Observed Shifts in Streamflow Timing

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
2008.cc98a8b5-74b3-4df2-8961-7799768da2ed The high flow period is in June for most
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.
2011cc98a8b5-74b3-4df2-8961-7799768da2ed).

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Physical Climate, Observations, Water Resources