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SESK: Stuff Everyone Should Know · sesk.info/ifr-unforecast-weather

In IFR controlled airspace, which of these must you report without being asked?

Unforecast weather you encounter.

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  1. Your groundspeed every 10 minutes
  2. Every VOR passage under radar control
  3. Any unforecast weather conditions encountered ✔

Why: 91.183 requires you to report unforecast weather and other information relating to the safety of flight. It also requires position reports at designated reporting points, but under radar control only those ATC requests.

Huh, didn't know that: The rule says these reports must be made as soon as possible, while keeping a continuous watch on the right frequency.

The dad joke
Approach: "Citation 123, please give a cloud description on your descent." Citation: "They're white."
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References

Answer: Any unforecast weather conditions encountered. 91.183 requires you to report unforecast weather and other information relating to the safety of flight. It also requires position reports at designated reporting points, but under radar control only those ATC requests.

  1. 14 CFR 91.183 IFR radio communications www.law.cornell.edu/cfr/text/14/91.183
    Any unforecast weather conditions encountered; and
    Checked 2026-10-10.

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