Why doesn't it snow in Beijing

Chen Dagang, chief of the Climate Analysis and Prediction Section of Beijing Meteorological Bureau, said with a smile when interviewed by this reporter that the most frequently asked sentence is "Why doesn't it snow in Beijing?"

Wang Xiao, reporter of Outlook Oriental Weekly

According to Weibo, "all winds that don't aim at snowing are hooligans", then from the winter of 20 10, Beijing has been "hooligans"-the lowest temperature dropped to MINUS 1 1.6 degrees Celsius, and flights were cancelled in windy weather, but it was not until 20165438.

While the low temperature rain and snow weather in the south continues to appear, the drought in North China is also attracting attention. According to media reports, the drought degree in Shandong, the second largest wheat producing area in China, has reached the standard of once in 60 years. 20 10 Since September 23, the cumulative average precipitation in Shandong Province has been 1 1mm, which is 86% less than that in the same period of normal years. There are 60.95 million mu of farmland in the province suffering from drought.

According to the observation data of Beijing Meteorological Observatory, there has been no effective precipitation in Beijing since 20 10/October 25th, and it has been 93 days.

"This year, Beijing is likely to break the record of the latest snowfall in 60 years." 65438+1On October 24th, Chen Dagang, chief of the climate analysis and prediction section of Beijing Meteorological Bureau, told Outlook Oriental Weekly.

Because 195 1 has a complete meteorological record, the latest time of the first snow in Beijing is 09841October 29th, 65438+65438. Judging from the data currently monitored by Beijing Meteorological Bureau, there is still no sign of snow in Beijing at least before 1 ends.

Abnormal atmospheric circulation causes no snow in Beijing.

"Why doesn't it snow in Beijing?" 20 1 1 at the beginning of the year, a netizen threw out such a question and wittily gave four options: a, I can't go without a Beijing hukou; B, the rent in Beijing is too expensive to afford; C. Don't dare to get off the bus in case of leadership travel and traffic control; D. I haven't paid enough taxes and endowment insurance for five years, and I can't shake the number.

This joke quickly became popular on the Internet.

Chen Dagang, chief of the Climate Analysis and Prediction Section of Beijing Meteorological Bureau, said with a smile when interviewed by this reporter that the most frequently asked sentence is "Why doesn't it snow in Beijing". His analysis is abnormal atmospheric circulation.

"The reason for the late snowfall is very simple from a meteorological point of view, that is, there is no warm and humid airflow. Snowfall should be accompanied by sufficient water vapor conditions, and the intersection of cold and warm air masses is the place with the most rain and snow. No one can control it unilaterally, and there will be no precipitation. After the winter of 20 10, the cold air quickly controlled the northern part of China, but the warm and humid airflow was delayed. Another condition that needs to be met is updraft, which can collect water vapor. If there is no such mechanism, even if there is precipitation, it may be a flash in the pan. "

Buhe Lu Chao, a researcher at lasg, believes that the deeper reason lies in the abnormal polar vortex activity and "La Nina phenomenon". "Under the influence of these two factors, since the winter, the high-pressure belt formed by the Ural Mountains and the North Pacific Ocean has transported cold air to the south very stably, resulting in the whole North China being under the control of the northwest airflow, and the warm and humid airflow in the south can't pass."

20 10 12.29, Snowflake hit a "edge ball" in the northwest of Beijing. Later, some netizens said that they saw something similar to "dandruff" floating near the North Fourth Ring Road. In the opinion of meteorologists, such snowfall belongs to boundless snowfall and cannot be called the first snow.

Chen Dagang explained that the conditions for the first snowfall in Beijing are that all five meteorological stations in Chaoyang, Haidian, Fengtai, Shijingshan and Nanjiao Observatory have observed snowfall, or more than three of these five stations have observed snowfall, and at least 1 station has detected snowfall greater than 0. 1 mm.

"It is possible that it will not snow all winter."

For people living in Beijing, winter without snow is obviously a little uncomfortable.

"In Beijing, it will definitely snow in winter. This is a fixed mode of thinking for everyone." Chen Dagang said that in fact, the average winter precipitation in Beijing only accounts for 2% of the whole year, which is a seasonal drought. "We usually talk about abnormal precipitation and temperature. In terms of precipitation, there is no rain or snow for more than three months, which can be called abnormal, but the temperature is not abnormal. Although everyone feels cold, in fact, the average temperature in June is only 65438+ 10, which is lower than normal, and the low range exceeds 1 Celsius. If we compare 65438+February, it is less than 1 degree Celsius lower than normal. But it is extremely low, generally referring to two or three degrees Celsius lower. "

Numerically, compared with the extremely cold climate in 2009, the temperature in Beijing this winter is moderate. On June 6th, 65438 10, the temperature in Beijing dropped to-16.7 degrees Celsius, breaking the record of the lowest extreme temperature of 65438+ 10 in early October in 38 years. This winter, as of 65438+1October 25th, the lowest temperature was only-1 1.6 degrees Celsius. Chen Dagang believes that this year's cooling is purely caused by cold air. "If it snows once or twice, the temperature will probably be lower than in the winter of 2009. The reason why people feel cold is because Beijing has been warm for more than ten years before 2009. "

According to statistics, during the same period 1970~ 197 1, there was no obvious precipitation in Beijing for consecutive days 1 16, and the precipitation in Beijing plain was only 0.6 mm, followed by 65438+20081October 24.

