Dozens of people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.

Flash floods in Texas have killed at more than 80 people, many of them children.Heavy rains fell quickly in the predawn hours Friday in the Texas Hill Country, causing the Guadalupe River to rise 26 feet in just 45 minutes.

As hundreds of people respond to the catastrophic floods in Kerr County with donations and rescues, we're learning more details about how this all unfolded and how you can help.