The Automated Surface Observing System

Bowling Green Lexington Bluegrass Field Louisville Bowman Field Louisville Intl Airport 

 [ KSDF ] [ KLOU ] [ KLEX ] [ KBWG ]

The ASOS program is a joint effort of the (NWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD). The ASOS systems serve as the nation's primary surface weather observing network. ASOS is designed to support weather forecast activities and aviation operations and, at the same time, support the needs of the meteorological, hydrological, and climatological research communities.

With the largest and most modern complement of weather sensors, ASOS significantly expands the information available to forecasters and the aviation community. The ASOS network more than doubles the number of full-time surface weather observing locations.  ASOS works non-stop, updating observations every minute, 24 hours a day, every day of the year.

ASOS detects significant changes in the atmosphere, collecting data every 5 minutes, and disseminates hourly and special observations via the NWS and FAA communications networks.  We're retrieving the 5-minute data, and are graphically displaying the observational components, with a 24-hour floating window of data available. is the U.S. government's official web portal to all federal, state and local government web resources and services.