A warm front is a weather phenomenon that occurs when a warm air mass moves into an area occupied by cooler air. As the warm air rises over the cooler air, it cools and condenses, often leading to cloud formation and precipitation. This transition typically brings gradual temperature increases and can result in extended periods of rain or drizzle. Warm fronts are usually associated with specific types of clouds, such as nimbostratus and stratus, which can cover large areas. The passage of a warm front is often marked by a shift in wind direction and a change in humidity levels, signaling a change in weather patterns.