ASOS 5-Minute Weather Duration (DSI-6403) is digital data set DSI-6403, archived at the National Climatic Data Center (NCDC). ASOS is Automated Surface Observing System, which is used at several hundred National Weather Service (NWS), Federal Aviation Administration (FAA), and US military stations in the United States of America including Alaska and Hawaii, and Puerto Rico. The earliest data is ... from June, 1998. DSI-6403 contains a record of all weather events for the reporting site. Reporting sites include all ASOS stations across the US. The beginning and ending time of the weather event is also reported. Weather duration data are derived from DSI-6401, ASOS 5-Minute Data. Weather duration data are used as input to create a climatological product known as the Monthly Airways Extract (MAE), DSI-6407, for those sites. Major parameters include the type of weather event and its begin and end times.