A neighborhood in the eastern part of New Orleans where a tornado touched down on Tuesday. Tornadoes destroyed homes and injured dozens of people in the city. Sean Gardner/Getty Images hide caption

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Sean Gardner/Getty Images

Eshon Trosclair holds her son Camron Chapital on Tuesday after a tornado tore through while they were inside their home in the eastern part of New Orleans. The National Weather Service says at least three confirmed tornadoes touched down, including one inside the New Orleans city limits. Gerald Herbert/AP hide caption

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Gerald Herbert/AP

A man clears the debris from a destroyed convenience store in Rosalie, Ala., on Thursday, the day after a reported tornado struck the area. Brynn Anderson/AP hide caption

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Brynn Anderson/AP

Tornado Outbreaks Are On The Rise, And Scientists Don't Know Why

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This image, made from a video taken through a car window, shows a tornado near Wynnewood, Okla., on Monday. A broad tornado capable of leaving "catastrophic" damage in its wake churned across the Oklahoma landscape Monday, prompting forecasters to declare a tornado emergency for two communities directly in its path. Hayden Mahan/AP hide caption

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Hayden Mahan/AP

A fallen tree rests atop a pickup truck in Holly Springs, Miss., after a storm struck the town on Wednesday. A storm system killed several people as it swept across the South. Phillip Lucas/AP hide caption

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Phillip Lucas/AP

Purdue University students are testing new software that may track and warn about tornadoes, such as this one which struck Rochelle, Ill., in early April. Walker Ashley/AP hide caption

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Walker Ashley/AP

Social Media Can Help Track Tornadoes, But Was That Tweet Real?

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A still image from a video shows two tornadoes approaching Pilger, Neb., Monday. The National Weather Service said at least two people died in the large storm that hit northeast Nebraska. StormChasingVideo.com/AP hide caption

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StormChasingVideo.com/AP

After a tornado leveled Moore, Okla., last year, firefighter Shonn Neidel (left) developed an app that helps first responders locate storm shelters under the wreckage. Courtesy of Shonn Neidel hide caption

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Courtesy of Shonn Neidel

Storm Shelter App Helps Pinpoint People Amid Tornado's Rubble

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A severe thunderstorm wall cloud is seen over the area of Canton, Miss., on Tuesday. At least 35 people in six states have been killed by tornadoes unleashed by a ferocious storm system this week. Gene Blevins/Reuters/Landov hide caption

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Gene Blevins/Reuters/Landov