- Altocumulus Castellanus and subsidence or large-scale sinking air
- W021875Z
- Subsidence. The effects of subsidence or large-scale sinking air are not easy to see just by looking at a static image of the sky. In this midday scene, slightly unstable Altocumulus Castellanus strips come under the influence of widespread subsidence, causing the bubbling elements to become flatter and smooth, similar to lenticular patches.
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