In some ways, out-of-towners were more vulnerable in the July 4 flood. At least 19 of the more than 100 people killed were from the Houston area.

Flooding is the deadliest natural disaster facing Oklahomans, a threat far greater than tornadoes. In the United States, flooding kills an average of 103 people a year. Tornadoes, however, caused 48 deaths on average during the same period, according to the National Weather Service.

Rescue efforts included over 2,100 responders on the ground, private helicopters, drones, boats and cadaver-detecting dogs.