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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:

  • Automated Surface Observing Systems (ASOS) and Automated Weather Observing Systems (AWOS) are airport-based equipment providing basic weather data, with ASOS offering continuous reporting and broader operational control compared to the FAA-controlled AWOS.
  • The Automatic Terminal Information Service (ATIS) is a crucial ATC broadcast that combines ASOS/AWOS weather data with vital non-weather flight information, such as active runways, NOTAMs, and taxiway closures.
  • Pilots must listen to the ATIS for comprehensive and augmented information, rather than solely relying on automated weather sources, as it provides critical details necessary for safe flight operations.
  • The Pilot In Command (PIC) is the final authority and must utilize all available weather resources and prioritize safety, refraining from pressuring ATC to modify weather reports to meet personal operational minimums.
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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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