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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:

  • Pilots must understand the critical distinctions between Automated Terminal Information Service (ATIS) and automated weather observation systems (ASOS/AWOS) for comprehensive flight planning.
  • ATIS provides vital operational information beyond just weather, such as runway closures and NOTAMs, and is often augmented by Air Traffic Control (ATC) for accuracy, making it indispensable for pilots.
  • ASOS and AWOS differ primarily in their reporting frequency, operators, and ability to report special observations (SPECI), with ASOS offering continuous updates and being managed by multiple agencies.
  • Pilots hold the ultimate responsibility (PIC) to consult all available weather resources, verify ATIS information, and prioritize safety, avoiding over-reliance on a single source or succumbing to "Get-There-Itis."
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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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