Portions of Houston, Texas are underwater on Tuesday following heavy rains in the central and southeastern part of the state overnight.

As much as 10 inches of rain fell in just a few hours in some areas, killing at least eight people across Texas and Oklahoma with another 12 still reported as missing today. Tornadoes were also reported.

Transportation networks across Houton were shut down Tuesday, with road closures due to flooding widespread in the metro area, according to the local ABC affiliate.

"This is the biggest flood this area of Texas has ever seen," Texas governor Greg Abbott said on Tuesday. "It is absolutely massive - the relentless tsunami-type power of this wave of water."

Some early photos from the area are below.

Cars sit in floodwaters along Interstate 45 after heavy overnight rain flooded parts of the highway in Houston, Tuesday, May 26, 2015. Several major highways in the Houston area are closed due to high water. (AP Photo/David J. Phillip)

Stranded motorists wait for floodwaters to recede on Interstate 45. (AP Photo/David J. Phillip)

Robert Briscoe removes a suitcase from his flooded car along Interstate 45 in Houston, May 26, 2015. (AP Photo/David J. Phillip)

Cars remain stranded along a flooded section of Interstate 45 after heavy rains overnight in Houston, Tuesday, May 26, 2015. (AP Photo/David J. Phillip)

Cars remain stranded along a flooded section of Interstate 45. (AP Photo/David J. Phillip)

Shannon Morris checks on her flooded car along Interstate 45. (AP Photo/David J. Phillip)

A man walks past a cabin that was torn from its foundation in a flood on the Blanco River 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. 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. (AP Photo/Elaine Thompson)

Domingo Molina, right, paddles with his granddaughters Crystal, left, and Alicia, center, down a flooded street in Houston, Tuesday, May 26, 2015. (AP Photo/David J. Phillip)

A rescue crew walks along the Blanco River where sweeping floodwaters overturned vehicles and knocked down Cypress trees, Tuesday, May 26, 2015, 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. (AP Photo/Eric Gay)

David McGinnis helps cleanup debris at a home that was flooded along the Blanco River. (AP Photo/Eric Gay)

Joel Venable examines the remains of a friend's vacation home that was swept down the swollen Blanco River. (AP Photo/Eric Gay)

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