CAAP Private Pilot License (PPL) Meteorology Practice Test

An occluded front forms when

A cold front overtakes a warm front A warm front overtakes a cold front A stationary front lifts A dry line forms

Correct Answer:

A cold front overtakes a warm front

Explanation:

Occluded fronts form when the cold front catches up to and overtakes the warm front, forcing the warm air to rise aloft and effectively removing the warm sector from between the boundaries. This merging creates a single, lifted boundary around which air masses are rising and cooling, often bringing widespread precipitation and a shift in wind and temperature as the cyclone evolves. The other scenarios don’t produce an occlusion: if the warm front overtook the cold front, the pattern would not create the classic occluded boundary; a stationary front that lifts doesn’t merge the two fronts; and a dry line is simply a moisture boundary, not the process that creates an occlusion.

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