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Ceiling (cloud)

In today's world, Ceiling (cloud) is a topic that continues to generate interest and debate. Over the years, Ceiling (cloud) has been the subject of study and research, leading to greater knowledge and understanding of its different aspects. Whether in the scientific, social, economic or cultural fields, Ceiling (cloud) has proven to have a significant impact on society and people's lives. In this article, we will explore in depth the various dimensions of Ceiling (cloud), analyzing its importance and possible implications for the future.

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Not to be confused with Cloud top.

In aviation, ceiling is a measurement of the height of the base of the lowest clouds (not to be confused with cloud base which has a specific definition) that cover more than half of the sky (more than 4 oktas) relative to the ground. Ceiling is not specifically reported as part of the METAR (METeorological Aviation Report) used for flight planning by pilots worldwide, but can be deduced from the lowest height with broken (BKN) or overcast (OVC) reported.[1] A ceiling listed as "unlimited" means either that the sky is mostly free of cloud cover, or that the clouds are high enough not to impede visual flight rules (VFR) operation.

Definitions

ICAO
The height above the ground or water of the base of the lowest level of cloud below 6 000 metres (20 000 feet) covering more than half the sky.[2]
Canada
A ceiling is the lesser of the following: the height above ground or water of the base of the lowest layer of cloud covering more than half of the sky, or the vertical visibility in a surface-based layer which completely obscures the whole sky. Therefore, a ceiling exists at the height of the first layer for which a coverage symbol of BKN or OVC is reported. The existence of a vertical visibility constitutes an obscured ceiling.[3]
EASA States
The height above the ground or water of the base of the lowest layer of cloud below 6 000 m (20 000 ft) covering more than half the sky.[4]
United Kingdom
The height above the ground or water of the base of the lowest layer of cloud below 6000 m (20000 ft) covering more than half the sky.[5]
United States
The height above the Earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as broken, overcast, or obscuration, and not classified as thin or partial.[6]

See also

References

  1. ^ METAR
  2. ^ ICAO Annex 2, ch. 1.
  3. ^ Transport Canada Aeronautical Information Manual: Meteorology, para 8.2.
  4. ^ European Standardised Rules of the Air Regulation, art 2(50).
  5. ^ UK Standardised Rules of the Air Regulation, art 2(50).
  6. ^ Section 1.1 14 CFR Part 1 - Definitions - Federal Air Regulations
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