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Clouds from which Altostratus may form


Altostratus may form:

  • By the thickening of a veil of Cirrostratus (As cirrostratomutatus)
  • Sometimes by the thinning of a layer of Nimbostratus (As nimbostratomutatus)
  • From an Altocumulus layer when widespread ice crystal virga falls from the latter (As altocumulogenitus)
  • Sometimes, particularly in the tropics, by the spreading out of the middle or upper part of Cumulonimbus (As cumulonimbogenitus)

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