National Winter Process Which city has the longest winter in 2020?

Dear friends, winter is coming this year. Are you ready? Some cities definitely want to get into winter quickly. After all, winter is too short, and now some cities have been cold for some time, so the following is definitely what everyone needs.

According to the perennial winter time of provincial cities, Xining, Harbin, Urumqi, Shenyang, Beijing, Tianjin and other 12 cities will enter winter one after another before the start of the winter solar term; Beginning of winter's winter cities are Shijiazhuang, Xi, Zhengzhou, Jinan, Nanjing and Hefei; After the beginning of the solar term in beginning of winter, all the cities that entered the winter are concentrated in the south, such as Wuhan, Hangzhou, Shanghai, Guiyang and Chengdu, which will usher in the coldest and most difficult time of the year.

Shenyang, last Sunday, the day before yesterday, the highest temperature was only 6 degrees, and the low temperature was -7 degrees! This is really a cold day waiting for us in early winter! Fortunately, this cold air comes and goes in a hurry. 10, the temperature in Shenyang began to rise, and then for a while, it was mainly warm air with relatively high temperature.

Who has the longest winter? On the list of winter days in provincial capital cities in China, there are six cities with winter days accounting for more than half of the whole year, among which Xining won the first place with 209 days, while Harbin and Lhasa ranked second and third with 204 days and 199 days respectively.

This winter, the cold air affecting China is still relatively frequent, and the overall impact is strong. The cold air path is mainly in the northwest direction.

Under this situation, the temperature in most parts of China is normal to low this winter, and the precipitation is generally more in the north and less in the south. The temperature changes obviously in stages. The temperature is normally high in most areas in early winter, and the influence of cold air on China will become stronger in the middle of winter (about 65438+ next year 10). The temperature in most parts of the central and eastern regions may be lower than normal, and there may be a large-scale low-temperature rain and snow weather process in the north, and it is unlikely that there will be a large-scale continuous low-temperature rain and snow freezing disaster in the south.

Cold air activities are frequent this winter, and the temperature fluctuates greatly, so it is necessary to guard against the adverse effects on the prevention and control of epidemic situation in COVID-19.

La Nina Event At present, the SST in the equator, the Middle East and the Pacific Ocean has entered the La Nina state, and it is expected that a weak to moderate intensity La Nina event will form in winter, and its later evolution trend and climate impact are still uncertain.

What is La Nina phenomenon?

La Nina phenomenon refers to the abnormal drop of sea surface temperature in the tropical Pacific Ocean, and its name comes from Spanish, which means "little girl". El Nino refers to the opposite natural phenomenon, meaning "little boy". "To put it simply, the La Nina event we are talking about is a phenomenon that the surface temperature of the equatorial Middle East Pacific is colder in a larger range than normal, and its intensity and duration reach certain conditions." Jia Xiaolong, deputy director of the National Climate Center, said that in terms of operational monitoring standards, there are some monitoring indicators for key sea areas. If this index is below -0.5℃ and lasts for more than 5 months, it can be defined as La Nina event.