China News Network, Beijing, March 26th. The cold wave came fiercely, allowing people in many areas to experience the temperature switch of "going back to the pre-Chinese New Year night". At present, two meteorological warnings of cold wave and strong convection are issued together! According to meteorological forecast, under the influence of strong cold air, from the night of 25th to 28th, the central and eastern regions will usher in strong winds from north to south, and the temperature drop in some areas may reach more than 12 ° C. At the same time, there will be large-scale precipitation.
Data map: On March 23, snow fell in northern Xinjiang, and residents traveled in snow. Photo by Meng Ruili
Before returning to the Spring Festival overnight, the temperature in the north will be cut.
Recently, the rising temperature has made people feel that spring is strong, but the coming cold wave will interrupt this momentum.
The Central Meteorological Observatory predicts that, due to the strong cold air, from April 25 to 28, most parts of the central and eastern regions will experience 4 to 6 winds and gusts 7 to 9; the temperature will drop 6 to 10 ° C, and some areas will cool down. The range can reach above 12 ℃.
On the morning of the 28th, the minimum temperature in central and northern Hebei, most of Beijing, and most of Shanxi will drop to 0 ° C or below; on the 29th, the lowest temperature in Huanghuai, Jianghuai, Jianghan, and most of Jiangnan will be 4-9 ° C. The Central Meteorological Observatory continued to issue cold blue warnings at 18:00 on March 25th.
From the perspective of specific places, the night of the 25th to the 26th, Beijing will see a sharp drop in temperature, the drop may reach or exceed 10 ° C, and the temperature will be cut. The Beijing Meteorological Observatory issued a strong blue warning signal at 10:45 on the 25th: It is estimated that there will be northerly winds of magnitude 4 and 5 and gusts of magnitude 7 and 8 in most areas of Beijing from 00:00 to 23:00 on the 26th.
On the 26th, Hebei will also experience a significant drop in temperature. The maximum temperature in the northern region has dropped to single digits, and the local temperature drop may be close to 20 ° C. After cooling down, the temperature will gradually rise in various places, but the overall performance is sluggish.
Data Map: Photographed by Chen Guanyan, a pedestrian running in the rain
Strong convection weather hits heavy rain and hail
With the arrival of cold air, the central and eastern regions will also usher in precipitation.
According to the Central Meteorological Observatory, from the night of the 25th to the 27th, there will be a significant precipitation process in most of the central and eastern regions. Among them, parts of the eastern part of the southwestern region, southern Huanghuai, Jianghuai, Jiangnan, and most of southern China have moderate to heavy rain, local heavy rain or heavy rain, and strong convective weather such as thunderstorms or hail.
In addition, there will be light to moderate rain or sleet in central and eastern Inner Mongolia, most of the northeast region, and northern China, and heavy snow in central Inner Mongolia.
Among them, in northern Guangxi, northern Guangdong, central and northern Guizhou, western and central eastern Hubei, central and southern Anhui, northern Zhejiang, Shanghai, western and southern Jiangsu, etc. There are short-term heavy precipitation weather, the hourly rain intensity is 20-40 mm, and the local area can reach more than 60 mm.
In addition, there will be 8 to 10 thunderstorms in the northwest of Guangxi, the middle and northwest of Guizhou, southeast of Chongqing, southeast of Hubei, north and west of Hunan, northwest of Jiangxi, south of Anhui, south of Jiangsu, and west and north of Zhejiang. Gale or hail weather. The Central Meteorological Observatory continued to issue blue warnings of strong convective weather at 18:00 on March 25th.
Image source: Central Meteorological Station
Meteorologist: It's normal for us to have a cold wave in March
The spring in March suddenly ushered in a cold wave. Is this normal? Is it "cold spring cold"? Sheng Jie, deputy chief forecaster of the Strong Weather Forecast Center of the Central Meteorological Observatory, explained this.
The cold weather in spring means that after the spring, after the weather warms up, a strong cold air comes again, resulting in low temperatures. In the process of the impact of strong cold air, the temperature in the southern region has risen significantly and the temperature has been significantly higher. After the cold air came down, the temperature drop was larger.
Judging from the time of the cold wave, Sheng Jie said that in the past five years, the cold wave warning was issued in mid-March for three years. In March and April of each year, cold air activity in China is relatively frequent, and it is in the transitional period of winter and summer monsoon, but it is still a period mainly dominated by winter monsoon. The weather gradually began to warm, but the cold air in the north was still active. In such a climatic background, the cold and warm fluctuations are likely to be very large.
Statistics show that the cold or strong cold air activities that affect China have a relatively high frequency in November, December, March, and April.
The cause of this strong cooling is on the one hand the strong cold air going south, and on the other hand, the temperature in most parts of central and eastern China was significantly higher in the early stage, and some places exceeded the extreme value of the same period. , The change in temperature will be even greater. The combination of these two factors caused this strong cooling.
Data map: On March 25, Guangxi ushered in precipitation. The picture is taken by Lin Hao, a blown-down tree
Pay attention to the effects of strong convection weather when resuming work and production
Cold waves and strong convective weather will adversely affect human health, crop growth, transportation, power supply, forest and grassland fire prevention, etc., and may also cause secondary disasters. What should we pay attention to when we resume work and resume production?
Sheng Jie said that after the resumption of work, there will be more travellers, pay attention to slippery roads, especially in the morning and evening peak periods, pay more attention to near-term forecasts, and pay attention to traffic safety; pay attention to covering building assets at the construction site, and properly arrange those vulnerable to rain and hail Outdoor items; check the drainage systems of cities, farmland, and fish ponds, and prepare for drainage and defense against disasters such as flash floods, landslides, and debris flows.
At the time of spring ploughing and spring sowing, rainfall in the spring sowing areas in southern Jiangnan and northern South China was unfavorable for early rice planting and seedling raising. In particular, local thunderstorms, high winds, hail, and heavy rainfall are not good for early rice seedlings and dryland crop growth. Jiangnan and northern South China have not yet planted early rice to avoid the influence of cold air, and delay the sowing of seedlings. In areas already sowed, do a good job in strengthening and maintaining the temperature of greenhouses.
In dryland agriculture and direct seeding of early rice, thermal insulation measures should be taken in time to reduce the harm of cooling. The southwestern region has strengthened spring sowing and spring management, taking advantage of current rainfall opportunities to timely plant and fertilize, and promote the steady growth of spring sowing crops and the formation of winter wheat rapeseed. Moisture deviation in the agricultural area should be timely seeding, seedling investigation and replanting to ensure that Miao Qi Miao Zhuang.
The spring sowing area in the northwest region needs to do a good job of preventing cold and frost of the sown crops and economic forest fruits. Most areas in the south should do a good job of disease and pest monitoring and unified control and control to reduce the possible risks. The strong winds in the central and eastern regions and the snowfall in parts of the northeast are not good for facility agriculture and animal husbandry production, and will increase the cost of thermal insulation and cold protection. (Finish)