Layer shows the historical and projected annual maximum snow water equivalent (SWE), a measure of the total amount of water contained in the snowpack. The figure compares historical conditions (1970 - 1999, in inches) with the projected change in percent for ten global models, based on a 0.0625 degree (about 3 by 4.5 miles) resolution set of gridded projections. Two time periods are considered: the 2040s (2030 - 2059) and the 2080s (2070 - 2099), based on a moderate greenhouse gas scenario (A1B). Results are only shown for watersheds with an average historical April 1st SWE of at least 0.4 inch, and for which at least 8 out of the 10 models agree on the direction of change. White to dark blue shading on the historical map indicates areas which received highest levels of April 1st snow water equivalent in Puget Sound. Projected decreases in snow water equivalent are depicted by the yellow to red shading. Figure created by Jonathan Picchi-Wilson, Western Washington University, based on the CMIP3 projections used in the IPCC 20074 report. Data source: Hamlet et al. 2013.