© Jarmo Koistinen

Savonlinna, Finland

Latitude: 61° 52' 8'' N

Longitude: 28° 53' 24'' E

27 July 2008 0644 (Local Time)
Camera direction: towards NW

Image P/S code: P.2.6

Image I.D.: 5103

C_L = 0, C_M = 0, C_H = 9

• Images & related info Other Images Images of 1987 edition
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  Cirrocumulus lenticularis lacunosus

  The image shows Cirrocumulus cloud at the zenith of the sky on an otherwise clear day. The cloud is a bright white without shading and is composed of small elements. It has an overall lens shape, indicative of the species lenticularis, with rather diffuse edges. The variety lacunosus with its fine-scale honeycomb structure can be seen in detail towards the top of the image. A sounding representative of the airstream suggests a cloud height of about 7 000 m.

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

  © Jarmo Koistinen
  Savonlinna, Finland
  Latitude: 61° 52' 8'' N
  Longitude: 28° 53' 24'' E
  27 July 2008 0644 (Local Time)
  
  
  Camera direction: towards NW
  C_L = 0, C_M = 0, C_H = 9
  Image P/S code: P.2.6
  Image I.D.: 5103
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  Cirrocumulus lenticularis lacunosus

  This zoomed-in image is of a section of Cirrocumulus cloud. It illustrates the typical structure of the variety lacunosus, with more or less regularly distributed round holes like a net or honeycomb.

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

  © Jarmo Koistinen
  Savonlinna, Finland
  Latitude: 61° 52' 14'' N
  Longitude: 28° 53' 28'' E
  27 July 2008 0645 (Local Time)
  
  
  Camera direction: towards NW
  C_L = 0, C_M = 0, C_H = 9
  Image P/S code: P.2.6
  Image I.D.: 5104
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  Low pressure of 993 hPa was present over the North Atlantic, with an anticyclone of 1028 hPa over northern Scandinavia. The photo was taken on the eastern flank of the anticyclone. A northerly flow was present in the upper atmosphere.

  © Deutscher Wetterdienst
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  Irisation in Cirrocumulus lacunosus

  The colours appearing in this Cirrocumulus cloud are due to irisation. Near to the Sun, irisation results when light waves are diffracted by very small, uniformly sized cloud particles. Beyond about 10° from the Sun, the interference of light waves is usually the dominant factor. Green and pink are the colours that typically predominate, although some blue is also visible here.

  Note that the photograph has been deliberately underexposed in order to adequately record the delicate, pastel shades of colour. In reality, the scene here would be very bright – hence why the photographer has mostly blocked the intense direct sunlight with the roof of the building. Cirrocumulus is a white cloud without shading. The small holes at 6 and 7 indicate the cloud variety lacunosus.

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  © Claudia Hinz
  Mt. Wendelstein, Bavarian Alps, Germany
  Latitude: 47° 42' 10'' N
  Longitude: 12° 0' 44'' E
  20 September 2007 1442 (Local Time)
  
  
  Camera direction: towards SW
  C_L = 0, C_M = 0, C_H = 9
  Image P/S code: S.13.3 4
  Image I.D.: 5625
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  Cirrocumulus with undulatus and lacunosus

  The image shows mainly Cirrocumulus cloud, identified by its very small elements with an apparent width of less than 1°. Two varieties can be seen: the undulations identify the variety undulatus, while the well-defined small holes that look like a net identify the variety lacunosus. To the lower right is the edge of a sheet of Cirrocumulus stratiformis, while to the left is some Cirrus fibratus.

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  © Martin Gudd
  Bad Kreuznach, Germany
  Latitude: 49° 50' 39'' N
  Longitude: 7° 50' 32'' E
  07 December 2015 1424 (Local Time)
  
  
  Camera direction: towards SE
  C_L = 0, C_M = 0, C_H = 9
  Image P/S code: S.2.6 1
  Image I.D.: 5095
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  Cirrocumulus stratiformis lacunosus

  This extensive cloud sheet belongs, on account of its fineness and whiteness, to the genus Cirrocumulus. Small rounded elements without shading at 1, 2 and ripples at 3, 4 are visible almost everywhere. The lacunosus structure is evident from the numerous holes at 5, 6. As often occurs in Cirrocumulus, some Cirrus fibratus is merged with the patches. This sky was associated with an old cold front which passed over the area slowly from the north-east. The front caused a temporary increase of cloudiness but no precipitation.

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  © A.J. Aalders
  Amsterdam, Netherlands
  Latitude: 52° 22' 13'' N
  Longitude: 4° 53' 43'' E
  19 May 1952 1220 (Local Time)
  
  
  Camera direction: towards SW
  C_L = 0, C_M = 0, C_H = 9