cirrostratus
Noun
Meaning
a thin uniform layer of hazy cloud at high altitude
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Cirrocumulus in its pure form is actually a high cumuliform genus, and cirrostratus is stratiform, like altostratus and lower based sheet clouds.
Stratocumuliform and stratiform clouds in the high étage carry the prefix cirro-, yielding the respective genus names cirrocumulus (Cc) and cirrostratus (Cs).
Summary of high cloud genera A solar halo There are three main genera in the family of high clouds: cirrus, cirrocumulus, and cirrostratus.
The other two genera, cirrocumulus and cirrostratus, are also high clouds.
These were respectively stratocumuliform and stratiform cloud genera of a newly defined middle étage above stratocumulus and stratus but below cirrocumulus and cirrostratus.
The stratiform group is cross-classified into the genera cirrostratus (high-étage), altostratus (middle-étage), stratus (low-étage), and nimbostratus (multi-étage).