Aviation English
Meteorology

What is altocumulus castellanus cloud?

altocumulus castellanus cloud Medium-level turreted cloud with rising towers indicating mid‑level instability, possible precursor to thunderstorms.

Source: ICAO Doc 9432, FAA PCG

How is “altocumulus castellanus cloud” Used in Practice?

We observe altocumulus castellanus cloud at 12 o’clock six miles, requesting heading change to avoid build‑up.

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

towering cumulus cloudceilingwind shearcloud base

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Frequently Asked Questions

What is altocumulus castellanus cloud?

Medium-level turreted cloud with rising towers indicating mid‑level instability, possible precursor to thunderstorms.

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