An occluded front occurs when a cold front overtakes a warm front, lifting the warm air off the ground. This process typically happens in mid-latitude cyclones, where different air masses interact. The warm air is forced upward, leading to cloud formation and precipitation. There are two types of occluded fronts: cold occlusion and warm occlusion. In a cold occlusion, the air behind the cold front is colder than the air ahead of the warm front. In a warm occlusion, the air behind the cold front is warmer than the air ahead of the warm front. Both types can result in significant weather changes.