In the wee hours last Friday morning, the Guadalupe River in Texas Hill Country rose 26 feet in just 45 minutes in Hunt, Texas. Like all flash floods, this record-breaking water swell resulted from a large amount of rain that drenched one area over a relatively short amount of time.

More than 100 people have been confirmed dead in floods that tore through central Texas over the weekend, marking a grim milestone as searchers used boats, dogs and drones to locate victims and authorities debated whether anything more could have been done to prevent the disaster.

This is the first solid number officials have provided regarding campers who remain unaccounted for, after estimating Saturday that it could be as high as 27. There were about 750 children at Camp Mystic when the floods hit,