The weather on both sides

Frontal surface is a general term for frontal surface and frontal line. Frontal is the interface formed when two air masses with different properties meet. The front is the line where the front intersects the ground. The front is a narrow and inclined transition zone, and the temperature and humidity on both sides of the front are very different. The weather near the front changes dramatically, often accompanied by clouds, rain, strong winds and other weather phenomena. So, this question is right.