We are grateful to Alessandra Iacobucci at CEREMADE-CNRS, University of Paris-Dauphine, for providing the HW filter package, to Upmanu Lall at Columbia University for sharing with us the MTM spectral analysis program, and to Michael Mann at Penn State University for making many useful statistical tools available. Comments offered by the reviewers have been very helpful in improving the manuscript and are highly appreciated. We thank Marty Booth for the editorial assistance and Jennie Shipley for preparing the COOP station data. This study was supported by the USDA–CSREES funded Drought Management, Utah Project, and approved by the Utah Agricultural Experiment Station, Utah State University, as Journal Paper 8052.
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