Cirrocumulus clouds time lapse

Cirrocumulus are a relatively rare cloud forming ripples which may resemble honeycomb or the scales of fish, giving rise to the phrase 'mackerel skies'. Timelapse from 1st September 2018.
Height of base: 20,000 - 40,000 ft

How do cirrocumulus clouds form?
Cirrocumulus cloudlets are usually made up of both ice and 'supercooled' water, this means that water remains a liquid, even at temperatures well below 0oC. They form when turbulent vertical currents meet a cirrus layer, creating the puffy cumulus shape.

Cirrocumulus clouds can also form through contrails, the vapour trails left by planes as they fly through a dry upper troposphere. These streaks can spread out and become cirrus, cirrostratus and cirrocumulus.