An elongated area of depressed air in the upper atmosphere that is typically associated with cloudy skies and rain is a(n)

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A low-pressure trough is associated with cloudy skies and rain because the depressed air is more likely to rise, cool, and form clouds, which can lead to precipitation. High-pressure ridges, on the other hand, tend to be associated with clear skies and fair weather. The rain shadow effect occurs when mountains force air to rise, cool, and release moisture on one side, leaving the opposite side dry. Storm surge and squall lines are associated with weather events such as hurricanes and thunderstorms, respectively, and do not necessarily involve upper-level troughs.

An Elongated Area of Depressed Air in the Upper Atmosphere