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 Observation Systems) provide crucial automated weather data for aviation, with ASOS being generally more sophisticated and providing continuous observations for METARs and TAFs.
- AWOS offers various reporting levels, from basic altimeter settings to full precipitation, thunderstorm, and runway condition data, while ASOS typically provides AWOS-3 level data with advanced capabilities like precipitation type/intensity, wind shifts, and accumulated precipitation.
- Both systems transmit detailed weather messages, accessible in flight via radio frequency or on the ground by telephone, with observation limits of 12,000 feet for cloud height and 10 miles for visibility.
- Official automated weather reports from AWOS/ASOS are legally binding for flight regulations (e.g., VFR minimums) and cannot be superseded by a pilot's personal observation.
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