The rainfall due to upward movement of air caused by convergence of cold air masses against warm air masses is called __________.

Frontal (or Cyclonic) rainfall occurs when two different air masses (warm, light air and cold, dense air) meet or converge. The boundary zone between them is called a front. When they collide, the warmer, moisture-laden air is forced to rise upward over the colder, heavier air mass, causing it to cool, condense, and precipitate.