twister fate that saved an entire high school graduating class from a tornado's fury and later star weatherman sam champion on this season of wild weather. what's behind it? ♪ [ male announcer ] in 2011, at&t is at work, building up our wireless network all across america. we're adding new cell sites... increasing network capacity, and investing billions of dollars to improve your wireless network experience. from a single phone call to the most advanced data download, we're covering more people in more places than ever before in an effort to give you the best network possible. at&t. rethink possible. two of the most important are energy security and economic growth. north america actually has one of the largest oil reserves in the world. a large part of that is oil sands. this resource has the ability to create hundreds of thousands of jobs. at our kearl project in canada, we'll be able to produce these oil sands with the same emissions as many other oils and that's a huge breakthrough. that's good for our country's energy security and our economy. >> it's indescribable. i don't know what to say

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twister fate that saved an entire high school graduating class from a tornado's fury and later star weatherman sam champion on this season of wild weather. what's behind it? ♪ [ male announcer ] in 2011, at&t is at work, building up our wireless network all across america. we're adding new cell sites... increasing network capacity, and investing billions of dollars to improve your wireless network experience. from a single phone call to the most advanced data download, we're covering more people in more places than ever before in an effort to give you the best network possible. at&t. rethink possible. >> it's indescribable. i don't know what to say other than that. i've never seen anything like it. >> that's what is left of joplin's high school. anderson cooper is live in joplin tonight in missouri. anderson, these are quite desperate scenes. the pictures of really horrific. you got there the last few hours. what are you making of what you're seeing? >> reporter: it is really -- as you said, it's obviously horrific. what maybe the pictures don't show is the weather that's still -- the weather syst