"It's possible that it won't snow all winter," Chen Dagang thought, but according to the situation of these decades, it will rain more or less.

Wen, former director of China Meteorological Bureau, told this reporter that if there is no snow in the future, there will only be sleet. "Now it seems that the record of the latest snowfall in the early 1960 s was immediately broken."

Different "Freezing" in South China

Since the beginning of winter, the snow, freezing and low temperature in southern China have been rare, and the so-called "extreme cold once in a thousand years" has been mentioned again.

Zhou Fancai, a reporter from Outlook Oriental Weekly, reported.

65438+1October 20th, 20th11On the first day of Spring Festival travel rush, another great migration with China characteristics began. Liu Bin, a junior at Huazhong University of Science and Technology, also chose to go back to his hometown in Hunan on this day, and made an appointment with his classmates in Changsha to eat hot pot at the famous Fire Palace in the evening.

Tickets are not difficult to buy. After the opening of Wuhan-Guangzhou high-speed railway, the train tickets from Wuhan to the south, which used to be sought after by Spring Festival travel rush, were obviously abundant. But Liu Bin forgot that a heavy snow was raging in his hometown.

The severity of the snow situation prompted the Wuhan-Guangzhou high-speed railway to slow down. According to the news from Wuhan Railway Station, the No.52 high-speed train originating from Wuhan Railway Station was delayed due to the snowstorm in Hunan on the 20th.

Nearly two hours later, Liu returned to Changsha. At that time, the heavy snow continued, and there was snow everywhere in Star City.

Since the beginning of winter, the snow, freezing and low temperature in southern China have been rare, and the so-called "extreme cold once in a thousand years" has been mentioned again.

Hunan: Snowfall once in 40 years.

The rare snowstorm that Liu Bin caught up with started at 17 and lasted for three or four days.

According to the local meteorological department in Hunan, the snowfall has reached the standard of once in 40 years, causing nearly 10 million people in all 14 cities and counties in the province to be affected, with snow in 80 counties and cities and freezing in 38 counties and cities; The depth of snow in Taojiang, Anhua and Yiyang 10 counties and cities broke records; The depth of snow in eight counties and cities such as Changsha reached the second place in the historical record, causing direct economic losses of more than 3.5 billion yuan.

At the same time, the freezing range in Hunan Province is also expanding rapidly. Within one day, the freezing range expanded from 1 county and city on 18 to 22 counties and cities in the province.

Teacher Zeng Zhihua, who lives in the dormitory building of Changsha University of Science and Technology, is distressed by this. On the 22nd, the clothes originally hung on the balcony actually froze, so she had to hang them in the air-conditioned room.

Zeng Zhihua told Outlook Oriental Weekly that nearly a week after the heavy snow, the snow on the roadside, roof and flower beds on the campus of Changsha University of Science and Technology has not melted. "Seven or eight centimeters thick, it is difficult to step on."

People in Hunan are no strangers to freezing. On New Year's Day before this round of blizzard, as many as 62 counties and cities in Hunan Province were frozen, of which Jingzhou County in Huaihua had a freezing thickness of 6.5 mm. The earlier memory occurred in the winter of 2008, when a rare freezing disaster swept across the province, paralyzing many traffic arteries running through the province, such as Beijing-Guangzhou Railway and Beijing-Zhuhai Expressway.

While Hunan suffered from heavy snow, its neighbor Jiangxi was not spared. According to local meteorological data, since the early morning of June 65438+1October 18, there have been 70 counties (cities, districts) in central and northern Jiangxi Province, of which 62 counties (cities, districts) are pure snow, and 49 counties and cities have successively experienced snowfall. The Jiujiang section of the Yangtze River was suspended for three hours after the blizzard hit Jiujiang for two consecutive days.

This is not the first heavy snow in Jiangxi since winter. On New Year's Day, snowfall or sleet occurred in 75 counties and cities in Jiangxi, and snowfall occurred in 56 counties and cities in northern and central Jiangxi, among which the snow on Lushan Mountain was 14 cm thick.

Guizhou: The freezing is coming.

Because of the freezing, Gong Lianhu saw the power of Weibo.

He is an assistant to the head of Dangwu Township, Huaxi District, Guiyang City, Guizhou Province. Due to the cold, rainy and snowy weather that lasted for nearly 20 days, many poor villagers in this area have no cotton-padded clothes to keep out the cold. Gong Lianhu posted on Weibo for help and received enthusiastic support from countless netizens. On June 22nd, 65438 alone, 236 cotton-padded clothes and 22 quilts were collected.

