A resident looks through her belongings in Parkersburg, Iowa, on Monday, May 26, 2008, a day after a tornado struck the town. (AP Photo/Kevin Sanders)

An aerial view of a residential neighborhood in Parkersburg, Iowa, is seen a day after a tornado struck the town, Monday, May 26, 2008. This year is already the deadliest for tornadoes since 1998 and is on track to break records for the number of twisters too, the National Weather Service says. (AP Photo/Kevin Sanders)

A tree sits uprooted on the front lawn of a damaged house in Parkersburg, Iowa, on Monday, May 26, 2008, a day after a tornado struck the town. (AP Photo/Kevin Sanders)

The floor of a house is all that remains after a tornado struck in Parkersburg, Iowa, on Sunday, May 25, 2008. (AP Photo/Kevin Sanders)

Residents search through belongings in Parkersburg, Iowa, on Monday, May 26, 2008, a day after a tornado struck the town. (AP Photo/Kevin Sanders)

A tattered American flag sits atop a mound of debris at a destroyed convenience store in Parkersburg, Iowa, on Monday, May 26, 2008, a day after a tornado struck the town. (AP Photo/Kevin Sanders)