The authors wish to acknowledge the assistance of the Comision Nacional del Agua (CNA) for their continued support of the NERN data collection effort. The authors also wish to thank the Instituto Mexicano de Tecnología del Agua (IMTA) and Dr. Luis Brito for making available data from the ERIC II database and Dr. Wei Shi of the NOAA/Climate Prediction Center for producing the merged NERN–CPC gridded precipitation product. Constructive reviews of this manuscript were courteously provided by David Ahijevych and Tom Warner of the National Center for Atmospheric Research. Support for this work was provided by the NOAA Office of Global Programs (Contract NA04OAR4310166).
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