The toll in Texas floods has now climbed to at least 129, making it one of the United States' deadliest rainfall-driven flash floods.

Heavy rain and isolated flash flooding are possible this weekend in North Texas. Before storms later in the weekend, conditions will be warm and humid on Friday, July 11, according to the National Weather Service Fort Worth. Temperatures will be in the low to mid-90s, with heat index values in the triple digits.

Some governors and mayors are concerned over how current or potential cuts to agencies will impact how the government can respond in the future to major weather events.

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.

Key positions at National Weather Service offices across Texas are vacant, sowing doubt over the state’s ability to respond to natural disasters as rescuers comb through the flood-ravaged Hill Country.

There was little indication of how torrential the Texas downpours would become before dawn. At least 27 people were killed, many of them children at Camp Mystic.

Climate change is likely to make extreme weather events like those experienced in Texas occur more intensely and more frequently, scientists are warning.

"Let's put an end to the conspiracy theories and stop blaming others," Texas Agriculture Commissioner Sid Miller said in a statement.

Texas leads the country in flood deaths. Steep hills, shallow soils and a fault zone have made Hill Country, also called "flash flood alley," one of the state's most dangerous regions.