San Marcos firefighter Jay Horton rescues a woman from in flood waters in San Marcos on May 24. Texas Governor Greg Abbott on Monday likened the ferocity of flash flooding that killed at least three people to a tsunami, and authorities said a dam had given way in a state park. (Don Anders/Reuters)

Motorists are stranded along I-45 along North Main in Houston after storms flooded the area on May 26. Overnight heavy rains caused flooding closing some portions of major highways in the Houston area. (Cody Duty/Houston Chronicle via Associated Press)

Carlos and Candy Cortez, comfort each other in the Redbird Aviation Terminal in San Marcos, Texas, on May 24 after they, their three children and one of their dogs were rescued from the roof of their San Marcos home by an Army helicopter after the Blanco River flooded. Their son A.J. Cortez, 6, lies on the couch next to them. Record rainfall was wreaking havoc across a swath of the US Midwest on Sunday, causing flash floods in normally dry riverbeds, spawning tornadoes and forcing at least 2,000 people to flee. (Rodolfo Gonzalez/Statesman.com via Associated Press)

The water line is clear on Ruth Hansen's living room wall on May 24 in San Marcos, Texas. Record rainfall was wreaking havoc across a swath of the US Midwest on Sunday, causing flash floods in normally dry riverbeds, spawning tornadoes and forcing at least 2,000 people to flee. (Nell Carroll/Statesman.com via Associated Press)

Janie Bell helps her neighbors search for possessions after their vacation home was destroyed in a flash flood along the Blanco River on May 25 in Wimberley, Texas. Several people were reported missing in flash flooding from a line of storms that stretched from the Gulf of Mexico to the Great Lakes. (Rodolfo Gonzalez/Statesman.com via Associated Press)

Edwin Acosta, 10, plays on a trampoline as the rising waters from Mountain Creek surround his family's home in the Willow Bend mobile home park on May 24 in Grand Prairie, Texas. The Dallas/Forth Worth received more than three inches of rain since midnight, with more reportedly on the way. (Smiley N. Pool/The Dallas Morning via Associated Press)

Volunteers walk up from the Blanco River and past flood debris as they help clean-up on May 26 in Wimberley, Texas. Recovery teams were searching as many as 12 members of two families who are missing after a rain-swollen river in Central Texas carried a vacation home off its foundation, slamming it into a bridge downstream. The hunt for the missing picked up after a holiday weekend of terrible storms that dumped record rainfall on the Plains and Midwest, caused major flooding and spawned tornadoes and killed at least eight people in Oklahoma and Texas. (Elaine Thompson/Associated Press)

A Dyess Air Force Base airman helps a woman and her child towards the office of the Texas State Veterans Cemetery before the beginning of a Memorial Day commemoration on May 25 in Abilene, Texas. (Nellie Doneva/The Abilene Reporter-News via Associated Press)

Rescue personnel grab the the hand of a man stranded in rushing water at the northwest corner of Lamar Blvd. and 15th St. in Austin, Texas. Shoal Creek overflowed its banks and inundated the major traffic artery with rushing water. Several cars were stalled under and near the 15th St. bridge on May 25. (Alberto Martinez/Statesman.com via Associated Press)

Ben Sioberman works to get water out of the flooded Whole Earth Provisions Company on Lamar Street after days of heavy rain on May 25 in Austin. Texas Gov. Greg Abbott toured the damage zone where one person is confirmed dead and at least 12 others missing in flooding along the Rio Blanco, which reports say rose as much as 40 feet in places, caused by more than 10 inches of rain over a four-day period. The governor earlier declared a state of emergency in 24 Texas counties. (Drew Anthony Smith/Getty Images)

From left, Mark Norris, Retha Norris, Ally Smith, 4, and Christina Norris, are rescued by firefighters after they clung in a tree at their home on South Old Stagecoach Drive in Kyle, Texas during a flood on May 24. (Jay Janner/Statesman.com via Associated Press)

Shelly Guzal (left), and her son, Grant, stand by the Blanco River by where an A-frame house owned by the Carey family once stood in Wimberley, Texas, on May 25. Corpus Christi resident Jonathan McComb and his family were guests in the house when it was swept away by floodwaters Saturday night. McComb was able to escape but his wife, Laura, and their children, Leighton, 4 and Andrew, 6, are missing. (Jerry Lara/San Antonio Express-News via EPA)

With downtown Dallas in view, water from the Trinity River floods the area below the Sylvan Avenue bridge on May 25. Several people were reported missing in flash flooding from a line of storms that stretched from the Gulf of Mexico to the Great Lakes. (Louis DeLuca/The Dallas Morning News via Associated Press)

Debi Welsh, of Corpus Christi, Texas, picks up a lamp as family and friends clean up what's left after their home was washed away by a record flood in Wimberley on May 25. (Jerry Lara/San Antonio Express-News via EPA)

