What is the cause of extreme cold weather?

In view of the causes of "extremely cold" weather, Guo Yanjun, a senior engineer in the Climate Monitoring Office of the National Climate Center of China Meteorological Bureau, believes that since the winter, La Nina events in the equatorial Middle East and Pacific Ocean have continued to develop, which easily leads to low temperatures in most of winter in China. At the same time, the SST in the North Pacific continues to be warmer, the Siberian high continues to be stronger, and the thermal difference between land and sea increases, which is beneficial to the strong winter winds in East Asia and brings cold air.

Guo Yanjun said, especially on the eve of the Spring Festival, the atmospheric circulation changed obviously, and the Arctic Oscillation showed an obvious turning point, and the polar cold air spread southward. At the same time, the establishment and maintenance of Ural blocking high in high latitudes help the cold air in the north to move southward and affect China.

On the other hand, the Ural Mountains and the Sea of Okhotsk often have blocking high pressure. When they remain stable, it is rainy in the south of China and rainy and snowy in winter. When the Urals blocking high pressure weakens and collapses, it often leads to the outbreak of cold wave in China.

Extended data

Extremely cold weather in Hulunbeier, Inner Mongolia;

12 13 In the early morning, people living in Hulunbeier, Inner Mongolia Autonomous Region felt cold. Netizens said on social media: "-43.6℃, as expected, the coldest day since winter has arrived."

On 13, the reporter learned from the Meteorological Bureau of Inner Mongolia Autonomous Region that from 20: 00 on 12 to 08: 00 on 13, extremely cold weather below -40℃ occurred in Hulunbeier 13 monitoring station, and the lowest temperature appeared in Wulikuma, genhe city, reaching -43.6℃.

In addition, on June 5438+03, affected by strong cold air, the temperature in Huzhong District, Daxinganling, Heilongjiang Province, the coldest town in China, reached -40.9℃, which ushered in the lowest temperature since this winter.

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