Explaining the movement of tornadoes

01/2/2013 | Messenger (Troy, Ala.), The

Nicholas D'Andrea, a geography professor at Troy University, has been researching tornado behavior for more than 20 years, and his expertise is helping explain the damage caused by the Conecuh River Tornado in Alabama. Following the disaster, some residents wondered, among other things, how a home or business could be spared when another close by was destroyed. D'Andrea cites a phenomenon known as "suction spots," which typically last for less than 20 seconds but produce a surge of wind speed about 100 miles per hour faster than the actual tornado.

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Messenger (Troy, Ala.), The

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