Any series of procedures and devices designed to detect sudden or potential threats to persons, property or the environment at the first sign of danger; especially a system utilizing radar technology. (Source: GEMET/RHW)

Early warning systems provide timely and actionable warnings that protect the population against the immediate threat and consequences of natural or man-made disasters (in particular of extreme climate events such as heat waves, forest fires, floods and droughts). ( draft based on CLIM-WARN)