Which statement accurately describes squall lines?

Squall lines are elongated lines of severe thunderstorms that are often associated with a cold front or a fast-moving weather system. When examining the nature of squall lines, it's evident that they usually exhibit non-frontal characteristics, which distinguishes them from standard cold fronts. They can generate severe steady-state thunderstorms that typically bring heavy rainfall, hail, strong winds, and even tornadoes.

The nonfrontal nature of these systems means they can occur in situations where there isn't a clear boundary, but conditions are favorable for linearly organized convective storms. These storms maintain activity for longer durations because they can continually generate and organize along the line. This characteristic of being nonfrontal is key to understanding why squall lines can produce severe weather events and do not conform to the traditional expectations associated with frontal boundaries.

The other options describe aspects that do not align with the defining characteristics of squall lines. For instance, they are not typically short-lived; rather, they can persist over considerable distances and time. While they can certainly produce light rain showers, this is not their defining feature; their capacity for severe thunderstorms is much more significant. Furthermore, squall lines are often unpredictable in terms of their severity and movement, making them challenging to avoid. Hence, the statement