Cumulonimbus capillatus

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Cumulonimbus capillatus
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Cumulonimbus Capillatus
AbbreviationCb cap.
GenusCumulonimbus (heap, cloud/severe rain)
SpeciesCapillatus (fiborous)
ClassificationFamily D (Vertically developed)
AppearanceLarge cloud with fiborous, hair-like cirriform anvil top
Precipitation cloud?Yes, often intense

A Cumulonimbus capillatus (Latin Capillatus, "hair") is a cumulonimbus cloud with dense cirrus clouds which makes the cloud's top appear to contain hair-like structures. It is an intermediate stage between cumulonimbus calvus and cumulonimbus incus.


A Cumulonimbus Capillatus is a mature and powerful cumulonimbus cloud and can produce multiple severe weather.

  • Lightning; this is a strong thunderstorm cloud and it is capable of producing bursts of cloud to ground and cloud to cloud lightning.
  • Hail; hailstones may fall from this cloud if it is in a highly unstable environment (which favors a more vigorous storm updraft).
  • Heavy rain; the cloud may drop several inches of rain in a short amount of time. This can cause flash flooding.
  • Strong wind; gale-force winds from a downburst may occur under this cloud.