Has the new round of strong cold air cooled down in the middle and east of the road?

165438+1October 15 school, according to the latest weather forecast, due to the influence of strong cold air,16 to 18, there will be a large-scale gale cooling and rain and snow weather process from north to south in China. The temperature in most parts of the central and eastern regions will drop by 8 ~ 10℃, and the temperature drop in some areas will exceed 12℃. There are 4 ~ 6 northerly winds in most areas north of the Yangtze River, and gusts can reach 7 ~ 8.

165438+1October 10, Hebei ushered in windy and cool weather, and Shijiazhuang people were "fully armed". ?

Cold air caused the temperature in Northeast China and North China to hit a new low since winter.

On June 5438+065438+ 10, several rounds of cold air continuously pulled many places in China from north to south from late autumn to early winter, and some areas ushered in the first snowfall or "coldest day" in the second half of the year.

Taking 14 as an example, the temperature in Northeast China, North China, Huanghuai and other places dropped significantly, and most parts of Northeast China and North China spent the coldest day since this winter.

According to the weather forecast, the highest temperature in the north-central part of Northeast China and eastern Inner Mongolia drops below freezing point at 14, and the lowest temperature drops below-10℃. For Harbin, Changchun and many other places, this winter is the first time to experience the temperature below 0℃ all day, and the highest temperatures in Beijing and Tianjin will also hit a new low this winter. It is estimated that by 15, Beijing, Shijiazhuang and other places in North China are expected to refresh the lowest temperature since the second half of this year.

Sun Jun, chief forecaster of the Central Meteorological Observatory, said that the cold air currently affecting the central and eastern regions began to affect China on 13, and the impact periods were mainly concentrated in 13 and 14.

"This round of cold air has a small influence range and weak intensity, mainly affecting Northeast China, North China, Huanghuai and Jianghuai areas. The cooling range is 4 C-6 C, and the local area exceeds 8 C. At the same time, the above areas are accompanied by northerly winds of 4-5. " Sun Jun said.

According to reports, as far as the cooling situation is concerned, in this round of cooling, Hebei has a large cooling range. From 8: 00 June 5438+03 to 8: 00 June 5438+04, the temperature drop in Zanhuang, Lincheng, Neiqiu and other places along the mountain in western Hebei Province reached more than 10℃. During the daytime of 14, the temperature in the eastern part of Northeast China, Huanghuai, Jianghuai and other places will be lower than 13. At present, the front of this cold air has reached the middle and lower reaches of the Yangtze River, but it will not continue to affect Jiangnan and South China.

165438+1October 10, Taiyuan, Shanxi, people are "fully armed" to resist the cold wind when traveling. ?

A new round of strong air conditioning has partially cooled down or exceeded 12℃ in the middle and east of the road.

However, when people in Northeast China and North China are discussing the new low temperature, a new round of strong cold air with larger scope and wider influence is already on the way.

According to the forecast, from the night of 16, a new round of strong cold air from the Mongolian Plateau will enter China, Inner Mongolia and northern Xinjiang, and will affect most of the central and eastern regions from north to south. Affected by it, from June 16 to June 18, there will be a large-scale gale cooling and rain and snow weather process from north to south in China.

According to meteorologists, the intensity of this round of cold air is stronger than that of 13 to 15, which has a wider impact and will have a more obvious impact on the cooling in the southern region. In addition, the influence of this round of cold air process is mainly strong wind.

According to the forecast, in the future, affected by this round of strong cold air, the temperature in most parts of the central and eastern regions will drop by 8 ~ 10℃, and the cooling range in some areas will exceed 12℃, and the ground minimum temperature of 0℃ will be pressed southward to the area along the Huaihe River in the early morning of 19. There are 4 ~ 6 northerly winds in most areas north of the Yangtze River, 7 ~ 8 gusts, and 7 ~ 9 winds in the eastern and southern seas.

In terms of precipitation, there will be small to medium snow or sleet in most parts of eastern Inner Mongolia and Northeast China, heavy snow in eastern Jilin, small to moderate rain in Huanghuai, Jianghuai, Jianghan, Jiangnan, eastern Southwest China and South China, and heavy rain in parts of Jiangnan. In addition, 16 ~ 17, there is little to medium snow or sleet along Tianshan Mountain in northern Xinjiang, and there is heavy snow locally.

"This round of cold air process has the characteristics of fast moving speed, wide influence range and large cooling range. Cold air enters Inner Mongolia at night from 16, and reaches the middle and lower reaches of the Yangtze River at night from 17. 18 at night, the cold air will continue southward and reach the South China Sea. It can be said that it will sweep across most parts of central and eastern China from north to south in just two days. " Sun Jun said.

Regarding the impact of cold air on agriculture, Sun Jun introduced that around 19, the first frost will appear in the western and southern parts of Huanghuai, Jianghuai and other places. Wind and rain weather is not conducive to the production of protected agriculture and animal husbandry, late sowing of winter wheat and the growth of open vegetables. For the southern region, 17 ~ 18 rainfall in the south of the Yangtze River is slightly unfavorable to the drying of autumn harvest crops such as late rice, fruit harvesting and the robust growth of autumn sowing crops, but it is beneficial to increase reservoir water storage.

Image source: Central Meteorological Observatory

Why is the cold air so frequent when winter comes too late?

Recently, the cold air affecting China has been coming one after another. From north to south, the temperature dropped rapidly in a short period of time, and many netizens lamented on social networks that "winter was caught off guard".

For frequent cold air attacks, Sun Jun analyzed that the fundamental reason for frequent cold air processes in autumn and winter in China is the difference in thermal properties between land and sea.

"In autumn and winter, the land will form a strong high pressure and the ocean will form a low pressure. The horizontal pressure gradient force will make the atmosphere move from high pressure to low pressure. From the perspective of the climate system, the reason why cold air frequently moves southward in autumn and winter is because the subtropical system and tropical system move southward, the warm and humid airflow moves southward, and the ground cold high pressure often moves in the middle and high latitudes, so the northwest airflow guides the cold air mass to move southward. " Sun Jun said.

In the recent program "Direct Weather-Chatting with Scientists" organized by China Meteorological Bureau, Wang Yongguang, the chief climate expert of the National Climate Center, predicted the climate this winter, and said that from the previous data forecasting model and diagnostic analysis, China may still be warmer this winter. "The impact of warmer weather on air quality cannot be ignored, including the Beijing-Tianjin-Hebei and Yangtze River Delta regions, and prevention should be strengthened."

As for how to define "cold winter" and "warm winter", Ding, an academician of China Academy of Engineering and special adviser on climate change of China Meteorological Bureau, explained that climate change can be described by two parameters, one is the average temperature, the average temperature of a winter for 90 days exceeds the multi-year average, which means warm winter, and the other is cold winter, which means the average value. Another parameter is extreme events, such as sudden and violent cooling and cold wave weather within a few days in winter.

If the average value is warm winter, it does not mean that there will be strong cold events and warm events in this warm winter.

Do a good job of wind and frost prevention.