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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:

  • The article differentiates between automated weather reporting systems (ASOS/AWOS), which provide raw weather data, and the ATIS (Automatic Terminal Information Service), an ATC-generated broadcast integrating weather with critical operational information.
  • ASOS and AWOS collect similar meteorological data but differ in update frequency (ASOS is continuous, AWOS is 20-minute intervals) and operating agencies, with their data forming the basis for METARs and ATIS.
  • ATIS is crucial for pilots as it combines automated weather observations with manually included, pertinent non-weather information (e.g., runway closures, NOTAMs), which ATC can augment for accuracy.
  • Pilots are emphasized as the final authority (PIC) and must use all available weather resources, listen to the complete ATIS, and avoid relying on partial information or "Get-There-Itis" to ensure flight safety.
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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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