answer: #Person1# explains to #Person2# the details about tornados in terms of two stages which are a tornado warning and a tornado watch. #Person1# further explains the sound of tornados and the causes of such sound, as wells as the danger of tornado. Then #Person1# continues expressing the danger of tornado by giving a personal experience of #Person1# encountering a tornado.
documents: #Person1#: There is a tornado warning on. My mother just told me she heard it on the radio. 
  #Person2#: What is a tornado warning? 
  #Person1#: It means that a tornado has been seen somewhere in the area. 
  #Person2#: Really? In New Berlin? 
  #Person1#: No. Not necessarily in town. But in southern Wisconsin somewhere. A tornado has been spotted. They have two stages here. This is what is called a tornado watch. That means that the weather conditions are perfect for a tornado. 
  #Person2#: I understand. They think a tornado might come. 
  #Person1#: Yes. People should look out, because maybe there will be tornadoes coming. So it's called a watch. 
  #Person2#: And the second stage is called a tornado warning. 
  #Person1#: Yes. If a tornado has been spotted, they announce a tornado warning. So if there's a tornado warning on, it means a tornado is out there somewhere. 
  #Person2#: It's scary. 
  #Person1#: Well. Tornadoes can be dangerous, it's true. If we hear something like a loud train coming, then we have to go in the basement. 
  #Person2#: What do you mean a loud train? 
  #Person1#: That is what tornadoes sound like. They sound like trains. They're very loud. 
  #Person2#: But if you hear them coming, isn't it already too late? 
  #Person1#: Maybe. It depends on the tornado. Some can move across the ground at 200 miles an hour. That is very fast. Others aren't so fast. 
  #Person2#: Have you seen a lot of them? 
  #Person1#: I've only seen one in my life. I was looking out the window. It was around two miles away. It was very interesting to watch. But it was heading toward my friend's house. So I quickly called them on the phone. 
  #Person2#: Did it hit their house? 
  #Person1#: No, it didn't. But they are glad I called them. 
  #Person2#: What were they doing when you called? 
  #Person1#: They were all sitting in the living room watching TV. They had no idea a tornado was coming toward their house. If it had hit them, they could have all been killed. 
  #Person2#: That's terrible. Do many people die in tornadoes? 
  #Person1#: Not so many really. But a lot of houses are destroyed sometimes.