Watford City

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In this June 12, 2014 aerial photo, the Missouri River winds through the countryside near Williston, N.D. The epicenter of the oil boom is a 45-mile stretch of U.S. Route 85 in North Dakota between the towns of Williston and Watford City. (AP Photo/Charles Rex Arbogast)

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The remnants of a trailer, right, and other trailers, left, relatively undamaged, Tuesday, May 27, 2014, after a tornado in Watford City, N.D. Authorities say at least eight trailers were destroyed Monday evening when the twister tore through a camp where oil field workers stay. Nine people were injured, including a 15-year-old girl critically. (AP Photo/Williston Herald, Tyler Bell)

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People search through wreckage Tuesday, May 27, 2014, after a tornado in Watford City, N.D. Authorities say at least eight trailers were destroyed Monday evening when the twister tore through a camp where oil field workers stay. Nine people were injured, including a 15-year-old girl critically. (AP Photo/Williston Herald, Tyler Bell)

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This photo taken on Monday, May 26, 2014 and provided by Dalton Barlow, shows a tornado heading towards Watford City, N.D. A National Weather Service team is headed to western North Dakota Tuesday, to assess the strength of the tornado that injured at least nine people, including a 15-year-old girl who suffered critical injuries, and damaged or destroyed 15 trailers at a workers' camp in the heart of the state's booming oil patch. (AP Photo/Dalton Barlow) MANDATORY CREDIT

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This photo taken on Monday, May 26, 2014 and provided by Jill Helmuth, shows a tornado touching down on a reach before heading towards Watford City, N.D. Authorities say several were injured and more than a dozen trailers were damaged or destroyed Monday evening when the twister tore through a camp where oil field workers stay. (AP Photo/Jill Helmuth)

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A man walks past trailers Tuesday, May 27, 2014 in Watford City, N.D, that were destroyed by a tornado the night before. Authorities say several were injured and more than a dozen trailers were damaged or destroyed Monday evening when the twister tore through the camp where oil field workers stay. (AP Photo/Josh Wood)

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This photo taken on Monday, May 26, 2014 and provided by Jill Helmuth, shows a tornado touching down on a reach before heading towards Watford City, N.D. Authorities say several were injured and more than a dozen trailers were damaged or destroyed Monday evening when the twister tore through a camp where oil field workers stay. (AP Photo/Jill Helmuth)

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Debris from a destroyed trailer is scattered Tuesday morning, May 27, 2014, after a tornado in Watford City, N.D. Authorities say at least eight trailers were destroyed Monday evening when the twister tore through a camp where oil field workers stay. Nine people were injured, including a 15-year-old girl critically. (AP Photo/Josh Wood)