What is a non-frontal, narrow band of active thunderstorms that often develops ahead of a cold front called?

A non-frontal, narrow band of active thunderstorms that often develops ahead of a cold front is known as a squall line. Squall lines are characterized by a series of thunderstorms that can produce severe weather, such as heavy rainfall, strong winds, and sometimes hail or tornadoes. They typically form in a line, which can cover a significant distance and may be associated with cold air moving in at the surface while warm, moist air is lifted ahead of the advancing cold front.

Understanding squall lines is crucial for pilots as they can pose significant hazards, including turbulent air and severe downdrafts, which are important considerations for flight planning and safety.