---
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caption: "Reduced June flows in many Northwest snow-fed rivers is a signature of warming in basins that\r\n    have a significant snowmelt contribution. The fraction of annual flow occurring in June increased slightly in rain-dominated\r\n    coastal basins and decreased in mixed rain-snow basins and snowmelt-dominated basins over the period 1948 to\r\n    2008.<tbib>cc98a8b5-74b3-4df2-8961-7799768da2ed</tbib> The high flow period is in June for most\r\n    Northwest river basins; decreases in summer flows can make it more difficult to meet a variety of competing human and natural\r\n    demands for water. (Figure source: adapted from Fritze et al.\r\n    2011<tbib>cc98a8b5-74b3-4df2-8961-7799768da2ed</tbib>)."
chapter:
  description: ~
  display_name: 'Chapter 21: Northwest'
  doi: 10.7930/J04Q7RWX
  identifier: northwest
  number: 21
  report_identifier: nca3
  sort_key: 210
  title: Northwest
  url: http://nca2014.globalchange.gov/report/regions/northwest
chapter_identifier: northwest
cited_by: []
contributors: []
create_dt: 2012-10-28T13:20:00
description: "Reduced June flows in many Northwest snow-fed rivers is a signature of warming in basins that\r\n    have a significant snowmelt contribution. The fraction of annual flow occurring in June increased slightly in rain-dominated\r\n    coastal basins and decreased in mixed rain-snow basins and snowmelt-dominated basins over the period 1948 to\r\n    2008.<tbib>cc98a8b5-74b3-4df2-8961-7799768da2ed</tbib> The high flow period is in June for most\r\n    Northwest river basins; decreases in summer flows can make it more difficult to meet a variety of competing human and natural\r\n    demands for water. (Figure source: adapted from Fritze et al.\r\n    2011<tbib>cc98a8b5-74b3-4df2-8961-7799768da2ed</tbib>)."
display_name: '21.1: Observed Shifts in Streamflow Timing'
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href: http://52.38.26.42:8080/report/nca3/chapter/northwest/figure/observed-shifts-in-streamflow-timing.yaml
identifier: observed-shifts-in-streamflow-timing
images:
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    create_dt: 2012-10-28T13:20:00
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    title: Observed Shifts in Streamflow Timing
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references:
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    uri: /reference/cc98a8b5-74b3-4df2-8961-7799768da2ed
report:
  display_name: 'Climate Change Impacts in the United States: The Third National Climate Assessment'
report_identifier: nca3
source_citation: 'adapted from Fritze et al. 2011<tbib>cc98a8b5-74b3-4df2-8961-7799768da2ed</tbib>'
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title: Observed Shifts in Streamflow Timing
type: figure
uri: /report/nca3/chapter/northwest/figure/observed-shifts-in-streamflow-timing
url: http://nca2014.globalchange.gov/report/regions/northwest/graphics/observed-shifts-streamflow-timing
usage_limits: Copyright protected. Obtain permission from the original figure source.