In a warming climate, heat waves have become more and more frequent. However, there is no universal definition or clear understanding of the causes of heat waves. Yet, the impacts on society can be catastrophic from human and animal diseases and even deaths to crop failures resulting in famine and power outages. This joint session with the 33rd Conference on Climate Variability and Change (CVC) will bring together the international climate and health research communities, health practitioners, and decision makers, focusing on climate information and its applications to heat vulnerability, impacts, and adaptation. Oral and poster presentations are solicited on all topics related to heat waves world wide, that address improved understanding of the mechanism associated with heat waves and predictability at all time scales, hazards of heat waves on human and animal health, and early warning systems to mitigate the impacts of heat waves.