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A warm front is defined as the leading edge of an advancing warm air mass. As the warm air moves into an area previously occupied by cooler air, it gradually rises over the cooler air due to its lower density. This process often results in the formation of clouds and precipitation as the warm air cools and condenses. The characteristics of a warm front typically include a gradual increase in temperature and a shift in wind direction as the front passes, distinguishing it from other types of fronts such as cold fronts or stationary fronts.

The other choices describe different atmospheric phenomena: the first refers to a cold front where a cold air mass meets a warm air mass, the third defines a stationary front that does not move, and the fourth pertains to a scenario involving the convergence of cold air masses, which is not descriptive of a warm front. Understanding the concept of warm fronts is crucial for anticipating weather patterns, especially in aviation where changes in flight conditions can be significant.