Why is it so hot in early autumn?

In China, autumn tiger refers to the short-term high temperature weather after beginning of autumn (around August 8). The reason for the formation of autumn tiger is that the western Pacific subtropical high that controls China gradually moves southward in autumn, but moves northward. Under the control of this high pressure, it turned cloudy and sunny locally, with strong solar radiation and rising temperature. This regenerative weather is called "old woman summer" weather in Europe and "Indian summer" weather in North America.

1999, the autumn tigers in China came late and fiercely. In early September, the high temperature in Henan Province was between 35-38℃ for five consecutive days, Jinan climbed to 36.2℃, and the temperature in Nanjing, Chongqing, Wuhan, Nanchang and Sizhi Furnace rose to 35-39℃ again.

Due to the vast territory of China, the performance of "Autumn Tiger" is slightly different. For example, the autumn tigers in South China are later than those in the Yangtze River valley, generally delayed by 2-4 solar terms. In addition, the prevention and control time of autumn tigers is long and short every year, ranging from half a month to two months; Sometimes the autumn tiger comes and goes, and then goes back. "Autumn Tiger" weather, although the temperature is high, but generally speaking, the air is dry and sunny, it will not be very hot in the morning and evening, and it will not be too hot to breathe.

From August 8th after beginning of autumn this year to 19, Qiu Hu seems to be asleep. During this period, the temperature in most parts of the country is low, and some places even have historical extremes. However, from 20th to yesterday, due to the strengthening of the subtropical high and the westward advance, the temperature in most parts of Jianghuai, Jiangnan and South China obviously rose to 35-38℃. It is expected that the hot weather in the above areas will continue in the next two to three days. It seems that the autumn tigers in these places have woken up and started to show off.