Changes in mean annual Standardized Precipitation Evapotranspiration Index (SPEI) (left) and summer (June–August) SPEI (right) between the baseline (1971–2000) and 2041–2070 (top) and between baseline and 2071–2100 (bottom) for western Canadian watersheds. SPEI is determined from temperature and precipitation output from an ensemble of six CMIP5 GCMs under a high emission (RCP8.5) scenario. Positive values indicate wetter conditions, negative values indicate drier conditions.
