In the autumn of 202 1, the heat in the south set a record. What caused it?

The reason is that the subtropical high is very strong, the "autumn tiger" in the south is extremely strong, and the high temperature in southern Jiangnan and southern China is much higher, which has enough high temperature endurance and strength. Generally speaking, July-August is the time when the number of high temperature days in the south is the highest. In September this year, the high temperature in some parts of the south was higher than normal, and it was higher than that in July and August this year.

Jiangxi, Guangdong and Hunan provinces experienced record-breaking high temperatures in September this year. From 65438+1 October 29 to1day, with the weakening of the south pressure of subtropical high, the high temperature range will shrink southward, and the highest temperature in the middle and lower reaches of the Yangtze River will drop to about 30℃, but some areas in Guangdong, Guangxi and Fujian still have high temperatures.

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However, during the National Day holiday, the subtropical high will "return" strongly, and there will be continuous high temperature and little rain in Jiangnan and South China again. The hot weather in the eastern Sichuan Basin, Jianghan, Jiangnan and South China will develop again, and the highest temperature in some areas will reach above 37℃, which may reach or exceed the historical extreme value in the same period.

For example, Wuhan, Changsha, Nanchang and other places have frequent high temperatures from June 5438+00 to June 5438+0 to June 4, especially in Changsha, which may tie or break the latest high temperature record. The public should pay attention to the weather forecast and pay attention to heatstroke prevention and cooling. In North China, Northwest China, Huanghuai and other places, until the early National Day holiday, the temperature fluctuated, but the overall temperature was still high and the body felt more comfortable.

Affected by cold vortex, the northeast region has frequent rainfall, and the temperature continues to drop, which is lower than normal. From September 30th to June 2nd 10, the coolest day since autumn may appear in the north-central part of Northeast China. The highest temperature in Harbin and Changchun is only 13℃ to 14℃, and the lowest temperature will drop below 5℃. The public should pay attention to temperature changes.