Nearly a week after deadly floods struck Central Texas, search and rescue teams are continuing to probe debris for those still missing.

The Texas Hill Country has been notorious for flash floods caused by the Guadalupe River. Here's why the area is called "Flash Flood Alley."

More than 100 deaths have been reported statewide, with most near the Guadalupe River. Several girls from the Dallas area are among the deaths confirmed from Camp Mystic.

Texas Agriculture Commissioner Sid Miller dismissed conspiracy theories linking his agency to cloud seeding, saying it hasn't been involved in weather modification since 2011.

Businesses large and small also sprang into action to help the community. Grocery chain H-E-B, which started in Kerrville, one of the cities affected by the floods, has been donating food and supplies through the Red Cross. San Antonio-based fast-food chain Whataburger said it would provide meals to first responders.

The situation evolves daily. Several nonprofit groups that have arrived said they plan to remain on the ground for the next few weeks, providing physical, emotional, and spiritual support.

In what experts call "Flash Flood Alley," the terrain reacts quickly to rainfall steep slopes, rocky ground, and narrow riverbeds leave little time for warning.

In Kerr County, Thad Heartfield is leading nearly 100 volunteers searching for flood victims. For him, this mission is personal. His son and three of his son's friends disappeared in the flood.

Also: San Antonio mourned the victims in a Travis Park vigil; UTSA said one of its teachers died in the Guadalupe River flood; Kerrville officials said a privately owned drone collided with a helicopter conducting search and rescue operations.

The flooding brought the Guadalupe to its second-highest point in history, according to the National Weather Service, which urged people in the affected area to move to higher ground.