early warning system 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
smog warningAction, device or announcement that serves to give caution or notice to the level of air pollutants typically associated with oxidants in a given area
warning plan A scheme or method of acting developed in advance to notify as quickly as possible the affected population of any sudden, urgent and usually unexpected occurrence requiring immediate action
warning system Any series of procedures and devices designed to detect sudden or potential threats to persons, property or the environment, often utilizing radar technology