Cumulonimbus velum

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Velum near the top of a cumulonimbus

Cumulonimbus velum (Cb vel) (from the Latin cumulonimbus, "column-rain" + velum, "veil") is a cumulonimbus cloud with a small layer of altostratus cloud wrapped around its mid area, representing an area of humid stable air created as a result of the growth of the parent cumulonimbus.[1] The altostratus velum cloud appears dark in comparison to its parent cloud, and can persist even after the cumulonimbus has disintegrated. The velum is very rare.

References

  1. ^ "Velum". Meteorological glossary. American Meteorological Society. Retrieved May 2, 2014.
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