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ATIS vs. AWOS vs. ASOS

Pilots always listen to the ATIS, right? And how does ATC get that information it records for the ATIS. And while we’re at it, how do AWOS and ASOS differ?

Gemini Sparkle

Key Takeaways:

  • ASOS (Automated Surface Observing System) and AWOS (Automated Weather Observing System) are airport-based systems that provide basic weather data, with ASOS offering more continuous reporting and special observations (SPECI).
  • ATIS (Automatic Terminal Information Service) is a recording compiled by ATC, which includes ASOS/AWOS weather data but crucially adds vital non-weather-related information such as active runways, NOTAMs, and taxiway closures.
  • Pilots must listen to the full ATIS broadcast for comprehensive, real-time airport information, as solely relying on automated weather reports or "having the numbers" from other sources is insufficient and potentially unsafe.
  • It is imperative for pilots to utilize all available weather resources for thorough pre-flight planning and in-flight decision-making, acknowledging that the Pilot In Command (PIC) is the final authority for safe operations.
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When pilots start learning how to fly, they are taught all the basics. When it comes to weather, they are taught to listen to the ATIS, learn to read prog charts, winds aloft, etc. All weather planning can be critical to conducting a flight, especially cross country, but where does it come from? There’s weather.gov, 1800-WXBRIEF, NOAA, etc. Okay, those are the services, but each service has a focal point. Here, let’s discuss the most basic piece of weather equipment at most airfields in the U.S.—almost all of us have flown into fields with weather-reporting equipment, like an ASOS or AWOS. Do you know the difference?

Do you know what happens to that data? If there is a phone number at a field for the ASOS/AWOS, do I still need to listen to the actual ATIS? The ATIS is just the weather read out loud, right? Let’s not forget that ATIS has pertinent information that is NOT weather related, yet pertinent to your flight, so that’s an easy “Yes, you should still listen to the ATIS before you taxi out, or well before you arrive at your destination.” 

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