Why do typhoons rarely land on the coast of northern Jiangsu?

This is a relatively simple question, provided that the map of China is memorized. But to understand this problem, we need to know the concept of "Northern Jiangsu". Northern Jiangsu refers to the eastern coast of Chinese mainland and the northern wing of the Yangtze River Delta, covering an area of about 52,300 square kilometers, including Lianyungang, Xuzhou, Suqian, Huai 'an and Yancheng.

I believe everyone knows that the map of our country seems to be a rooster standing in the east of the world, with a land area of over 9.63 million square kilometers and a territorial sea area of over 4.7 million square kilometers. The total length of coastline twists and turns is 6.5438+0.8 million kilometers. From East China (Su Ru, Zhejiang, Shanghai, Anhui, Fujian, Taiwan Province, Jiangxi), South China (Guangdong, Hong Kong and Macao, Guiqiong), North China (Beijing, Tianjin, Hebei, Shanxi, Central Inner Mongolia), Central China (Henan, Hubei, Hunan), Southwest China (Sichuan, Chongqing, Guizhou, Yunnan, Tibet), Northwest China (Shaanxi

No matter from the map of China or the map of the world, it is not difficult to see that the coastline of China is roughly clockwise except the Shandong Peninsula and Leizhou Peninsula, which extend to the sea. On the whole map, the map shape of Jiangsu is inclined from northwest to southeast, Zhejiang, Fujian and Guangdong are inclined from northeast to southwest, and Shanghai and its surrounding areas are basically at the "apex" of this arc.

The coastline of northern China is just on the "concave surface" in the upper half of this arc. When a typhoon is generated on the tropical ocean surface at low latitude, its path is often affected by factors such as air pressure and topography along the way, and it moves to the west, northwest, northwest or due north. Combined with the geographical location of northern Jiangsu, it is not difficult to find that there is Japan Island in the east and Ryukyu Islands in the southwest, stretching for more than 1000 kilometers.