Debris lies on the ground as residents clean up after a tornado swept through Bondurant, Iowa, Thursday, July 19, 2018. A flurry of tornadoes swept through central Iowa Thursday afternoon, flattening buildings and damaging the courthouse in Marshalltown and hitting an agricultural machinery plant in Pella as people were working. (Brian Powers/The Des Moines Register via AP)
By: Brian Powers
Damage to production plants at Vermeer Corp., a farm and construction equipment manufacturer in Pella, Iowa, is seen in an aerial view, Thursday, July 19, 2018, after a tornado went through the area. (Rodney White/The Des Moines Register via AP)
By: Rodney White
A worker cleans up debris from the tornado damaged Marshall County Courthouse's tower Thursday, July 19, 2018, in Marshalltown, Iowa. Several buildings were damaged by a tornado in the main business district in town including the historic courthouse. (AP Photo/Charlie Neibergall)
By: Charlie Neibergall
A local resident runs past a tornado-damaged building on Main Street, Thursday, July 19, 2018, in Marshalltown, Iowa. Several buildings were damaged by a tornado in the main business district in town including the historic courthouse. (AP Photo/Charlie Neibergall)
By: Charlie Neibergall
An uprooted tree lies in front of the tornado damaged Marshall County Courthouse, Thursday, July 19, 2018, in Marshalltown, Iowa. Several buildings were damaged by a tornado in the main business district in town including the historic courthouse. (AP Photo/Charlie Neibergall)
By: Charlie Neibergall
Local residents walk past a tornado-damaged building on Main Street, Thursday, July 19, 2018, in Marshalltown, Iowa. Several buildings were damaged by a tornado in the main business district in town including the historic courthouse. (AP Photo/Charlie Neibergall)
By: Charlie Neibergall
A local resident rides his bike past a toppled street sign on Main Street, Thursday, July 19, 2018, in Marshalltown, Iowa. Several buildings were damaged by a tornado in the main business district in town including the historic courthouse. (AP Photo/Charlie Neibergall)
By: Charlie Neibergall
Roy Schweinebart, of Marshalltown, Iowa, shovels bricks from a tornado-damaged building near Main Street, Thursday, July 19, 2018, in Marshalltown, Iowa. Several buildings were damaged by a tornado in the main business district in town including the historic courthouse. (AP Photo/Charlie Neibergall)