An occluded front forms when a cold front overtakes a slower-moving warm front. The occluded front is more complicated than the others because two fronts interact. In the left diagram, colder air is wedging under warm air at the cold front. Warm air is gliding up and over another cold air mass at the warm front. The result of what is happening in the left diagram is seen in the right diagram. The warm air squeezed out and lifted above the ground. Steady rains falls at an occluded front.
Source:http://kidlat.pagasa.dost.gov.ph/genmet/fronts/classification_of_fronts.html
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