Severe weather was moving through Mississippi early Thursday after apparent tornadoes tore through parts of Oklahoma, Texas and Louisiana.
President Donald Trump viewed damage in Putnam County where a tornado killed 18 people, including five children.
Emergency officials say they believe the systems in place to warn people worked properly.
No place saw more destruction than pockets of Putnam County.
Rescuers search for victims after tornadoes caused damage in Nashville and other parts of the state.
Severe weather destroys several buildings, injures many people, in and around Nashville.