Question ATPL - Airline Transport Pilot license - Meteorology

ATPL - An occlusion is called a warm occlusion when the cold air:

At the rear of the occlusion is colder than the cold air ahead.

Ahead of the surface position of the occlusion is only at a higher altitude.

At the rear of the occlusion is colder than the cold air ahead, with the warm air at a higher altitude.

At the rear of the occlusion is less cold than the cold air ahead, with the warm air at a higher altitude.