National winter progress map: Which city has the longest winter in 2020?
My friends, this year’s winter is coming soon, are you ready? Some cities definitely want to enter winter as soon as possible. After all, winter is too short, and some cities are already cold. It’s been a while, so everyone definitely needs the following. National winter map
Judging from the annual winter onset time in provincial capital cities, 12 cities including Xining, Harbin, Urumqi, Shenyang, Beijing, and Tianjin will enter winter one after another before the Beginning of Winter solar term; Cities where winter begins during the Lidong solar term include Shijiazhuang, Xi'an, Zhengzhou, Jinan, Nanjing and Hefei; cities where winter begins after the Lidong solar term are concentrated in the south, such as Wuhan, Hangzhou, Shanghai, Guiyang, Chengdu and other cities. It will be the coldest and most difficult time of the year.
In 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 at the beginning of winter! Fortunately, this cold air It came and went in a hurry. The temperature in Shencheng began to rise on the 10th, and in the following period, warm air dominated and the temperature was relatively high. Who has the longest winter?
In the ranking of winter days in provincial capital cities across the country, there are six cities with more than half of the winter days in the whole year, among which Xining won the title with 209 days. First place, Harbin and Lhasa ranked second and third with 204 days and 199 days respectively.
The cold air affecting our country this winter is generally relatively frequent, and its force is generally strong. The cold air path is mainly northwest.
Under this situation, the temperature in most parts of my country this winter is normal to low, and precipitation is generally more in the north and less in the south. Temperature changes in stages are obvious. In the early part of winter, the temperature in most areas is normal to high. In the mid-winter season (around January next year), the cold air force affecting my country will become significantly stronger. The temperature in most areas in central and eastern my country may be higher than the same period in normal years. On the low side, large-scale low-temperature rain, snow, and freezing weather processes are likely to occur in the north, while large-scale, sustained low-temperature rain, snow, and freezing disasters are less likely to occur in the south.
This winter, cold air activities are frequent and temperatures fluctuate greatly. It is necessary to prevent adverse effects on the prevention and control of the new coronavirus epidemic. La Niña event
The sea surface temperature in the equatorial central and eastern Pacific has entered a La Niña state. It is expected that a weak to moderate La Niña event will form in winter. There is still some uncertainty in its later evolution trend and climate impact.
What is La Niña?
La Niña refers to a climate phenomenon in which sea surface temperatures in the tropical Pacific Ocean drop abnormally. Its name originates from Spanish, meaning "little girl." El Niño refers to the opposite natural phenomenon, meaning "little boy". "To put it simply, what we call a La Niña event is a phenomenon in which the sea surface temperature in the central and eastern equatorial Pacific Ocean is colder in a large area compared with the same period in normal years, and the intensity and duration reach certain conditions." said Jia Xiaolong, deputy director of the National Climate Center, In terms of operational monitoring standards, there are monitoring indexes in some key sea areas. If this index is lower than -0.5℃ and lasts for more than 5 months, it can be defined as a La Niña event.