Improving short- and long-term predictive power and forecasting of climate hazards is an urgent challenge, as is quantitatively connecting those predictions to health impacts. This session will explore advances in the data and models that underlie predictive models and climate projections, as well as efforts to strengthen the quality and reach of climate hazard early warning systems and projections on all timescales (from day-to-day to end-of-century), for health impacts ranging from vector-borne disease outbreaks to heat waves.