China News Service, January 6th, according to comprehensive news, the cold air has continued to "fight" in the past few days, and many netizens feel the "freezing and cracking"!

The Central Meteorological Observatory will continue to issue a blue cold wave warning at 6 o'clock on January 6. It is expected that the cold wave will affect most of the central and eastern parts of my country today and tomorrow (January 6-7). The local temperature drop will exceed 10 ℃. Will refresh the lowest temperature since this winter.

Why is it so cold this winter?

How to defend well in this weather?

Data map: Citizens travel in thick jackets.

Photo by China News Agency reporter Yu Jing

Cold wave weather continues to affect the central and eastern parts of Shanxi, Shandong and other places with greater cooling rates

  According to the statistics of the National Climate Center, since the beginning of winter (December 1, 2020-January 3, 2021), there have been two cold air processes affecting my country in December 2020, which were from December 13th to 15th (national type). Strong cold air) and December 29 to January 1 (national cold wave).

Compared with the same period in history, although the number of cold air (including cold waves) is not too high, these two times are national cold air processes with a large impact area and strong cold air intensity.

  Cold wave weather continues to affect the central and eastern parts of my country. Affected by strong cold air, from 08:00 on the 6th to 20:00 on the 8th, the eastern and southern parts of Northeast China, the eastern part of Northwest China, most of North China, Huanghuai, Jianghuai, Jianghan, Jiangnan, and eastern Southwest China , South China, Taiwan Island and other places will drop by 6-8°C successively. Among them, the temperature in parts of Southwestern Shanxi, central and southern Shandong, most of Jiangsu, Shanghai, northwestern Jiangxi, Zhejiang, and northwestern Fujian will drop by 10 ℃.

2021 January 6th, 8:00 to 8th, 20: 00 process cooling forecast map

The minimum temperature forecast map from 8:00 on January 6, 2021 to 20:00 on January 8, 2021

  After the temperature drops, the 0℃ line of the lowest temperature will be pressed south to southern Jiangnan to northern South China, and the -10℃ line will be pressed south to Qinling to eastern Jianghuai.

There will be northerly winds of magnitude 4 to 6 and gusts of magnitude 7 to 9 in the Yangtze River Basin and its north.

The Central Meteorological Observatory continued to issue blue cold wave warnings at 06:00 on January 6.

  Although, compared with the cold wave at the end of 2020, the temperature drop during this cold wave is generally less than that of the last one, but because the temperature continues to fall on a lower base temperature, the temperature after cooling is lower than the cold wave at the end of 2020, like The lowest temperature in Shenyang on the 7th was -27℃, and today's lowest temperature in Jinan was -17℃.

In addition, from the 6th to the 8th, the highest temperature in many places in the central and eastern regions will also hit a new low since this winter.

Today and tomorrow there will be more rain and snow in the south of the Shandong Peninsula, or there will be blizzards

  Compared with the strong wind to cool down, the rain and snow brought by the cold wave during the southward process is not much, mainly concentrated in the south; and due to the limited water vapor transport, the overall precipitation is relatively small.

However, the eastern part of the Shandong Peninsula will face a strong cold current snowfall process, local heavy snow or blizzard, the main snowfall period is from today night to tomorrow day.

National Precipitation Forecast Map (8:00 on January 6th-8:00 on January 7th)

  The Central Meteorological Observatory predicts that today, the central and eastern parts of the Northeast, the southeastern part of the Northwest, the central and eastern parts of the Shandong Peninsula in the southwest, the western and southern mountainous areas of Xinjiang, the western and northern Tibet, the southern Gansu, the western Jianghan, the northeastern part of the Southwest, and the northern Jiangnan Some areas of the land have light to moderate snow or sleet. Among them, there are heavy snow or blizzards in western Tibet, western mountainous areas in southern Xinjiang, eastern Shandong Peninsula, and southwestern Hubei.

There were light rains or showers in parts of the southeastern part of Southwest China, most of Jiangnan, central and western Guangxi, Taiwan Island and other places, and local moderate rain.

National precipitation forecast map (from 8:00 on January 7 to 8:00 on January 8)

  Tomorrow, there will be light snow or sleet in parts of western mountainous areas in southern Xinjiang, eastern Jilin, Shandong Peninsula, southeastern Northwest China, southeastern Tibet, eastern Southwest China, western and southern Hunan, and northeastern Yunnan. Among them, Shandong Peninsula There is moderate to heavy snow in parts of the northern part and eastern part of the Sichuan Basin.

There was light rain in parts of southeastern Yunnan, most of Guangxi, Taiwan Island and other places, and local moderate rain.

National precipitation forecast map (8:00 on January 8-8:00 on January 8)

Why is it so cold this winter?

Expert interpretation

  The Beijing News reported that according to the statistics of the National Climate Center, since the beginning of winter (December 1, 2020-January 3, 2021), there have been two cold air processes affecting my country in December 2020, one in December. 13 to 15 (national type of strong cold air) and December 29 to January 1 (national type of cold wave).

Compared with the same period in history, although the number of cold air (including cold waves) is not too high, these two times are national cold air processes with a large impact area and strong cold air intensity.

  Experts explained that since the beginning of winter, the middle and high latitudes of Europe and Asia have been controlled by the meridional circulation of “high west and low east”, and the East Asian winter monsoon is relatively strong, and this circulation pattern has basically remained unchanged in December. The "high west and low east" meridional circulation and the continuous strong winter monsoon are the direct causes of the low temperature in most areas of central and eastern my country since December 2020.

  In addition, the recent peak of the La Niña phenomenon in the equatorial Central and Eastern Pacific and the lack of sea ice in the Arctic in autumn are two signs that cannot be ignored.

Historical statistical analysis shows that in most La Niña winters, the meridian of the atmospheric circulation in the middle and high latitudes of Europe and Asia is relatively large, and the cold air activities affecting my country are more frequent and strong than usual. The low probability is also greater.

  In September 2020, the Arctic sea ice was unusually low (the second least in history).

Studies have pointed out that the lack of Arctic sea ice in September is conducive to the stronger Siberian high in winter.

Monitoring in the summer of 2020 shows that the atmospheric circulation in the Arctic region exhibits a typical negative AD phase, with its modal index reaching the lowest value in history. Therefore, this is also conducive to the stronger Siberian high this winter and the stronger East Asian winter monsoon.

  In general, the most direct cause of the current low temperatures in most of the central and eastern parts of my country is the "high west and low east" meridional circulation and the strong East Asian winter monsoon. The lack of La Nina and autumn Arctic sea ice is the winter monsoon this year. Too strong provides an important background condition.

Defense guide:

  1. The personnel should pay attention to adding clothes to keep warm; prepare for the defense against strong wind and cooling weather in production;

  2. Fasten the doors and windows, hoardings, scaffolds, temporary structures and other structures that are easily blown by strong wind, and properly arrange outdoor objects that are easily affected by strong wind;

  3. Go to a sheltered place to avoid wind and notify outdoor workers to pay attention to safety;

  4. Pay attention to the latest information about the strong wind cooling reported by the relevant media in order to take further measures;

  5. Transportation, public security and other departments should prepare for road icing in accordance with their duties.