With hurricane and wildfire season well underway across much of the country, state and local emergency managers say they have little idea how much support the federal government will provide if disaster strikes.

Environmental policy advocates gathered Monday near the White House, urging the Trump administration and Congress to support key disaster and weather agencies in the wake of catastrophic Texas floods.

A group of Central Texas flood survivors, senators and community leaders will rally at the Texas State Capitol on Monday to push for legislation that could save lives during severe weather.

The heavy rain that turned a river in Texas into a raging wall of water was fueled by unique atmospheric conditions, according to meteorologists and climate scientists.

Central Texas braces for more rain after deadly floods; officials warn of renewed flash flood risk in already saturated areas. Follow Newsweek's live blog.

Torrential rain flooded creeks, streams and the Guadalupe River, where the water swelled more than 26 feet in 45 minutes.

In areas that see rainfall and increased cloud cover, temperatures are expected to remain below seasonal averages into next week, providing some relief from the summer heat. However, much of central and southern Texas, areas in the recovery phase from the catastrophic flooding, will face dangerous heat instead of renewed flooding.

Officials are keeping a wary eye on river levels as some crews resume the search for people still missing after catastrophic flooding pummeled Texas this month.

Two days before the waters of the Guadalupe River swelled into a deadly and devastating Fourth of July flood in Kerr County, Texas, engineers with a California-based company called Rainmaker took off in an airplane about 100 miles away and dispersed 70 grams of silver iodide into a cloud.