During which stage of a warm front passage does most precipitation occur?

The correct answer is that most precipitation occurs before the frontal passage. In a warm front situation, warm, moist air rises gradually over cooler, denser air. As this warm air ascends, it cools and condenses, resulting in cloud formation and precipitation. This process begins well in advance of the actual front reaching a given location, meaning that the heaviest and most sustained precipitation typically occurs before the front itself passes.

As the warm front approaches, clouds and light rain often start forming, intensifying as the front nears. The precipitation can cover a wide area and usually lasts longer than that associated with a cold front. After the warm front has passed, conditions generally improve, with decreasing cloud cover and precipitation. During the frontal passage, there may be some rainfall, but it is often less intense than the precipitation that occurred before the front arrived.