Murphy Canning plays near a street that remains underwater from days of heavy rain on May 25 in Austin. Texas Gov. Greg Abbott toured the damage zone where one person is confirmed dead and at least 12 others missing in flooding along the Rio Blanco, which reports say rose as much as 40 feet in places, caused by more than 10 inches of rain over a four-day period. The governor earlier declared a state of emergency in 24 Texas counties. (Drew Anthony Smith/Getty Images)

David Lopez waits to cross the street as rain falls on May 25 in Austin. (Drew Anthony Smith/Getty Images)

Joel Venable examines the remains of a friend's vacation home that was swept down the swollen Blanco River on May 26 in Wimberley, Texas. Authorities say recovery teams will resume looking for as many as a dozen missing people, in an area where punishing rains have destroyed or damaged more than 1,000 homes and killed at least three people statewide this weekend. (Eric Gay/Associated Press)

A vehicle left stranded on a flooded Interstate 45 in Houston, Texas on May 26. Heavy rains throught Texas put the city of Houston under massive ammounts of water, closing roadways and trapping residents in their cars and buildings, according to local reports. Rainfall reached up to 11 inches(27.9cm) in some parts of the state, national forecasters reported, and the heavy rains quickly pooled over the state's already saturated soil. (Aaron M. Sprecher/AFP/Getty Images)

Mike Graf stands on the foundation of his home near Wimberley on Stone Canyon Street after it was completely swept away by the Blanco River in the flood on May 24. "It's only things," he said. "At least nobody was hurt." (Jay Janner/Statesman.com via Associated Press)

Nayeli Cervantes carries her friend's daughter Sophia Aviles through the floodwaters outside their apartment in Houston on May 26. Heavy rain overnight cause some major highways to be closed in the Houston area. (David J. Phillip/Associated Press)

Don Simons (left) and Clint Followel, volunteers from the First Baptist Church in San Marcos, Texas, help clean Toby McLroy's flood damaged home in San Marcos, Texas, on May 26. Torrential rains have killed at least eight people in Texas and Oklahoma, including two in Houston where flooding turned streets into rivers and led to nearly 1,000 calls for help in the fourth-most populous US city, officials said on Tuesday. (Tamir Kalifa/Reuters)

Andrea Jones helps remove a downed tree on River Road on May 25 in Wimberley, Texas. Around a dozen people were reported missing in flash flooding from a line of storms that stretched from the Gulf of Mexico to the Great Lakes. (Jerry Lara/The San Antonio Express-News via Assoctiated Press)

A cross sits at water-level of the still flooding Blanco River on May 26 in Wimberley, Texas. Recovery teams were searching for as many as 12 members of two families who are missing after the rain-swollen river in Central Texas carried a vacation home off its foundation, slamming it into a bridge downstream. (Elaine Thompson/Associated Press)

A home on the Blanco River was taken off its foundation after heavy overnight rain caused flash flooding in Wimberley, Texas, on May 24. Record rainfall was wreaking havoc across a swath of the US Midwest on Sunday, causing flash floods in normally dry riverbeds, spawning tornadoes and forcing at least 2,000 people to flee. (Rodolfo Gonzalez/Statesman.com via Associad Press)

Keith McNabb looks at the damage to his friend Mike Cook's house on Stone Canyon Street on the banks of the Blanco River near Wimberley, Texas on May 24. (Jay Janner/Statesman.com via Associad Press)

A person stands near the creek between the 17th and 18th fairways before the start of the final round of the Colonial golf tournament on May 24 in Fort Worth, Texas. Heavy rain in north Texas has delayed the start of the final day of the tournament. (Michael Ainsworth/The Dallas Morning via Associated Press)

A shopping center located at Texas 80 near I-35 has high water in the parking lots from the Blanco River flooding in San Marcos, Texas, on May 24. (Rodolfo Gonzalez/Statesman.com via Associated Press)

Hudson Doty, 18, (left) and Grant Guzal, 17, right, stand overlooking the Blanco River near the cement stilts of the Carey family home (far left) in Wimberley, Texas, on May 25. The Carey and McComb family, from Corpus Christi, Texas, have been missing since early Sunday morning after their home was swept away by the Blanco River in a flash flood. (Rodolfo Gonzalez/Statesman.com via Associated Press)

Melinda Ellisor looks for clothing to give to a family of flood victims at Wimberley High School on May 26 in Wimberley, Texas. Faculty and volunteers gathered at the school to organize flood relief supplies. Central Texas has been hit with severe weather including catastrophic flooding and tornadoes over the past several days. (Drew Anthony Smith/Getty Images)

Left to right, Dustin McClintock, 19, of Wimberley,, Brandon Bankston, 18, of Blanco, Hesston Krause, 22, of Smithson Valley, look at the Fischer Store Road bridge over the Blanco River near Wimberley, Texas, which was destroyed in a flood on May 24. (Jay Janner/Statesman.com via Associated Press)