What is characterized as an elongated area of low pressure?

A trough is characterized as an elongated area of low pressure, representing a region in the atmosphere where the pressure is lower than that of the surrounding areas. This low-pressure area is often associated with rising air, which can lead to cloud formation and precipitation. Troughs play a significant role in weather patterns, often influencing storm tracks and the movement of air masses.

In meteorology, the orientation and characteristics of a trough can indicate the potential for developing weather systems, including cyclones and fronts. Understanding troughs is crucial for pilots and weather professionals when assessing flight conditions and potential turbulence or storms.

Ridges, in contrast, refer to elongated areas of high pressure, which often result in clear skies and stable weather. Fronts are the boundaries between different air masses, and while they can be associated with significant weather changes, they are not defined as areas of low pressure but rather areas where high and low-pressure systems meet. A high-pressure system is the opposite of a trough, characterized by sinking air and often associated with fair weather.