mid-level clouds; middle clouds
Technical meteorological term for clouds with bases between about 2,000 and 7,000 meters, including altostratus and altocumulus.
Mid-level clouds include altocumulus and altostratus.
Low-level clouds (bases below about 2,000 m), such as stratus and stratocumulus.
Compound of 中層 (middle layer) + 雲 (cloud).