Maritime polar air masses originate over the cold waters of the North Pacific Ocean and North Atlantic Ocean. These air masses are characterized by cool, moist conditions, which can lead to cloudy weather and precipitation. They typically influence coastal regions, bringing mild temperatures compared to continental polar air masses. When maritime polar air moves inland, it can interact with other air masses, resulting in various weather patterns. This interaction often leads to the formation of frontal systems, which can cause rain or snow in affected areas. Maritime polar air is essential for maintaining the climate in many coastal regions.