A polar air mass is a large body of air that originates from polar regions, characterized by cold temperatures. These air masses form over ice-covered areas, such as the Arctic and Antarctic, and can bring chilly weather when they move into lower latitudes. When a polar air mass interacts with warmer air, it can lead to various weather phenomena, including snow and cold fronts. Meteorologists study these air masses to predict weather patterns and understand how they influence local climates, especially during winter months.