Temperature-driven effects on Western snowpack appear more pronounced at lower elevations

Regional time series of snow water equivalent (SWE) to precipitation (P) from historical observations.

Source: Pierce et al, 2008.

Source: LandScope America

Snowmelt tends to occur during the latter part of the winter season (April/May)

Source: Kapnick and Hall, 2012.

Trends in changes in monthly snow water equivalent values

With increasing temperatures, snowpack loss may occur earlier in the season

Source: Kapnick and Hall, 2012.

Trends in changes in monthly snow water equivalent values

Projections suggest a decrease in spring snowpack and more precipitation in the form of rain

Source: Ashfaq et al 2013.

In the future, even high elevations may not escape the impacts of rising temperatures

Source: Mote, 2006.