What is the term for the part of a frontal system where cold air is retreating?

The term used to describe the part of a frontal system where cold air is retreating is known as a warm front. In a warm front, warm air is advancing and moving over cold air that is retreating. This process can lead to gradual changes in weather, often characterized by increasing temperatures and cloud cover, followed by precipitation as the warm air rises and cools.

A warm front typically brings stratiform clouds and steady precipitation, contrasting with cold fronts, which are associated with more abrupt weather changes and can lead to thunderstorms. The distinction is important in aviation and meteorology, as recognizing the type of front can help pilots anticipate weather conditions. Understanding the dynamics of warm fronts is crucial for flight planning and ensuring safety in changing weather conditions.