© George Anderson

Wokingham, England, United Kingdom of Great Britain and Northern Ireland

Latitude: 51° 25' 36'' N

Longitude: 0° 49' 26'' W

31 August 2014 0850 (Local Time)
Camera direction: towards SE

Image P/S code: P.4.7

Image I.D.: 5172

C_L = 0, C_M = 3, C_H = /

• Images & related info Other Images Images of 1987 edition
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  Altocumulus stratiformis translucidus perlucidus undulatus

  This layer of medium-level cloud is Altocumulus. Its rounded masses and rolls have an apparent width of between 1° and 5° and there is some shading. The specific species of this Altocumulus is classified as stratiformis, due to the cloud’s extensive coverage of the sky. The sheet of cloud is sufficiently translucent to reveal the position of the Sun, and so it is also of the variety translucidus. In places there are spaces between the cloud elements, which also indicates the variety perlucidus, and the enlongated and broadly parallel rolls indicate that the variety undulatus also applies.  

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  © George Anderson
  Wokingham, England, United Kingdom of Great Britain and Northern Ireland
  Latitude: 51° 25' 36'' N
  Longitude: 0° 49' 26'' W
  31 August 2014 0850 (Local Time)
  
  
  Camera direction: towards SE
  C_L = 0, C_M = 3, C_H = /
  Image P/S code: P.4.7
  Image I.D.: 5172
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  A ridge of high pressure extended over England, UK, with a series of fronts to the west of the British Isles.
  © Crown Copyright
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  The band of Altocumulus can be seen in this image stretching across central southern England, UK.

  © EUMETSAT, 2013
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  Altocumulus stratiformis undulatus translucidus perlucidus

  This layer of Altocumulus (species stratiformis) is clearly translucent (variety translucidus) and gaps between the elements permit the sky to be seen (variety perlucidus)(2). The elongated elements, almost parallel to one another indicate the variety undulatus(4). The layer was invading the sky.

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  © Albert Reynolds
  Robertson, South Africa
  Latitude: 33° 47' 44'' S
  Longitude: 19° 52' 2'' E
  22 May 2014 1412 (Local Time)
  
  
  Camera direction: towards N
  C_L = 0, C_M = 5, C_H = 0
  Image P/S code: S.4.11
  Image I.D.: 4735
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  Altocumulus stratiformis translucidus perlucidus, Cirrus spissatus and Stratocumulus cumulogenitus

  A thin sheet of almost-white Altocumulus stratiformis translucidus perlucidus dominates this image. A wave pattern (variety undulatus) is developing on the eastern edge of the sheet.

  Lower down are a few Cumulus congestus cells; a  shower of rain is falling from one of them. Cumulus mediocris cells sheared by the low-level winds are also present.

  Patches of Stratocumulus are the remnants of the tops of the Cumulus that spread under a stable layer (cumulogenitus). More Stratocumulus cumulogenitus is forming in several areas.

  Lastly, several patches of Cirrus spissatus are further east of the Altocumulus. Nothing suggests these thick patches of Cirrus are the remnants of Cumulonimbus tops.

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  © Phoebe Dill
  St.George's, Bermuda
  Latitude: 32° 21' 50'' N
  Longitude: 64° 39' 6'' W
  10 September 2015 1301 (Local Time)
  
  
  Camera direction: towards E
  C_L = 4, C_M = 3, C_H = 2
  Image P/S code: S.4.7 1
  Image I.D.: 4739
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  Altocumulus stratiformis translucidus perlucidus at night with a lunar corona

  In this night-time image, the thin layer of medium-level cloud through which the moon is visible is Altocumulus stratiformis translucidus. On the left edge, there are gaps between the cloud elements, making this also the variety perlucidus. The optical phenomenon surrounding the moon is the aureole of a lunar corona. 

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  © Sigbjørn Underbakke
  Norway
  Latitude: 59° 29' 31'' N
  Longitude: 6° 30' 57'' E
  27 September 2015 2247 (Local Time)
  
  
  Camera direction: towards S
  C_L = 0, C_M = 3, C_H = 0
  Image P/S code: S.13.2.2 17
  Image I.D.: 4764
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  A very thin, low and dissolving sheet of Altocumulus stratiformis translucidus perlucidus

  This is an extensive sheet (variety stratiformis) of light grey Altocumulus in the form of elements. The size of the elements is just less than the width of 3 fingers at arm's length (this measurement is applicable to those elements observed at an angle of more than 30° above the horizon); this confirms the identification of Altocumulus, but also suggests that the layer is in the lower end of the height range for middle-level cloud. The elements are all sufficiently thin to reveal the position of the Sun (variety translucidus) and are separated by distinct, small spaces of clear air (variety perlucidus). 

  The sheet has started to dissolve; this process is revealing a patch of Cirrus toward the horizon. 

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  © Stefan Kämpfe
  Andreasvorstadt, Erfurt, Germany
  Latitude: 51° 0' 0'' N
  Longitude: 11° 0' 0'' E
  29 October 2011 0800 (Local Time)
  
  
  Camera direction: towards NE
  C_L = 0, C_M = 3, C_H = 1
  Image P/S code: S.4.7 2
  Image I.D.: 5647