A Maritime Polar Air Mass is a type of air mass that forms over cold ocean waters, typically in polar regions. It is characterized by cool, moist air, which can lead to cloudy skies and precipitation. These air masses often influence weather patterns as they move toward land, bringing cooler temperatures and increased humidity. When a Maritime Polar Air Mass interacts with warmer air, it can create various weather phenomena, such as rain or snow. This air mass is essential in shaping the climate of coastal areas, particularly in regions like the North Atlantic and North Pacific Oceans, where it frequently occurs.