The West Coast is facing another year of extreme drought, and water managers are deciding where slim resources should go based on predictions from climate scientists. Andrew Schwartz is one of those scientists. He manages the Central Sierra Snow Laboratory for the University of California Berkeley. He says researchers across the West are using outdated models and measurements to predict the drought. The result is a poor understanding of the relationship between how much precipitation falls, and how much water is actually available to use. He joins us to share more about the details and implications of his work.