Breadcrumb Home Image Gallery Clouds Form Due to Weather Fronts CMMAP Cold air is more dense than warm air, so when a warm air mass meets a cold air mass, the cold air ends up below the warm air. Once the air has risen, it cools and clouds can form. Learn More Clouds and How They Form Clouds Form Due to Weather Fronts Clouds Form Due to Surface Heating Clouds Form When Air is Forced to Rise Clouds Form Due to Mountains
