High pressure trough

Caldos weather control atmospheric survey

The Caldos weather substation monitoring atmospheric patterns

A high pressure trough was an elongated region of relatively high atmospheric pressure, impacting weather.

The Caldos colony weather substation tracked a high pressure trough while the weather control system was malfunctioning in 2370. (TNG: "Sub Rosa")

An unusual combination of meteorological terms, a trough is an elongated region of low pressure, whereas a ridge is a region of high pressure.
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