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Fluctus

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Article Information
Category: Weather Weather
Content source: SKYbrary About SKYbrary
Content control: SKYbrary About SKYbrary
WX
Tag(s) Cloud Formations

Description

These supplemental features, now called Fluctus, are widely known as Kelvin-Helmholtz waves or Kelvin-Helmholtz instability. These features are caused by the winds above the cloud top blowing faster than the winds inside the cloud. This difference in speed (aka velocity shear) creates vortices, resulting in the top of the cloud being pulled upward into these wave forms.

Fluctus wave clouds forming over Mount Duval, NSW, Australia. Source:wikicommons (GRAHAMUK)

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