A beloved director of a Texas summer camp for girls. An Alabama elementary student away from home. These are a few of the dozens of victims lost in devastating flooding in Texas. The flooding in central Texas originated from the fast-moving waters on the Guadalupe River on Friday,

The Texas summer camp where children died in flooding is in an area meteorologists refer to as "Flash Flood Alley."

Historic rainfall fell last week in Central Texas, with the Guadalupe River rising 25 feet in 45 minutes around 4:30 a.m. on Friday, July 4. At least 84 of the confirmed fatalities are in Kerr County, Texas, including at least 27 at Camp Mystic, a summer camp along the river. Last week, Mr. Trump signed a disaster declaration for the region.

ABC News Chief Meteorologist Ginger Zee shares how the fast flood threat developed so quickly and how early people were warned about the dangers.