I am grateful to Atoossa Bakhshaii who helped with the graphics. This research was supported with a grant from the Canadian Natural Sciences and Engineering Research Council.
Bakhshaii, A., and R. Stull, 2009: Deterministic ensemble forecasts using gene-expression programming. Wea. Forecasting, 24, 1431–1451.
Stull, R., 2011: Meteorology for Scientists and Engineers. 3rd ed. Discount Textbooks, 924 pp. [Available online at http://www.eos.ubc.ca/courses/atsc201/MSE3.html.]