Extreme Rainfall Contribution and Isotopic Excursion of Tropical Storm Alberto in Northeastern Mexico

Odalys J Ibarra-Alejos; Ricardo Sánchez-Murillo; Rene Ventura-Houle; Oscar Guevara Mansilla; Tomas Peña-Alonso; Bárbara A Macías-Hernández; Luis González-Hita; Miguel A Mejía-González

doi:10.1002/rcm.10146

Extreme Rainfall Contribution and Isotopic Excursion of Tropical Storm Alberto in Northeastern Mexico

Rapid Commun Mass Spectrom. 2026 Jan;40(1):e10146. doi: 10.1002/rcm.10146.

Authors

Odalys J Ibarra-Alejos¹, Ricardo Sánchez-Murillo², Rene Ventura-Houle¹, Oscar Guevara Mansilla³, Tomas Peña-Alonso³, Bárbara A Macías-Hernández¹, Luis González-Hita⁴, Miguel A Mejía-González⁴

Affiliations

¹ Universidad Autónoma de Tamaulipas, Facultad de Ingeniería y Ciencias, Centro Universitario Victoria, Ciudad Victoria, Tamaulipas, México.
² Department of Earth and Environmental Sciences, The University of Texas at Arlington, Arlington, Texas, USA.
³ Universidad Autónoma de Tamaulipas, Facultad de Ingeniería Tampico, Tampico, Tamaulipas, México.
⁴ Department of Hydrology, Mexican Institute of Water Technology, Jiutepec, México.

Abstract

Rationale: Tropical cyclones are critical extreme rainfall events that can temporarily mitigate drought impacts in semiarid regions. Despite the well-known North Atlantic hurricane season, the propagation of isotopically distinct rainfall pulses across semiarid landscapes of Mesoamerica is largely unknown.

Methods: In June 2024, tropical storm (TS) Alberto made landfall in northeastern Mexico. This study evaluates TS Alberto's monthly and annual rainfall contribution across Tamaulipas and Nuevo León and the isotopic excursions (δ¹⁸O and d-excess) in precipitation and surface water. Rainfall data from 86 stations and high-frequency isotope samples from Ciudad Victoria, Tampico, Chetumal, and the San Marcos River were analyzed.

Results: Results show that TS Alberto produced unprecedented rainfall, ranging from 0.22 to 11.41 times the 10-year June average, and up to 123% of the annual average in orographically influenced regions (i.e., variation is based on 86 locations across the region). Reservoir data highlight a rapid hydrological recovery, with dam levels in Tamaulipas and Nuevo León increasing significantly within weeks. Rainfall isotopic composition exhibited a broad spectrum (δ¹⁸O: -15.82‰ to -2.80‰), reflecting varying moisture sources, convective activity, and orographic effects. TS Alberto reproduced nearly the entire annual δ¹⁸O variability within a few hours, underscoring the strong isotopic imprint of extreme events. During TS Alberto's landfall and passage, an inverse trend between δ¹⁸O and precipitation amount was observed.

Conclusions: The storm's isotopic signature was traced into surface waters, providing evidence of rapid river response and potentially for aquifer recharge. These findings emphasize the dual hydrological and isotopic role of TCs in modulating water scarcity and improving hydroclimate reconstructions in drought-prone landscapes.

Keywords: drought; northeastern Mexico; rainfall contribution; semiarid region; tropical storm Alberto; water isotopes.

Abstract

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