What is a squall line?

A squall line is a meteorological phenomenon characterized by a line of severe thunderstorms that typically forms along or ahead of a cold front. This type of weather pattern is associated with rapidly changing conditions, heavy rainfall, strong winds, and often severe weather events such as hail or tornadoes. The dynamics of a squall line arise when warm, moist air rises ahead of a cold front, leading to explosive thunderstorm development.

Understanding this concept is crucial for dispatchers and pilots as squall lines can significantly impact flight safety and route planning. Recognizing the conditions that lead to the formation of a squall line allows for better decision-making in the face of adverse weather, ensuring the safety and efficiency of flight operations.

The other options describe different weather phenomena or atmospheric conditions that do not fit the specific definition of a squall line, highlighting the importance of precise terminology in meteorology.