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Weather theoryQuestion 337 of 934

What is a feature of high clouds, such as cirrus?

  1. They are ice crystal clouds with no real threat of turbulence or icing
  2. They contain large amounts of supercooled water and cause severe icing
  3. They always bring thunderstorms to the area below them
  4. They form only in unstable air and cause severe turbulence
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Correct answer: They are ice crystal clouds with no real threat of turbulence or icing

High clouds form above 20,000 feet AGL, usually in stable air.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12: Weather Theory — Clouds, page 300

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Questions last reviewed: 18 October 2026