The state of California is now officially drier than it's been in hundreds of years. A multi-century evaluation of the Sierra Nevada snowpack saw to that this week. Since the year 2012 a record-setting drought has been worsening in California. It's bad. It's so bad, as this evaluation reminds us, that the state recently enacted its first ever state-wide mandatory restriction of water use by the public. A team of researchers shows this week that the 2015 low in snow water equivalent (SWE) in the Sierra Nevada mountains is "unprecedented in the context of the past 500 years."