Study: Extreme flash flooding events made worse by lack of planning, governance

Monday, Jul 06, 2026 • Greg Pederson :

Ricardo Sánchez-Murillo, UTA associate professor of Earth and environmental sciences

A new commentary co-authored by Ricardo Sánchez-Murillo, UTA associate professor of Earth and environmental sciences, examines how losses from extreme flash flooding events are often exacerbated by a lack of planning and governance.

The article, titled “Rapid drought-to-flood weather whiplash amplifies climate change governance failure”, was published in the May 22 edition of the journal Nature Water. Weather whiplash is an abrupt and intense change from one extreme weather condition to another, such as from drought to flooding, which is the focus of the commentary.

Sánchez-Murillo and his co-authors studied drought-to-flood episodes in the Texas Hill Country, central-eastern Mexico, southern Brazil, and Valencia, Spain that occurred in 2024-25. In all four cases, areas experiencing drought conditions were suddenly inundated with extreme amounts of rainfall, which caused extensive flooding and led to loss of life and catastrophic damage to infrastructure.

“Rapid ‘weather whiplash’ is increasingly exposing weaknesses in climate adaptation, land-use planning, emergency response systems, and socio-environmental governance,” Sánchez-Murillo said. “These events are not isolated anomalies, but rather emerging manifestations of a more volatile hydroclimate under climate change. The rapid shift from prolonged drought to extreme rainfall and flooding creates complex hydrological and societal responses that conventional monitoring and forecasting systems often struggle to capture.”

What failed consistently, the authors wrote, was not only physical protection — that is, flood mitigation infrastructure — but the capacity of local and national governance plans to reduce differential exposure and vulnerability among populations. In the central Texas case, heavy rains on July 4-6, 2025 caused a rapid rise in the Guadalupe River and severe flooding during which at least 137 people died, including 27 at a girls’ summer camp.

The disasters discussed in the article showed that most existing adaptation frameworks remain poorly aligned with the realities of weather whiplash, particularly the speed at which drought-to-flood transitions occur, the authors wrote. They concluded that priority needs to be given to strengthening anticipatory capacity, land management, and infrastructure design.

Sánchez-Murillo also noted the potential value of introducing stable water isotope observations into the study of weather whiplash. A separate paper, co-authored by Sánchez-Murillo and published in Geophysical Research Letters, examines the role of oceanic and terrestrial evaporation in prolonged dry or wet periods.

Stable isotope compositions can be used to trace flows of water, including evaporation, precipitation, and transpiration. In the study highlighted in Geophysical Research Letters, stable water isotope data was used to trace the origins of precipitation and to introduce a new global tool, the isotope-based Evaporation and Moisture Recycling Index (iEMI), to identify anomalous dry periods. The iEMI links evaporation-driven rainfall to major droughts in Europe, Africa and Australia and captures anomalies linked to the El Niño-Southern Oscillation, the authors wrote.

“Integrating isotope hydrology with hydroclimatic monitoring and forecasting could substantially improve our understanding of the mechanisms driving these extreme transitions, catchment/aquifer responses, and strengthen adaptation strategies,” Sánchez-Murillo said. “We hope this contribution stimulates broader interdisciplinary discussion on how to better monitor, understand, and adapt to rapid hydroclimatic variability.”

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