What do you call the retreating edge of a Cold Air Mass?

The retreating edge of a cold air mass is referred to as a warm front. In meteorology, a warm front is the boundary where a warmer air mass is advancing and replacing a colder air mass. This process typically occurs when the cold air mass is retreating or being pushed back by the warmer air flowing over it.

As the warm air rises over the cold air, it cools and condenses, often resulting in cloud formation and precipitation. The characteristics of a warm front typically include gentle slopes, steady precipitation, and a gradual temperature increase when transitioning from the cold air mass to the warm air mass.

Understanding this concept is crucial in meteorology, as it helps in predicting weather patterns and the types of conditions that can be expected with the movement of different air masses.