Multi-Century Evaluation of Sierra Nevada Snowpack

Because of the tree-ring temperature problem, I am not fond of proxy records UNLESS they overlap the modern instrument era. Still, this is a fairly short range and well overlaps the modern instrument era:

The 2015 record low snowpack level in California’s Sierra Nevada mountain range is unprecedented in comparison to the past 500 years, according to a new paper published in Nature Climate Change (link is external). In their examination of paleoclimate tree-ring based records dating back to 1500, scientists from the University of Arizona, University of Arkansas, and NCEI’s Paleoclimatology Program expect that the current snowpack low has a strong likelihood of occurring only once every 500 years and only once every 1,000 years below 7,000 feet. Such an exceptional low level poses significant challenges to California, which receives over 30% of its yearly water supply from Sierra Nevada snowpack.
Source: Multi-Century Evaluation of Sierra Nevada Snowpack | National Centers for Environmental Information (NCEI) formerly known as National Climatic Data Center (NCDC)​

Bob Wilson