The National Water Center warned several rivers would face serious flooding by Friday afternoon, including the Colorado River near San Saba, Texas; the Guadalupe River near Comfort, Texas; the Guadalupe River near Kerrville, Texas; and the Guadalupe River near Hunt, Texas.

Thirteen people are confirmed dead, according to Kerr County Sheriff Larry Leitha. 10 p.m.: At least 24 people have been confirmed dead, according to Kerr County Sheriff Larry Leitha. Around 23 to 25 campers are still unaccounted for from Camp Mystic.

According to Lt. Gov. Dan Patrick, at least 20 children are unaccounted for at Camp Mystic, an all-girls camp of 750 campers. He says this does not mean they've been lost. "They could be in a tree. They could be out of communication. We're praying for all those missing to be found alive," he said.