What type of weather front forms when a cold front overtakes a warm front?

An occluded front forms when a cold front overtakes a warm front.

In a mid-latitude cyclone, a faster-moving cold front can catch up with the warm front ahead of it. The warm air is then lifted away from the ground, while the colder air masses meet near the surface. The resulting boundary is called an occluded front.

Occlusions commonly develop late in the life cycle of extratropical cyclones. They can bring extensive cloud, rain, snow, and shifting winds, although the exact weather depends on the temperatures and moisture of the air masses involved.

Meteorologists distinguish cold-type and warm-type occlusions according to which air mass is colder near the surface. An occluded front is not simply any front with bad weather: its defining feature is the overtaking of a warm front by a cold front.