Sichuan weather "ice-fire reversal" reappears "face change" How is this cold air formed?

Sichuan weather "ice-fire reversal" reappears "face change" How is this cold air formed? Let's discuss this problem below, hoping that these contents can help friends in need.

The wind blew all night, fearing that the children would catch cold when they were students and sweat in the afternoon. I specially prepared several sets of clothes and pants in my backpack. On the morning of "14", Song Jinlong, a retired man from Chengdu, reluctantly left the kindergarten after giving his little granddaughter in a thin velvet vest to her life teacher. Under the office building across the street, office workers with folding umbrellas are in a hurry, and there are also many fashionable female models wearing half sleeves.

13 that night, an "unexpected" cold air swept across many places in Sichuan. Sichuan Meteorological Bureau made a weather forecast as early as 12, and there was a whole process of cooling and precipitation in Sichuan from 13 to 16, and the daily average temperature would be reduced by 6~9 degrees Celsius. At noon on 13, Sichuan issued a blue warning of strong cooling, saying that the highest temperature in the intermountain basin would drop to 1 1 ~ 13 degrees Celsius on 16. And this data, which is closely related to some people's food, clothing, housing and transportation, was three days ago or 25~27 degrees Celsius.

This is not the first time that Sichuan staged a "face change" in 2022, nor is it the first time that meteorologists reminded the public that "thick clothes and trousers in autumn and winter should not be put away in a hurry" according to the weather forecast of "more than 30 minus 15". In the previous March, the average temperature in Sichuan was 14.9℃, which was the lowest in the same period in history, at 1. During the strong cooling from March 19 to March 2 1, many urban areas in Sichuan changed seasons overnight, and Nanchong National Meteorological Station also plummeted 17.6 degrees Celsius in three days, reaching the highest in our province.

"Spring is the connecting season of atmospheric circulation from winter to summer, and the ups and downs of temperature are more common in history. Sichuan is not only harmed by the cold air in the north, but also easily affected by the warm and humid airflow in the southwest, which is likely to lead to abnormal temperature fluctuations similar to the recent ones. " Sun, an engineer from Sichuan Climate Center, was interviewed by China News Network. He introduced in detail that several strong cooling events in Sichuan since the spring have the same characteristics. In the early stage, the temperature was abnormally high after being manipulated by warm and dry cyclones, and a lot of kinetic energy was concentrated in the air, which collided with cold air obviously, causing the temperature to fluctuate greatly.

Even if "there are four seasons in January, and the tenth day is different", as long as the sun appears, Chengdu's urban greenway and Jinjiang will enter the home to sleep in the sun, which is also the leisure and romance that Sichuanese have engraved in their hearts. "After this round of cooling, it is a good time to step into spring, so we should be fully prepared." Ms. Zhang, a citizen of Chengdu who has bought an outdoor tent, said that after seeing the sleeping photos of WeChat friends circle, she did not "blindly follow the trend". Instead, she said, "The yellow grass cherry in Panzhihua has just been sold out, and the juicy bayberry is ripe."