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 System) are both automated weather systems, with AWOS offering various levels of capability (from altimeter only to full sensors) and ASOS being more comprehensive, designed for METARs, TAFs, and detailed precipitation/obstruction data.
- Both systems provide continuous weather reports (AWOS updated each minute, ASOS hourly/special) accessible in-flight or by telephone, with common reporting limits of 12,000 feet for cloud height and 10 miles for visibility.
- Official weather reports from AWOS/ASOS are legally binding for flight rules (e.g., VFR minimums) and cannot be superseded by a pilot's personal visual assessment, as clarified by FAA legal interpretation.
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