Health early warning systems are changing. The scope of hazards is widening, data from an increasing range of sources are being incorporated, time scales are lengthening, and warning system skills are increasing. There is an increasing need to share information across disciplines and sectors about how systems are developed, implemented, and improved over time; about their costs and benefits; and regarding best practices in modeling, implementation, and communications. Presentations describing early warning system innovations are encouraged, as well as those addressing questions of early warning systems best practices, implementation indicators, costs and benefits, inclusion of novel data streams, and intersectoral partnerships. Systems need not focus directly on health impacts but can instead focus on warning of hazards that pose risks to health.