Английская Википедия:Etage

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A cloud étage is a meteorological term used to delimit any one of three main altitude levels in the troposphere where certain cloud types usually form. The term is derived from the French word which means floor or storey, as in the floor of a multi-storey building. With the exception of the low étage, the altitude range of each level varies according to latitude from Earth's equator to the arctic and antarctic regions at the poles.

Correspondences for étages and cloud genus types

Файл:Cloud types en.svg

Cloud types and étages

The high étage ranges from altitudes of Шаблон:Convert in the polar regions, Шаблон:Convert in the temperate regions and Шаблон:Convert in the tropical region. The major high-level cloud types comprise cirrus, cirrocumulus, and cirrostratus.

The middle étage extends from Шаблон:Convert above surface at any latitude as high as Шаблон:Convert near the poles, Шаблон:Convert at mid latitudes, and Шаблон:Convert in the tropics. Altocumulus and Altostratus are the main cloud types found in the middle levels of the troposphere.

The low étage is found from surface up to Шаблон:Convert at all latitudes. Principal cloud types found in the low levels of the troposphere include stratocumulus, stratus, and small fair weather cumulus.

Several additional types usually form in the low or middle étages but typically extend into all three altitude levels as clouds with significant vertical extent. These include nimbostratus, towering cumulus congestus, and cumulonimbus.

References

Шаблон:Cloud-stub