A low-level temperature inversion with high humidity usually means what?

Smooth air with fog, haze or low clouds trapped under the inversion.

  1. Strong afternoon thunderstorms
  2. Smooth air with fog, haze or low clouds ✔
  3. Gusty, turbulent wind near the ground

Why: In an inversion, air gets warmer as you go up, which acts like a lid. Air below stays smooth and stable, and high humidity lets fog, haze or low clouds form under that lid.

Huh, didn't know that: Surface inversions often form on clear, cool nights when the ground chills the air right above it.

The dad joke
Why are ghosts bad at hiding in haze? You can see right through them.
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Sources

  1. FAA Remote Pilot Study Guide (FAA-G-8082-22), Ch. 3b https://www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/remote_pilot_study_guide.pdf

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