What meteorological feature is defined as an elongated area of low pressure?

A trough is a specific meteorological feature characterized by an elongated area of low pressure. In atmospheric science, troughs are associated with the dip or extension of the jet stream and can influence weather patterns. They often lead to cloud formation and precipitation as moist air rises along the edges of the trough, resulting in various weather phenomena.

Troughs are crucial for understanding dynamics such as the movement of storms and the distribution of temperature and moisture in the atmosphere. They contrast with ridges, which are areas of high pressure. Recognizing troughs is essential for forecasting, as they generally herald changes in weather conditions, often indicating incoming storm systems or shifts in air mass.

Understanding why a trough indicates low pressure is foundational to meteorology, distinguishing it from other features such as peaks, cyclones, or valleys, which have different characteristics and implications in weather patterns.