At least 27 campers and counselors were killed at Camp Mystic during the devastating Texas floods. Some are still missing.

Potent, slow-moving storms over central Texas have begun to trigger flooding in areas already hard-hit by the state.

When storms roll in, water rushes downhill fast, gaining speed and force as it moves — often with deadly results.

In just 45 minutes early Friday morning, intense rain caused sections of the Guadalupe River in Central Texas to rise by nearly 26 feet. Four months worth of rain dropped within hours. More than 100 ...