FAA Ground School Practice Test

A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a:

1. Thunderstorm cell

2. Squall line

3. Frontal boundary

4. Convective layer

The correct answer is: Squall line

The term "squall line" refers specifically to a nonfrontal, narrow band of thunderstorms that can develop ahead of a cold front. Squall lines are characterized by their elongated shape and the potential for severe weather, including strong winds, heavy rain, and even tornadoes, often resulting from the lift provided by the cold front moving in. These lines are typically associated with a line of convection, where warm, moist air rises rapidly, leading to the development of thunderstorms. The distinguishing feature of a squall line is its organization in a straight line, as opposed to isolated thunderstorm cells, which can develop independently. While terms like "thunderstorm cell," "frontal boundary," and "convective layer" are related to weather phenomena, they do not specifically describe the organized band of thunderstorms that is characteristic of a squall line. Therefore, the correct answer accurately encapsulates this specific weather structure, highlighting its role in severe weather development in relation to cold fronts.