© Petter Hjulstad

Inderøy, Norway

Latitude: 63° 52' 46'' N

Longitude: 11° 13' 41'' E

11 August 2015 1825 (Local Time)
Camera direction: towards SW

Image P/S code: P.10.7

Image I.D.: 5050

C_L = 9, C_M = 2, C_H = /

• Images & related info Other Images Images of 1987 edition
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  Cumulonimbus with arcus

  Cumulonimbus clouds are heavy, dense clouds of considerable vertical extent in the form of a mountain or huge towers. The underneath of the cloud is often very dark. The supplementary feature arcus is of most interest in this image. Arcus is a dense, horizontal roll on the lower front part of the cloud that, when extensive, has the appearance of a dark, menacing arch. The leading edge may have a smooth appearance, but with more or less tattered edges. In this photograph, the underneath is ragged. Arcus is formed by strong downdraughts of cold air, which spread out ahead of the storm cloud. Also visible in the distance is the supplementary feature praecipitatio in the form of a shower. There is a thick layer of Altostratus opacus cumulonimbogenitus overhead. 

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

  © Petter Hjulstad
  Inderøy, Norway
  Latitude: 63° 52' 46'' N
  Longitude: 11° 13' 41'' E
  11 August 2015 1825 (Local Time)
  
  
  Camera direction: towards SW
  C_L = 9, C_M = 2, C_H = /
  Image P/S code: P.10.7
  Image I.D.: 5050
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  An occluded front was approaching Inderøy, Norway from the south-west.
  © Crown Copyright
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  Sounding from 90 km west-south-west – conditionally unstable low levels, very moist mid levels
  © University of Wyoming
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  A line of Cumulonimbus cells are seen offshore to the south-west of Inderøy, Norway. The line passed over Inderøy and dissipated in the following three hours.
  © EUMETSAT, 2014
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  Cumulonimbus with arcus

  The dominant feature in this image is the supplementary feature arcus, commonly known as a shelf cloud, advancing on the forward edge of a Cumulonimbus and thunderstorm.

  Cumulonimbus clouds are heavy, dense and of considerable vertical extent in the form of a mountain or huge towers. The underneath of the cloud is often very dark. The arcus is a dense horizontal roll on the lower front part of the cloud and having, when extensive, the appearance of a dark, menacing arch. The leading edge may have a smooth appearance but with more or less tattered edges. Arcus is formed by strong downdraughts of cold air, which spread out ahead of the storm cloud.

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

  © Shelby E. Fuller
  Millersville, Pennsylvania, United States of America
  Latitude: 39° 59' 43'' N
  Longitude: 76° 21' 14'' W
  26 March 2015 1857 (Local Time)
  
  
  Camera direction: towards NW
  C_L = 9, C_M = /, C_H = /
  Image P/S code: S.10.7
  Image I.D.: 6058
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  Cumulonimbus with arcus and praecipitatio

  Cumulonimbus clouds are heavy, dense and of considerable vertical extent in the form of a mountain or huge towers.

  The supplementary feature arcus is the dominant feature in this picture. Arcus is a dense horizontal roll on the lower front part of the cloud and having, when extensive, the appearance of a dark, menacing arch. The leading edge may have a smooth appearance but with more or less tattered edges, and the underside is often ragged. Arcus is formed by strong downdraughts of cold air, which spread out ahead of the storm cloud.

  Also visible in this picture is the supplementary feature praecipitatio in the form of a shower.

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

  © Amy Chan
  Chek Lap Kok, Hong Kong, China
  Latitude: 22° 18' 18'' N
  Longitude: 113° 53' 52'' E
  24 August 2011 1821 (Local Time)
  
  
  C_L = 9, C_M = /, C_H = /
  Image P/S code: S.10.7
  Image I.D.: 6060