A high-level cloud type.
A cirrostratus cloud is a high-level cloud, typically found above 20,000 feet in the atmosphere. It consists of thin sheets of ice crystals that cover large portions of the sky and can often produce halo phenomena like a sun or moon halo.
Cirrus clouds are thin wispy clouds. They are over 6 kilometers up. It is freezing up there, so they are made of ice crystals. They can mean bad weather is on the way.
Cirrus, cirrostratus, and cirrocumulus are all types of high-level clouds. Cirrus clouds are wispy, thin clouds found at high altitudes. Cirrostratus clouds are thin, sheet-like clouds that cover the sky. Cirrocumulus clouds are fluffy clouds found in a thin layer at high altitudes.
6,000m-8,000m
cirrostratus
Noctilucent clouds are the highest and least understood. Cirrus and cirrostratus are the high-type clouds. Any high cloud will have the prefix "cirr".
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