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Two tornados approach Pilger, Neb., Monday June 16, 2014. The National Weather Service said at least two twisters touched down within roughly a mile of each other Monday in northeast Nebraska. (AP Photo/Eric Anderson) ( APTOPIX Severe Weather )

A man holds a girl after she was pulled from the basement of her destroyed home in Pilger, Neb., Monday, June 16, 2014. A hospital spokeswoman says at least one person is dead and at least 16 more are in critical condition after two massive tornadoes swept through northeast Nebraska. (AP Photo/Mark 'Storm' Farnik) ( Severe Weather )

A woman walks down Black Hills Trail road in Pilger, Neb., Monday, June 16, 2014. At least one person is dead and at least 16 more are in critical condition after two massive tornadoes swept through northeast Nebraska on Monday. (AP Photo/Mark 'Storm' Farnik) ( Severe Weather )

Ruth Labenz is assisted to safety by a Stanton County Sherriff's officer after her home was destroyed in the town of Pilger, Neb. Monday, June 16, 2014. At least one person is dead and at least 16 more are in critical condition after two massive tornadoes swept through northeast Nebraska on Monday. (AP Photo/Mark 'Storm' Farnik) ( Severe Weather )

A tornado forms over a house near Pilger, Neb., Monday, June 16, 2014. At least one person is dead and at least 16 more are in critical condition after two massive tornadoes swept through northeast Nebraska on Monday. (AP Photo/Mark 'Storm' Farnik) ( Severe Weather )

Tim Nelson searches for survivors in Pilger, Neb., after the town was hit by a tornado Monday June 16, 2014. Ast least one person has died due to the storm. (AP Photo/The Omaha World-Herald/Ryan Soderlin) ( Severe Weather )

Emergency personnel arrive in Pilger, Neb. Monday, June 16, 2014. At least one person is dead and 16 critically injured from tornadoes that struck northeast Nebraska on Monday. (AP Photo/The Norfolk Daily News, Darin Epperly) ( Severe Weather )

A police officer exits the Wisner-Pilger Middle School after checking for people stuck inside Monday, June 16, 2014, in Pilger Neb. The National Weather Service said at least two twisters touched down within roughly a mile of each other. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

Rescue personnel tend to a young tornado victim in Pilger, Neb., Monday, June 16, 2014. A hospital spokeswoman says at least one person is dead and at least 16 more are in critical condition after two massive tornadoes swept through northeast Nebraska. (AP Photo/Mark 'Storm' Farnik) ( APTOPIX Severe Weather )

Rick Wimer, left, and Steven Brune, both with West Point volunteer fire raise a flag in front of the Pilger Senior Center in Pilger Neb., Monday, June 16, 2014. The National Weather Service said at least two twisters touched down within roughly a mile of each other. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

A door is marked after it was searched by rescue workers Monday, June 16, 2014, in Pilger Neb. The National Weather Service said at least two twisters touched down within roughly a mile of each other. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

Firefighters go door to door and check homes for people after a tornado struck in Pilger, Neb., Monday, June 16, 2014. The National Weather Service said at least two twisters touched down within roughly a mile of each other. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

This framgrab taken from video provided by StormChasingVideo.com shows two tornados approaching Pilger, Neb., Monday June 16, 2014. The National Weather Service said at least two twisters touched down within roughly a mile of each other Monday in northeast Nebraska. (AP Photo/StormChasingVideo.com) ( Severe Weather )

Darcy Kleinschmit, left, a rural mail carrier from Norfolk, helps save the mail from the destroyed Pilger Post Office on Monday, June 16, 2014 in Pilger, Neb. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

A person looks through the remains of a building in Pilger, Neb., on Tuesday morning, June 17, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

Officials walk through the tornado damaged town of Pilger, Neb., on Tuesday, June 17, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

A camper trailer is wrapped around a tree in Pilger, Neb., following a tornado on Monday, June 16, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

Debris is scattered along Pilger, Neb., on Monday, June 16, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

Firefighters and police survey the damage in Pilger, Neb., on Monday, June 16, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

A house is destroyed after a tornado touched down in the area on Monday, June 16, 2014 in Pilger, Neb. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

People survey the damage caused by a tornado that hit Pilger, Neb., on Monday, June 16, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

A firefighter looks over the damaged cars and houses that were destroyed by a tornado that hit Pilger, Neb., on Monday, June 16, 2014. The National Weather Service says the storm that struck northeast Nebraska appears to have produced four tornadoes, one of which ravaged the town of Pilger. (AP Photo/The World-Herald, Ryan Soderlin) ( Severe Weather )

This Tuesday, June 17, 2014, aerial photo shows the devastated town of Pilger, Neb. (AP Photo/Dakota Aerials, Dave Tunge) ( Severe Weather )