The Automated Surface Observing System (ASOS) program is an essential, joint mission support program consisting of the National Weather Service (NWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD).  The ASOS is the nation's primary system for collecting and reporting surface-weather observations, primarily at airports, in support of aviation operations as well as climatological data, weather forecasting, and the timely issuance of warnings. ASOS directly supports: 

1. Air Traffic Controllers relying on surface observations to provide airport weather parameters to safely support National Aerospace System (NAS) operations.
2. Surface-weather observations at airports required for dispatch of commercial aircraft.
3. Surface observations required to support Instrument Flight Rules (IFR) operations.
4. Surface observation data required by the Office of Operational Systems and used by the NWS to produce weather forecast models and products.
5. The aviation community and flying public by providing required dial-in services to surface-observation stations to obtain automated voice-weather reports.
6. The general public by providing up-to-date weather conditions via a dial-up service.
7. Forecasters across the country by providing detailed and timely surface conditions from ASOS sites around the nation.
8. The aviation community by providing Ground-to-Air (GTA) Radio broadcasts of automated voice weather reports.

Sensor components of the ASOS system are approaching the end of service life and require replacement to maintain the high reliability and continuity of operations required of this critical system. This solicitation is to procure a single system replacement for the existing dual-system Outside Air Temperature Sensor and Dew Point Temperature Sensor. The procured system will provide one reading that consists of the representative ambient Outside Air Temperature and Dew Point Temperature or the representative ambient Outside Air Temperature and Relative Humidity reading from which the Dew Point Temperature can be derived through other means. Both variants will consist of the necessary sensor(s), aspirated radiation shield and NEMA 6/6P (IP67) rated stainless steel Electronics Enclosure for power supply and communication requirements.

*****AMENDMENT 0001*****

Additional Documents provided for reivew. 

WS-STD-2    National Weather Service Standard Environment Criteria and Test Procedures

ASOS Modification Note75A    Installation of ASOS Dewpoint Sensor (Vaisala DTS1)

Automated Surface Observing System (ASOS) Temperature/Relative Humidity Sensor Specification are the requested requirementd in Appendix A of the SOW.