What occurs during a cold front event?

During a cold front event, cold air moves into an area occupied by warmer air, effectively displacing the warmer air. This process is often characterized by a rapid temperature drop, leading to the cold air "bulldozing" the warmer air upward. As the colder, denser air advances, it forces the warm air to rise, which can lead to the formation of clouds and precipitation as the warm air cools and condenses. This upward movement of warm air can also result in stormy weather, including thunderstorms, depending on the intensity of the cold front.

The other scenarios presented do not accurately describe the dynamics of a cold front; for instance, cold air stagnating over warm air does not represent the typical active movement associated with cold fronts. Similarly, saying that warm air dissipates immediately does not adequately capture the energetic exchange that occurs during the arrival of a cold front.