Purple on a weather map typically indicates a mix of precipitation types, often showing areas where both rain and snow may be occurring simultaneously. In some cases, it can also represent very heavy snowfall or a significant ice accumulation.
The use of purple is meant to help viewers quickly understand the severity and type of weather conditions in a given area. For example, if a weather map has regions marked in purple, it is important to be aware of potentially hazardous driving conditions and to prepare for disruptions caused by the weather. Understanding these colors can help individuals make informed decisions, especially during winter storms or severe weather events.