Gong Lianhu told this reporter that as early as 1.2, the local area suffered from freezing weather, and the lowest temperature reached MINUS 8 degrees Celsius. There are 658 poor households in the township, 1989 people. Without cotton-padded clothes, many old people fell ill with a cold.

Freezing, also known as freezing rain, is a mixture of snow, ice and rain under the action of strong cold air, which is called "landing into ice". Guizhou is located in the northeast of Yunnan-Guizhou Plateau, with an average elevation of 1 100 meters. When the winter wind prevails, the cold air from north to south is blocked by the plateau topography, which is easy to form this meteorological disaster. Freezing is also one of the major disastrous weather in Guizhou, with the highest frequency in China.

According to the latest news from the meteorological department, on June 26, 65438, Guizhou ushered in freezing weather, which was the fifth round of such weather since the local winter.

Weining Yi, Hui and Miao Autonomous County, located in the northwest plateau of Guizhou, is one of the most severely affected areas in Guizhou. Since June+10/October 13, 65438, there has been heavy snow in Weining, and the temperature has been 7-8 degrees below zero. According to the staff of the Propaganda Department of the County Party Committee, the freezing weather has a wide range of cooling and a wide range of snow condensation, which lasts for a long time. "It is rare in 50 years."

In Huangguoshu Waterfall, a national 5A scenic spot adjacent to Weining, people used to come and go on the road a few miles away from the entrance of the scenic spot, but after the last round of freezing rain and snow around June 5438+1October 20, there were no foreign tourist vehicles in the scenic spot. 2 1 2 pm, a reporter visited and found that the waterfall restaurant in perfect angle, a waterfall in the scenic spot, was empty.

The temperature in most parts of the south is obviously lower than in previous years.

On October 24th, 65438/KLOC-0, Wang Yihua, a lawyer from Suzhou, Jiangsu Province, who had not seen heavy snow for many years, felt the biting cold while enjoying the joy. She had to drive specially to buy a down jacket, only to find that the price of a down jacket she liked last year had risen from around 800 yuan to 1500 yuan, and one of her classmates complained to her in Weibo that she was carrying 1000 yuan.

Since June 65438+ 10, the temperature in Jiangsu province is obviously lower than normal. From the early morning of 18, snowflakes began to float in southern Jiangsu, and the tolerable "dry and cold" in Wang Yihua turned into biting "cold". According to the statistics of meteorological data, the average temperature in Jiangsu has been higher than 0℃ since 1978, and it has only been-1.0℃ since 201year, the lowest in the past 30 years, and the fourth time since 196 1 year.

The eastern coast of Zhejiang was also hit by this round of blizzard. 654381October 20th, Hangzhou Meteorological Observatory upgraded the yellow warning of blizzard to the orange warning of blizzard. By 7 o'clock that night, the snow depth in the north-central part of Hangzhou had reached 1 1 ~ 20cm, and the average temperature in June 1 was more than 3℃ lower than normal.

65438+ 10 20, the streets of Shanghai are also wrapped in silver. At 7: 50 am on the same day, the Shanghai Central Meteorological Observatory issued a yellow warning signal for blizzard and a yellow warning signal for road icing.

Since June 5438+ 10, there has been a continuous low temperature in Shanghai. Even enthusiastic citizens found that some rivers in Shanghai were frozen. Local meteorologists confirmed that this was the first time since 199 1. According to meteorological data, in the first 20 days since June 65438+ 10 this year, the average temperature in Shanghai was only 1.7℃, far lower than the normal 4.3℃.

Lingnan, which has always had a pleasant climate, is also suffering from a long period of cold wind and rain this winter. As early as 20 10, 12 and 14, sub-zero weather occurred in parts of northern Guangdong, and the temperature in mountainous areas in northern Shaoguan and Qingyuan in Guangdong once dropped to-1℃ ~-2℃.

For this reason, 97 cities and counties in Guangdong Province once issued cold warnings, including 54 cold orange warnings (that is, the minimum temperature will drop below 5℃) and even cold red warnings (that is, the minimum temperature will drop below 0℃) in Lianshan, Yangshan, Lianzhou and Liannan.

20 10, 10 Since the early morning of February 25th, the Beijing-Zhuhai North Expressway, the main traffic artery in Guangdong Province, has been cooled below 0℃ for six consecutive times.

Previously, at 20 10, 12 and 16, the road section experienced the most severe freezing this winter, and road traffic was temporarily suspended. During the ice disaster in 2008, the road surface was completely paralyzed by ice, which has been the main battlefield of winter ice resistance in Guangdong Province.

According to the statistics of Guangdong Meteorological Department, the average temperature in Guangdong Province was 9.8℃ from 2010 65438+February 25 to 20 20 10 65438+2+10/2, which was 3.8℃ lower than normal.

At present, except Yunnan, the temperature in most parts of the south is significantly lower than in previous years. Guizhou, Guangxi, southern Hunan and other places are more than 4℃ lower. On October 22nd, 65438/kloc-0, the average temperature in Guiyang was only-1.6℃, setting a record for the lowest average temperature in the first 22 days of June 1 year.