Statistical Methods in the Atmospheric Sciences, Fourth Edition has always strived, and succeeded, to meet the needs of students and instructors, in addition to supporting researchers and operational practitioners as a comprehensive, but still usable, reference. This newly revised fourth edition continues in that tradition. Updates, new topics and expanded sections build upon the strengths of the prior edition, while providing new content where there have been advances in the field, including Bayesian analysis, forecast verification and a new chapter dedicated to ensemble forecasting. Provides a strong yet concise introduction to applied statistics, specific to atmospheric science Revised and expanded sections on nonparametric tests, test multiplicity, and quality uncertainty descriptors New sections on ANOVA, quantile regression, the lasso and other regularization methods, regression trees, changepoint detection, ensemble forecasting, and exponential smoothing.