I was a northwest person and went to school in Tornado Alley. The first night, there was a tornado watch. I spent all evening getting soaking wet, until enough people laughed at me and asked me what I was doing. The point is, I think you are supposed to be afraid. This is natural response to a real threat. You may be a little more fearful than some, but Joplin was Horrible. Let some time pass and if you do not alter your life much because of this, let it cool down. You don't sound obcessed. The thing with fears, is they only have to happen once to have a traumatic impact. Then everytime you are vigilent, you fear is reinforced as in your head, somehow you just avoided tragedy, when really your fear did nothing. Try to grasp that concept and you should keep getting better. I have to sign off, but will respond tomorrow if any questions.