Flash flood alley is a curved-shaped region about 300 miles long and 50 miles wide in central/south-central Texas, extending from north of Dallas to southwest of San Antonio. Its location, weather patterns, and geology often combine to create devastating floods.

Flash floods in Texas killed at least 82 people over the Fourth of July holiday weekend and left others still missing, including girls attending a summer camp. The devastation along the Guadalupe River,

Kerrville, Texas was hit especially hard by flash flooding after heavy rain swelled two forks of the Guadalupe River, according to officials. Residents told CNN affiliate KSAT how the flood caught them by surprise and destroyed their homes.

Rescuers searched for survivors at Camp Mystic on the bank of the Guadalupe River in Hunt, Texas, after deadly floods swept through the area on July 4.