Weather theoryQuestion 335 of 934

Which conditions favor the formation of radiation fog?

  1. Cloudy nights with strong wind
  2. Warm air moving over a cold sea
  3. Clear nights with little or no wind
  4. Cold, dry air moving over warm water
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Correct answer: Clear nights with little or no wind

The ground cools rapidly by radiation. The air then reaches its dew point.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12: Weather Theory — Fog, page 299

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Questions last reviewed: 18 October 2026