AWOS: Automated weather observing system. A suite of weather sensors of many different configurations either procured by the FAA or purchased by individuals, groups or airports that are required to meet FAA standards. AWSS — automatic weather sensor system — is functionally the same as ASOS.
Everything You Need to Know about AWOS and ASOS
Key Takeaways:
- AWOS (Automated Weather Observing System) and ASOS (Automated Surface Observing System) are both automated systems providing essential weather data for aviation, with AWOS offering various reporting levels and ASOS being a more sophisticated system designed for generating routine weather reports (METARs) and forecasts (TAFs).
- ASOS generally provides more comprehensive data than most AWOS levels, including the type and intensity of precipitation, thunderstorms, obstructions to visibility, wind shifts, and accumulated precipitation, using advanced sensors like laser ceilometers and time-averaged measurements.
- Both systems transmit continuous weather updates and are accessible in-flight or by telephone; however, official AWOS/ASOS reports legally supersede a pilot's visual assessment, and adherence to their reported conditions is mandatory for compliance with FAA regulations such as VFR flight minimums.
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