What does the term “squall line” refer to in aviation weather?

The term “squall line” specifically refers to a line of severe thunderstorms that is capable of producing heavy precipitation, strong winds, and often other severe weather phenomena such as hail or tornadoes. This type of weather formation typically occurs ahead of a cold front and can extend for many miles, posing significant hazards to aviation operations due to the intensity of storms and the potential for rapid changes in wind direction and speed.

Understanding the characteristics of a squall line is crucial for pilots and air traffic controllers, as these systems can lead to turbulence, wind shear, and sudden weather changes that can impact flight safety. The dynamic nature of squall lines makes them a central concept in aviation weather forecasting and risk assessment.