SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-fog-ground-cloud

What is fog?

A cloud at ground level, made of tiny water droplets.

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  1. A ground-level cloud ✔
  2. A high ice cloud
  3. A wall of rain

Why: Fog is made of tiny liquid water droplets at or very near the surface. It reduces visibility because those droplets scatter light.

Huh, didn't know that: Pilots run into fog often, which is why it matters so much in flight weather.

The dad joke
Why did the cloud sit down? It was feeling foggy.
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References

Answer: A ground-level cloud. Fog is made of tiny liquid water droplets at or very near the surface. It reduces visibility because those droplets scatter light.

  1. Aerospace Dimensions Module 3, Air Environment akwg.cap.gov/media/cms/Module_3__Air_Environment_D8702BF7F9162_21bba.pdf
    fog - tiny droplets of liquid water at or near the surface of the land or water
    Checked 2026-10-10.

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