California’s reservoirs are filled by precipitation and the slow melting of the state’s snowpack. On April 1, 2015, the snowpack was at just 5% of average for the day. This year, ​satellite images show that the Sierra Nevada snowpack is visibly improved. After a stormy March, the water contained in the statewide snowpack is 87% of normal for March 30 – much better than a year ago, but still slightly below average.