What happens when an occluded front forms?

When an occluded front forms, it generally involves a warm front being lifted above a cold front. This phenomenon occurs when a cold front catches up to a warm front, resulting in the warm air being forced upwards between the two colder air masses. This can lead to the formation of clouds and precipitation, as the lifted warm air cools and condenses.

The process of occlusion is significant in meteorology as it often indicates the final stages of a weather system, like a low-pressure area. The lifting of the warm air creates an environment conducive to cloud formation and potential precipitation, influencing weather patterns.

The other options describe different interactions between air masses that do not occur during the formation of an occluded front. For instance, a cold front moving away from a warm front or a stationary front developing does not accurately represent the dynamics of an occluded front.