One of the homes destroyed in Washington, Ill., by Sunday's storms. Tasos Katopodis/Getty Images hide caption

itoggle caption Tasos Katopodis/Getty Images

A firefighter searches through debris in Washington, Ill., on Sunday. Tornadoes and severe weather roared through the area earlier in the day. Tasos Katopodis/Getty Images hide caption

itoggle caption Tasos Katopodis/Getty Images

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

itoggle caption National Weather Service

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

itoggle caption Richard Rowe /Reuters /Landov

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

itoggle caption Bill Waugh /Reuters /Landov

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

itoggle caption National Weather Service

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

itoggle caption Lucas Jackson /Reuters /Landov

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

itoggle caption Katie Hayes Luke for NPR