Two people were reportedly killed in flooding in Houston, raising the death toll from Harvey to three.
Texas Gov. Greg Abbott activated 3,000 federal and state guard members and said 18 counties are now under the disaster declaration Sunday.
The White House announced President Donald Trump plans to travel to Texas Tuesday.
Houston’s Hobby airport will be closed until at least Wednesday due to flooding on the runways and roads.
All of the Houston Independent School District’s schools and offices will be closed for the week.
Dallas is preparing its convention center to become a “mega shelter” for evacuees.