What does it mean to build “climate resilient” water supply and water resource systems? Answering that question convincingly requires properly understanding the nature of climate hazards and how they might affect water availability. The global climate system is complex: rainfall varies considerably across seasons, across regions, and (especially) across climate cycles (e.g. El Niño / La Niña). Understanding variability and the multiple influences on regional climate is essential to planning for extreme events. Today, teams of scientists from different countries are brought together by UC’s Santa Barbara’s Climate Hazards Center to make reliable drought forecasts for many parts of the world up to 8 months in advance. They do this by using estimated rainfall distributions over the entire planet at high spatial temporal resolution (think one-day or 5-day accumulations at 5 x 5 km grid resolution for the entire planet) going back over four decades and comparing them with robust estimates of sea surface temperatures (which are used to determine the strength climate oscillations like El Niño). In this episode of the REAL-Water podcast, we speak with CHC director Chris Funk about how to generate meaningful climate data products and forecast analysis, and just as importantly, how those resources are already being used to protect livelihoods.