upper-level trough

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upper-level trough [¦əp·ər ¦lev·əl ′trȯf]

(meteorology)

A pressure trough existing in the upper air, but sometimes restricted to the troughs that are much more pronounced aloft than near the earth's surface. Also known as high-level trough; trough aloft; upper trough.

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high-level trough

trough aloft

upper trough

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