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

Regional and TS Alberto Isotope Variability Regionally (Ciudad Victoria and Monterrey), δ 18 O values ranged from 3.60‰ to −16.52‰ with a) higher δ 18 O values during winter months (December to February), b) a decreasing trend from April to June and again from August to October, periods characterized by the wet season and the activation of tropical storm systems, respectively, and c) an increasing trend during July and August (Figure 4a ). δ 18 O values during TS Alberto ranged from −2.80‰ to −15.82‰, with a mean of −8.59 (±3.40) ‰ (Figure 4a ).

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