With climate change unfolding more rapidly than model projections for extreme events, new and emerging compound hazards are likely. The characteristics of such events are not well understood because the historical record is limited. For example, climate change is expanding the impacts of tropical cyclones to the midlatitudes. High-impact ex-hurricanes have hit the United States, Canada, and Western Europe, causing loss of life and severe damage. Do such events signal emerging climate risk worldwide? Another example is the rapid transition to ice-free conditions across the Arctic, driving unprecedented conditions for the development of extreme weather events across the midlatitudes. Which processes govern risk and impacts? We seek contributions to theoretical and hypothesis-driven research on new and emerging compound extremes, including analysis of observational datasets, operational product, and weather/climate simulations. Particularly welcome are case studies of unusual cyclogenesis or pathways of extremes, studies of interactions with large-scale drivers, and storyline analyses.