What is the expected visibility when a warm front approaches?

• A. Clear visibility
• B. Poor visibility due to fog/rain/drizzle
• C. Very good visibility
• D. No visibility

Answer: (B)

When a warm front approaches, the expected visibility typically becomes poor due to the presence of moisture in the air that leads to fog, rain, or drizzle. As warm, moist air moves over cooler air, condensation occurs, often resulting in low clouds and precipitation. The transition associated with a warm front creates unstable atmospheric conditions that are conducive to reduced visibility. This is particularly noticeable when light rain or drizzle begins to occur ahead of the front, leading to decreased overall visibility in the area. The presence of clouds and precipitation, as well as potential fog formation, contributes to the poor visibility that characterizes these weather conditions.