Texas Hill Country Flash Floods (July 2025)

Summary

Over the July 4, 2025 weekend, catastrophic flash flooding on the Guadalupe River and across the Texas Hill Country (Kerr, Kendall, Travis, Burnet, and surrounding counties) killed 139 people, including at least 27 children and counselors at Camp Mystic near Hunt. The river rose roughly 26 feet in under an hour before dawn on July 4. It was one of the deadliest inland flood events in modern Texas history and set off a national debate over federal preparedness after staffing cuts at the National Weather Service and FEMA.

Three months assessment pending. Target cutoff Oct 4, 2025. Figures will use only sources available on or before that date.

Scored 2026-09-04 with all evidence through that date (six-month cutoff 2026-01-04 has passed; two-year 2027-07-04 has not). Later one-year tallies: 139 deaths across Central Texas / Hill Country, including 119 in Kerr County (San Antonio Express-News; Houston Public Media memorial; AccuWeather anniversary). Earlier counts: Gov. Abbott 137 by July 23, 2025 (Reuters); some Texas reporting 138. Two-year pass still queued.

Six-month pass, updated on recode with all evidence through 2026-09-04. Deaths 139 (jurisdiction/memorial total; Kerr County 119). Dollars: AccuWeather (Jul 7, 2025) estimated $18–22 billion total economic impact — property, infrastructure, tourism, supply-chain disruption, and long-term health costs. Headline uses the $18 billion floor. Cotality (~$1.1B residential buildings; NFIP context) and local Kerr County estimates (~$200M) reflect narrower scopes and are excluded. No NCEI billion-dollar listing; AccuWeather floor used as documented composite. Do not store “$18–22B” as the database field.

Scientific attribution

Rapid attribution of the July 2025 event (ClimaMeter; Faranda et al.) found the driving meteorological conditions were up to ~7% wetter than similar past events and concluded natural variability alone could not explain the change. A warmer atmosphere holds about 4% more moisture per degree C of warming, and the Office of the State Climatologist of Texas has documented up to a ~15% increase in extreme rainstorms this century; an unusually warm Gulf supplied additional moisture. Heavy rainfall is among the highest-confidence categories in the 2026 National Academies extreme-weather attribution report. Because the Hill Country ("Flash Flood Alley") also has high natural flood variability, framing is increased likelihood/intensity, not sole causation. Verify against the primary studies before treating as final.