AWOS Siting Criteria

Welcome to our simple guide on AWOS siting criteria for Non-Fed AWOS.

Whether you're an airport manager, aviation engineer, or an AWOS Technician, understanding the proper siting of Automated Weather Observing Systems (AWOS) is crucial for accurate weather data and aviation safety. Our guidelines, derived from FAA Order JO 6560.20C, provide general recommendations to ensure optimal placement and performance of AWOS sensors. By following these criteria, you can minimize interference and maximize the reliability of weather observations at your facility.

Avoid Costly Mistakes! Do Not modify your AWOS without consulting a Non-federal Program Liaison.

Simplified Siting Guide

1. Runway Proximity: Place primary sensors (cloud height, visibility, wind) 1,000 to 3,000 feet from runway threshold and 500 to 1,000 feet from centerline. For precision runways without RVR, use 750 to 1,000 feet from centerline.

2. Elevation Adjustment: Adjust distance based on elevation difference (7 feet per foot of elevation change).

3. Visibility Sensor: 10 ± 2 feet above ground, avoid obstructions within 50 feet, and clear area for 300 feet forward for backscatter types.

4. Wind Sensor: 30 to 33 feet above ground, aligned with true North, maintain obstruction-free zones within 500 feet (15 feet lower) and 1000 feet (10 feet lower).

5. Temperature and Humidity Sensors: 5 ± 1 foot above ground, well-ventilated, away from buildings and artificial heat sources.

6. Precipitation Sensors: 1.5 to 5 feet above ground, avoid dust and transient conditions.

7. Lightning Sensor: Avoid metal obstructions closer than twice their height above the sensor.

By following these simplified guidelines, you ensure accurate and reliable placement of AWOS sensors, minimizing interference and maximizing the representativeness of the data. However, this is not a conprehensive guide and siting must be approved by the FAA. For more detailed information and specific requirements, refer to the FAA Order JO 6560.20C.