According to the forecast of the ** meteorological observatory, from February 17th to 22nd, affected by the cold wave weather, most parts of China will have a sharp cooling from west to east and from north to south, and the average temperature will generally drop by 8 to 12, and the temperature in some areas will drop by 12 to 18. Among them, the cumulative cooling range in Inner Mongolia, Northeast China, Hubei, Hunan and other places can reach more than 20.
At the same time, this process will also cause a wide range of rain, snow and freezing weather, the precipitation phase is complex, and there are strong convective weather in some parts of the south. From the 18th to the 23rd, rain will turn to sleet or snow in Northeast China, the eastern part of Northwest China, the central and western parts of Inner Mongolia, most of North China, Huanghuai, Jianghuai, Jianghan, northern and western Jiangnan, and Guizhou, and some areas in North China and Huanghuai will have heavy to heavy snowfall; There are moderate to heavy rains in the southern part of Huanghuai, Jianghuai, and the central and northern parts of Jiangnan, with localized heavy rain, accompanied by strong convective weather such as thunderstorms and short-term heavy precipitation. From the 20th to the 23rd, freezing rain or ice particles will appear in parts of Henan, Anhui, Hubei, Hunan, Guizhou and other places.
The widespread rain and snow and the sudden change in temperature are like a "roller coaster" that catches the public off guard. So why is there such a dramatic cooling?
* Zhang Fanghua, chief forecaster of the Meteorological Observatory, said that there are two reasons for the drastic cooling, the first is that the cold air from Siberia is strong, and the sea level pressure corresponding to the cold air mass is as high as 1050 hPa, and the cold temperature centers near 5000 meters and 1500 meters are as low as -48 and -32 respectively, indicating that the cold air is strong; At the same time, before the arrival of the cold wave, the temperature in most parts of central and eastern China has risen significantly, and the maximum temperature in some areas is close to or exceeds the extreme value of the same period in history. As a result, the temperature drops dramatically when a cold wave hits, and the temperature fluctuates greatly before and after the cold spell arrives.
The freezing rain and snow weather affected the return journey of the Spring Festival.
The impact time of this round of cold wave weather process coincides with the peak period of return after the Spring Festival holiday, and many warnings are issued at the same time, with a wide range of impact, and the weather situation is complex, which is very unfavorable to transportation. Li Xiaozhu, senior engineer of the Public Meteorological Service Center of the China Meteorological Administration, introduced that from 8 o'clock on February 18 to 8 o'clock on the 23rd, the large-scale freezing rain and snow weather process in the central and eastern parts of China will have an adverse impact on the return of traffic during the Spring Festival.
In addition, Li Xiaozhu said that the impact of rain, snow and low temperature weather brought by the cold wave will cause the power load in most parts of the south to be significantly higher than that of the same period in history; From the 18th to the 22nd, there is a risk of icing of transmission lines in Northeast China, Central and North China, Central China, and Eastern Southwest China, among which from the 20th to the 22nd, the icing thickness of local power lines in Guizhou, Hunan, Hubei, Anhui and other places may exceed 20 mm, which will have a certain impact on the safety of power facilities. Experts suggest that it is necessary to focus on preventing the adverse impact of road icing on the return of Spring Festival transportation, and at the same time do a good job in energy storage and allocation, power facility maintenance and ice melting preparations in advance to ensure energy safety.
In terms of health, sudden changes in temperature in a short period of time can easily induce respiratory diseases such as colds. Li Xiaozhu said that due to the influence of cold air, the northern part of Xinjiang, the central and northern parts of the northwest region to most of the central and eastern parts of China will have a higher meteorological risk of influenza, considering that the next week is still the peak time for return travel, it is recommended that susceptible people should pay attention to cold and warmth, and wear masks as much as possible in crowded places to prevent the occurrence of influenza. The public is requested to pay close attention to the latest weather forecast issued by the meteorological department, especially the elderly, children, pregnant women and other key groups should pay attention to adding clothes in time to strengthen health protection.
Be vigilant about the adverse effects of low temperature frost damage on agricultural production.
According to He Liang, deputy director of the Ecological and Agricultural Meteorological Office of the ** Meteorological Observatory, it is expected that the minimum temperature in most of the northern winter wheat areas is above -10. From the 20th to the 22nd, eastern Gansu, Shaanxi, central and southern Shanxi, southern Hebei, western and northern Shandong, western and northern Henan, western Hubei, northern Hunan and other places suffered a high risk of snow disasters. In this regard, experts suggest strengthening vegetable greenhouses, livestock and poultry sheds and other facilities, reasonably regulating temperature and humidity, supplementing light and topdressing to prevent diseases; Remove snow and ice from agricultural facilities in a timely manner.
It should also be noted that southern oilseed rape will be at risk of frost damage. From the 20th to the 23rd, the leaves of rapeseed in southern Shaanxi, Hubei, Hunan, central and southern Anhui, northern Jiangxi, Guizhou and other places may appear yellowing and whitish. From the 24th to the 25th, rapeseed in central and eastern Hubei, central and southern Anhui, central and southern Jiangsu, and northern Hunan may suffer moderate to severe frost damage, and some weak rapeseed may die after freezing.
Economic forest fruits, farmed aquatic products, poultry and livestock in the middle and lower reaches of the Yangtze River may suffer from low temperature frost damage. From the 21st to the 25th, the central and northern parts of South China will suffer from cold damage and frost damage, among which, the northern part of Guangxi, the northern part of Guangdong, and the northwest part of Fujian will suffer moderate to severe cold damage, which is easy to cause the slow growth of open-field vegetables, bananas, loquat and other tropical or **zone fruits, and suffer damage. In this regard, meteorological experts suggest that rapeseed and open-field vegetables, economic forest fruits and other cold protection and warmth work; Harvest open-field vegetables and ripe fruits, and take measures such as foliar spraying of growth regulators and straw mulching to prevent low-temperature frost damage; In rape fields, measures such as cultivating and soil cultivation should be taken to improve frost resistance, and frostbitten buds and leaves should be removed in time, and scientific topdressing should be carried out to promote their normal growth.
*: China Meteorological Administration.
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