We thank authorities in the United States and Mexico for permission to obtain tree-ring samples. An earlier draft was improved by the remarks of W. H. Berger and H. Diaz. We gratefully acknowledge the comments of J. Park and one anonymous reviewer, as well as the thorough and constructive suggestions of M. E. Mann. Research funding was provided, in part, by NSF Grant ATM-9509780, by NOAA Grant NA76GP0492, and by the University of California Institute for Mexico and the United States (UC MEXUS). F. Biondi was also supported by a G. Unger Vetlesen Foundation grant to Scripps Institution of Oceanography, and by the “Premio Balzan” received by W. H. Berger. D. Cayan was funded by the NOAA Experimental Climate Prediction Center and California Applications Program.
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