How are squall lines represented on weather charts?

Squall lines are significant meteorological features that indicate a line of severe thunderstorms typically associated with a cold front. On weather charts, they are represented by a double dotted and dashed purple line. This specific representation helps meteorologists and forecasters identify areas where there is potential for severe weather, including heavy rainfall, strong winds, and even tornadoes.

The use of a purple color in the line signifies alertness and severity, which is important when indicating the potential for hazardous weather conditions. The double dotted and dashed format is distinct, making it easily identifiable on weather charts, which is essential for timely and accurate weather forecasting. Recognizing this representation is critical for understanding weather patterns and preparing for severe weather events. Other options do not match the standards used for depicting squall lines on weather charts.