---
title: "Cloud of operational significance — EASA Definition · Avioverse"
description: "Article 2, Regulation (EU) No 923/2012: ‘cloud of operational significance’ means a cloud with the height of cloud base below 1 500 m (5 000 ft) or below…"
url: "https://avioverse.aero/glossary/easa/cloud-of-operational-significance"
---

# cloud of operational significance

EASA defines “cloud of operational significance” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> ‘cloud of operational significance’ means a cloud with the height of cloud base below 1 500 m (5 000 ft) or below the highest minimum sector altitude, whichever is greater, or a cumulonimbus cloud or a towering cumulus cloud at any height;

Article 2 · Standardised European Rules of the Air (SERA) · Regulation (EU) No 923/2012 · Easy Access Rules, 26 Aug 2025 revision · [Read Article 2](https://avioverse.aero/regulations/easa/sera/cover-regulation/powers-and-recital#article-2)

## Defined in the same article

- [accuracy](https://avioverse.aero/glossary/easa/accuracy)
- [advisory airspace](https://avioverse.aero/glossary/easa/advisory-airspace)
- [advisory route](https://avioverse.aero/glossary/easa/advisory-route)
- [aerial work](https://avioverse.aero/glossary/easa/aerial-work)
- [aerobatic flight](https://avioverse.aero/glossary/easa/aerobatic-flight)
- [aerodrome](https://avioverse.aero/glossary/easa/aerodrome)
- [aerodrome control service](https://avioverse.aero/glossary/easa/aerodrome-control-service)
- [aerodrome control tower](https://avioverse.aero/glossary/easa/aerodrome-control-tower)