Heavy rains fell quickly in the predawn hours of Friday in the Texas Hill Country, causing the Guadalupe River to rise 26 feet in just 45 minutes.

As heavy rains led to heartbreaking losses at a Texas girls camp, other parts of the state were swamped over the July 4 weekend.

"And our cabins are high up, and for them to be flooding, it's like, you know, something's wrong," Georgia Jones said.

"There has been a lot of misinformation flying around lately, so let me clarify: the Texas Department of Agriculture has absolutely no connection to cloud seeding or any form of weather modification," Miller said in a statement.

The National Weather Service extended a flood watch July 7 through 7 p.m. local time for much of central Texas.

Officials say at least 81 people have died in flooding triggered by unrelenting rain Thursday night into Saturday.

Search teams looking for dozens of people still missing after flash floods in central Texas faced the danger of more heavy rain and thunderstorms on Monday after a disaster that has killed at least 78 people including 28 children.

Radar data can estimate rainfall to a fairly accurate amount. The rain data in the case of the deadly tragedy that unfolded in the Texas Hill Country last weekend shows exactly why the area around Camp Mystic and the Guadalupe River, outside of San Antonio, had such a raging flash flood.

The Gulf, which borders Texas, has become significantly warmer in recent years due to climate change, Swain explained. This results in a very warm body of water that produces a lot of evaporation, releasing more tropical moisture into the air than seen historically.

Going back through U.S. weather station records dating to 1955, Kunkel found that rain over the past 20 years has become more intense in the eastern two-thirds of the country, including the southern Great Plains, where Texas is located. Intensities have remained the same or declined in the West and southwest.