Editorial Type:
Article
Article Type:
Research Article

Trends and Variability in Snowmelt Runoff in the Western United States

Gregory J. McCabe U.S. Geological Survey, Denver, Colorado

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Martyn P. Clark University of Colorado, Boulder, Colorado

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Print Publication:
01 Aug 2005
DOI:
https://doi.org/10.1175/JHM428.1
Page(s):
476–482
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Abstract

The timing of snowmelt runoff (SMR) for 84 rivers in the western United States is examined to understand the character of SMR variability and the climate processes that may be driving changes in SMR timing. Results indicate that the timing of SMR for many rivers in the western United States has shifted to earlier in the snowmelt season. This shift occurred as a step change during the mid-1980s in conjunction with a step increase in spring and early-summer atmospheric pressures and temperatures over the western United States. The cause of the step change has not yet been determined.

Corresponding author address: Dr. Gregory McCabe, USGS, Denver Federal Center, MS 412, Denver, CO 80225. Email: gmccabe@usgs.gov

Abstract

The timing of snowmelt runoff (SMR) for 84 rivers in the western United States is examined to understand the character of SMR variability and the climate processes that may be driving changes in SMR timing. Results indicate that the timing of SMR for many rivers in the western United States has shifted to earlier in the snowmelt season. This shift occurred as a step change during the mid-1980s in conjunction with a step increase in spring and early-summer atmospheric pressures and temperatures over the western United States. The cause of the step change has not yet been determined.

Corresponding author address: Dr. Gregory McCabe, USGS, Denver Federal Center, MS 412, Denver, CO 80225. Email: gmccabe@usgs.gov

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