Aviation English
Meteorology

What is cloud base?

cloud base Lowest altitude of the visible cloud layer, reported as base of scattered, broken, overcast.

Source: ICAO Doc 9432, FAA PCG

How is “cloud base” Used in Practice?

We observe cloud base at approximately fifteen hundred feet and request descent clearance.

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

Related Aviation English Terms

ceilingtowering cumulus cloudaltocumulus castellanus cloudvisibility

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Frequently Asked Questions

What is cloud base?

Lowest altitude of the visible cloud layer, reported as base of scattered, broken, overcast.

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