/story/0,2933,354692,00.html