© Tze Ching Ho

Benxi, Liaoning, China

Latitude: 41° 29' 32'' N

Longitude: 123° 41' 23'' E

29 September 2015 1635 (Local Time)

Image P/S code: P.4.11

Image I.D.: 5642

C_L = 0, C_M = 5, C_H = 2

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

  This is an excellent example of a thin (variety translucidus) sheet (species stratiformis) of invading Altocumulus where the long rolls of merged elements (variety undulatus) are merging into a thick layer upwind.

  Through the small gaps (variety perlucidus), thick patches of Cirrus (species spissatus) are visible.

  A nearby upper-air sounding confirmed a relatively high Altocumulus base of 5 500 m (18 000 ft).

  Links in the image description will highlight features on the image. Mouse over the features for more detail.

  © Tze Ching Ho
  Benxi, Liaoning, China
  Latitude: 41° 29' 32'' N
  Longitude: 123° 41' 23'' E
  29 September 2015 1635 (Local Time)
  
  
  C_L = 0, C_M = 5, C_H = 2
  Image P/S code: P.4.11
  Image I.D.: 5642
• 
  The sounding is from 41 km north-north-west and 2.5 hours later. There is 98 %RH from 516 to 416 hPa (5 551 to 7 170 m) and high humidity from 333 to 295 hPa (8 785 to 9 635 m).
  © University of Wyoming
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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.

  Links in the image description will highlight features on the image. Mouse over the features for more detail.

  © 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 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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  Altocumulus stratiformis undulatus perlucidus from the air

  The photo shows a layer of Altocumulus stratiformis undulatus perlucidus, viewed from an aircraft at an altitude of approximately 1 1000 m over the Italian Alps. At the lower right of the picture, some Cumulus clouds can be seen over the mountains.

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  © George Anderson
  Province of Trento, Italy
  Latitude: 45° 45' 17'' N
  Longitude: 10° 52' 13'' E
  02 September 2013 1749 (Local Time)
  
  
  Camera direction: towards N
  C_L = 0, C_M = 3, C_H = /
  Image P/S code: P.20.4.11
  Image I.D.: 5193
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  Altocumulus stratiformis perlucidus undulatus

  The cloud layer is made up for the most part of fairly large rolls (1 - 2, 3 - 4), roughly rectilinear and parallel. Clear sky is visible between the rolls (variety perlucidus). The clouds were progressively invading the sky. The photograph was taken in a maritime polar air mass between a cold front and an occlusion, both of thundery character.

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  © A. Viaut
  Saint-Palais-sur-Mer, France
  Latitude: 45° 38' 34'' N
  Longitude: 1° 5' 9'' W
  22 July 1950 1108 (Local Time)
  
  
  Camera direction: towards NNE
  C_L = 0, C_M = 5, C_H = 0