The Automated Surface Observing System (ASOS) automatically collects weather data and provides accurate weather reports to local weather observers, weather forecasters, and airport personnel, including pilots and air traffic controllers. ASOS functions include measurements of weather elements, data processing, and displaying of weather data, communications, and data storage. The ASOS automatically collects, processes, error checks and formats data, displays, stores, and reports weather elements included in a surface weather observation. ASOS also accepts input from operators who may override or add information to the automatically generated observation, including the METAR and SPECI observations.