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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 automated systems providing basic meteorological data; ASOS offers continuous reporting and special observations (SPECI), while AWOS reports at 20-minute intervals.
  • The ATIS (Automatic Terminal Information Service) is a comprehensive broadcast, often compiled by ATC using ASOS/AWOS data, that includes not only weather but also crucial non-weather flight information such as runway closures and NOTAMs.
  • Pilots must always listen to the full ATIS for a complete operational picture and acknowledge its code, as relying solely on automated weather reports or "the numbers" is insufficient for safe flight planning and execution.
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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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