Why is the snowstorm in Chenzhou the strongest in the winter of 2007? Is it related to topography and climate?

Chenzhou City is located in the southeast of Hunan Province, at the intersection of Nanling Mountain and Luo Xiao Mountain, and at the intersection of Yangtze River and Pearl River.

The landform in the territory is complex and diverse, mainly hills, with equal hills and less water surface. Hilly areas account for nearly three quarters of the total area. The terrain is high in the southeast and low in the northwest, and the southeast is dominated by mountains; The northwest is dominated by hills, hills and plains.

Cold air comes from the north. The low hills are in the north of Chenzhou, and the Nanling Mountains are in the south. Just to block the cold air from the north, the snow fell there.