When air near the Earth's surface passes over obstacles like hills, mountains, or structures, mechanical turbulence is produced.
Eddies and turbulence are produced in the lower levels of the atmosphere by friction between the air and the ground, particularly when there is uneven terrain or artificial impediments present.
Thus, Mechanical Turbulence is the correct phrase.
These waves are produced when powerful winds that are normally perpendicular to mountains are lifted up above the mountains.
The winds may strike a significant inversion or stable air barrier as they ascend over the mountains, which will turn the winds back toward the surface.
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