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A storm shelter, right, is where Raella Faulkner and Bobby McElroy and others took shelter in Vilonia, Ark., as a tornado struck the town on Sunday, April 27, 2014. Vilonia was hit hard Sunday after a tornado system ripped through several states in the central U.S. and left more than a dozen dead in a violent start to this year's storm season, officials said. (AP Photo/Karen E. Segrave) ( Severe Weather )

In this Thursday, May 1, 2014 photo, Thunderground Storm Shelters' Dustin Wagner, left, and Jacob Ortiz, center, assist as Jim Hohnsbehn digs a hole for a storm shelter in the garage at a residence in Oklahoma City. Last year's deadly tornadoes, which killed more than 30 people, scared Oklahomans in a way that previous storms had not, moving them to add tornado shelters or reinforced safe rooms to their homes. In fact, surging demand has overwhelmed companies that build the shelters. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

In this Thursday, May 1, 2014 photo, Jacob Ortiz, of Thunderground Storm Shelters, directs as the finishing touches are put on a hole for a storm shelter installation in the garage of a residence in Oklahoma City. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

In this Thursday, May 1, 2014 photo, Jacob Ortiz, of Thunderground Storm Shelters, puts the finishing touches on a hole for a storm shelter installation in the garage of a residence in Oklahoma City. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

In this Friday, May 2, 2014 photo, Art Munoz, of GFS Storm Shelters, maneuvers a storm shelter into a garage at a residence in Yukon, Okla. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

In this Friday, May 2, 2014 photo, Art Munoz, of GFS Storm Shelters, lowers a storm shelter into a hole dug through the slab in a garage as Vic Rodriguez assists him at a residence in Yukon, Okla. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

In this May 26, 2013, file photo, an underground shelter is seen near tornado rubble in Moore, Okla. (AP Photo/Charlie Riedel, File) ( Storm Shelters-Shortage )

In this Thursday, May 1, 2014 photo, Jim Hohnsbehn, left, and Jacob Ortiz, of Thunderground Storm Shelters, pour bags of concrete around the sides of a storm shelter during an installation into the garage of a residence in Oklahoma City. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

In this Thursday, May 1, 2014 photo, Jim Hohnsbehn, left, Dustin Wagner, center, and Jacob Ortiz, of Thunderground Storm Shelters, prepare to fill in the sides of a hole with concrete during the installation of a storm shelter in the garage of a residence in Oklahoma City. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )

Workers cut a tree behind an open storm shelter in Louisville, Miss., Tuesday, April 29, 2014. (AP Photo/Rogelio V. Solis) ( Severe Weather )

In this Thursday, May 1, 2014 photo, Tessa Beaulieu poses for a photo in the storm shelter of her new construction home with her children, from left, Hudson, Dawson and Sloane, in Edmond, Okla. (AP Photo/Sue Ogrocki) ( Storm Shelters-Shortage )