Cumulonimbus capillatus

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Cumulonimbus capillatus
AbbreviationCb cap.
Symbol
AltitudeGround to 23,000 m
(75,000 ft)
AppearanceDark-based storm cloud capable of impressive vertical growth, with a fibrous upper portion
PrecipitationVery often rain, snow, snow pellets, or hail; heavy at times

A cumulonimbus capillatus is a cumulonimbus cloud with dense cirrus clouds above it, making the cloud top appear to contain hair-like structures. The name comes from the Latin word capillatus, meaning "with hair".[1]

It is an intermediate stage between cumulonimbus calvus and cumulonimbus incus.

Hazards

[edit]

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;[2] 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.
  • Weak to strong tornados can occur.
[edit]

References

[edit]
  1. ^ "capillatus". Oxford Reference. Oxford University Press. Retrieved 2021-10-18.
  2. ^ "Cumulonimbus clouds". Met Office. Retrieved 2025-10-22.


    Cumulonimbus capillatus
    AbbreviationCb cap.
    Symbol
    AltitudeGround to 23,000 m
    (75,000 ft)
    AppearanceDark-based storm cloud capable of impressive vertical growth, with a fibrous upper portion
    PrecipitationVery often rain, snow, snow pellets, or hail; heavy at times

    A cumulonimbus capillatus is a cumulonimbus cloud with dense cirrus clouds above it, making the cloud top appear to contain hair-like structures. The name comes from the Latin word capillatus, meaning "with hair".[1]

    It is an intermediate stage between cumulonimbus calvus and cumulonimbus incus.

    Hazards

    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;[2] 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.
    • Weak to strong tornados can occur.

    References

    1. ^ "capillatus". Oxford Reference. Oxford University Press. Retrieved 2021-10-18.
    2. ^ "Cumulonimbus clouds". Met Office. Retrieved 2025-10-22.


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