Observed Shifts in Streamflow Timing
Reduced June flows in many Northwest snow-fed rivers is a signature of warming in basins that
have a significant snowmelt contribution. The fraction of annual flow occurring in June increased slightly in rain-dominated
coastal basins and decreased in mixed rain-snow basins and snowmelt-dominated basins over the period 1948 to
Northwest river basins; decreases in summer flows can make it more difficult to meet a variety of competing human and natural
demands for water. (Figure source: adapted from Fritze et al.