Jonathan King, University of Arizona, Department of Geosciences, Tucson, AZ, United States, Kevin J Anchukaitis, University of Arizona, Tucson, AZ, United States, Jessica E Tierney, University of Arizona, Geosciences, Tucson, AZ, United States, Feng Zhu, University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States, Julien Emile-Geay, Univ. of Southern California, Department of Earth Sciences, Los Angeles, CA, United States, Gregory J. Hakim, University of Washington, Department of Atmospheric Sciences, Seattle, WA, United States and Robert Wilson, University of St. Andrews, St Andrews, United Kingdom