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Yvette Richardson

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(Dusty Compton/The Tuscaloosa News, via AP, File)

Understanding tornadoes: Five questions answered

Paul Markowski, Yvette Richardson
This photo taken on Monday, May 26, 2014 and provided by Jill Helmuth, shows a tornado touching down on a reach before heading towards Watford City, N.D. Authorities say several were injured and more than a dozen trailers were damaged or destroyed Monday evening when the twister tore through a camp where oil field workers stay. (AP Photo/Jill Helmuth) (AP)

Understanding tornadoes: 5 questions answered

Paul Markowski, Yvette Richardson