Data released Tuesday shows that the deadly El Reno tornado that struck Friday was the widest every recorded in the U.S., at 2.6 miles. National Weather Service hide caption

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Friday's storm, which produced a mile-wide tornado, as it neared El Reno, Okla. Richard Rowe /Reuters /Landov hide caption

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Why Chase Tornadoes? To Save Lives, Not To 'Die Ourselves'
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After the storm: Sheet metal that was torn off a building during Friday's tornado in El Reno, Okla., ended up caught in a tree. Bill Waugh /Reuters /Landov hide caption

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Tuesday's weather is expected to be bad from Texas up into the nation's midsection and across to the Great Lakes. National Weather Service hide caption

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Rita Green carried a plastic bin of items as she helped a family friend salvage things from a home Thursday in Moore, Okla. Lucas Jackson /Reuters /Landov hide caption

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Students and teachers from Eastlake Elementary and Plaza Towers Elementary schools gathered Thursday to say goodbye for the summer. This was a chance to reconnect after the devastating tornado brought an abrupt end to the school year at Plaza Towers in Moore, Okla. Katie Hayes Luke for NPR hide caption

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After The Storm: Students Gather For One More School Day
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Floodwaters from Superstorm Sandy destroyed the first floor of this house in Staten Island, New York. Most of the people who drowned during the storm died in their homes in low-lying areas of New York and New Jersey. Paul J. Richards/AFP/Getty Images hide caption

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