© Michael Bruhn

Aspendale Gardens, Victoria, Australia

Latitude: 38° 1' 33'' S

Longitude: 145° 6' 55'' E

19 March 2015 1548 (Local Time)
Camera direction: towards SW

Image P/S code: P.10.15

Image I.D.: 5959

C_L = 9, C_M = 8, C_H = /

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  Cumulonimbus altocumulogenitus with praecipitatio

  This photograph shows the characteristic dark underside of a Cumulonimbus cloud. The cloud base had an estimated height of 3 00 m (9 000 ft), which is within the middle level. This is unusually high – the result of the Cumulonimbus developing from Altocumulus castellanus. On account of its origin, this is Cumulonimbus altocumulogenitus. A precipitation shaft is visible in the distance.

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  © Michael Bruhn
  Aspendale Gardens, Victoria, Australia
  Latitude: 38° 1' 33'' S
  Longitude: 145° 6' 55'' E
  19 March 2015 1548 (Local Time)
  
  
  Camera direction: towards SW
  C_L = 9, C_M = 8, C_H = /
  Image P/S code: P.10.15
  Image I.D.: 5959
• 

  At 1500 hours local time, close to the time of the image, a trough line was present near the location (shown by the red arrow). A cold front was approaching from the west.

  © Commonwealth of Australia 2015, Bureau of Meteorology
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  The sounding from Melbourne Airport, Victoria, Australia (WMO 94866), taken earlier in the day, shows a very dry lower atmosphere. Between 700 and 500 hPa, some moisture is present. Above 700 hPa, the atmosphere is unstable, favouring medium-level convective development.

  © University of Wyoming