When will the extreme weather continue to "southern rainstorm+high temperature in the north"?Expert explanation

Jimu Journalist Li Xiancheng

Recently, netizens in the south and north felt completely different summer.

The southern region continued to be affected by strong rainfall. Especially in the three and a half months of the three and a half months, the average precipitation of the region of Fujian, Guangdong, and Guangxi reached 621 mm, which was the largest in history since 1961.

The land in the north is continuously burned at high temperature, and the maximum temperature in many places can reach about 40 ° C, and the degree of heat is rare during the same period. On June 18, the top ten temperature rankings in Henan and Hebei provinces.

Why is there such an extreme but opposite weather in the north and south? When will such weather continue? Some meteorological experts analyzed to Jimu Journalists that the weather in recent years is indeed a bit abnormal compared with the same period of previous years. He also analyzed the reason at the same time.

The rainfall of the three provinces in the south is the most 60 years old

For more than a month, the southern region has continued to be affected by heavy rain. According to data from the National Climate Center, from May 1st to June 15th, the precipitation volume of most South China, most southwest, southern East China, southern Hunan, and eastern Tibet compared with the same period of the same year. Among them, the average precipitation of the regions of Fujian, Guangdong, and Guangxi reached 621 mm, which was the largest in history since 1961.

The rainfall since May in the southern region of my country (Picture Source:@我 我)

Affected by the large -scale heavy -scale precipitation, flood disasters occurred in many places in South China and Jiangnan, and a super police flood occurred in 117 rivers in the Pearl River Basin. The central urban area of ​​Guangzhou appeared in the climax of over 100 years on June 15, and all passenger routes in the urban area were suspended.

According to CCTV news reports, at 7:30 on June 18, a flood disaster occurred in the ancient capital village of Xiangfen Township, Rongshui County, Liuzhou City, Guangxi, and a house was destroyed.

Songxi County, Nanping City, Fujian has also encountered heavy rainfall attacks since the 18th. According to the statistics of the meteorological department, as of 6:00 on the 19th, the 24 -hour rainfall of Songxi County exceeded 200 mm. Local town was flooded, and personnel were urgently transferred.

On June 18, Songxi County, Fujian encountered floods (Picture Source: CCTV News)

According to the official Weibo news of the China Meteorological Administration, from June 19th to 21st, there were heavy rains near the middle and lower reaches of the Yangtze River, Jiangnan, South China, and southern Guizhou. Wait for strong convection weather.

Why is the rainfall in the south so strong and durable for a long time? According to Wang Weiyue, a meteorological analyst of China Weather Network, since May, the subtropical high -pressure position has been relatively stable since May, helping the warm and humid air flow to Jiangnan and South China. At the same time, the northern multi -cold vortex activity prompted cold air south. The cold and cold air meets over South China and other places. The two sides are deadlocked within a certain range and launched a tug -of -war. Therefore, there is a situation of continuous rainfall in the same area. The fierce confrontation between the cold and cold air flow has also greatly enhanced the probability of the emergence of heavy rain and increased the extremes of rainfall.

The surface temperature on one area of ​​Henan reaches 74.1 ℃

In northern China, it is another scene. Recently, high -temperature weather in North China has appeared in a large area. The core area is located in Henan, Shandong, and southern Hebei. Many places can reach about 40 ° C in many places.

The forecast of the National High -Temperature Surgery area from 8:00 on June 19th to 20:00 (Picture Source:@全 全)

According to CCTV News, on June 16, the maximum temperature of 52 counties and cities (more than 40 % of the province) in Henan reached 40 ° C to 42 ° C, and the highest was 42 ° C in Linzhou. Zhengzhou became the first among provincial capital cities this year 40 ° C; in addition, the dance steel and mall refreshed the highest value of the local June in June. On the day, the highest temperature of the 92 stations in Henan exceeded 60 ° C, the highest surface temperature of the 8 stations exceeded 70 ° C, and the surface temperature of Xixia Station reached 74.1 ° C as the highest in the province.

Zhengzhou, Henan, not only heat during the day, but also the heat of the heat at night. The lowest temperature (29.6 ° C) refreshed the lowest value of the local minimum temperature in June. The outdoor operation has been stopped on the 19th. The Henan Provincial Department of Water Conservancy said that Henan has reached the level of mild drought.

Zhengzhou, Henan stopped outdoor open -air operations on the 19th (picture source: CCTV screenshot)

Not only did Henan heat become "Konan", but Hebei has also become "Kebei". From 3:00 on June 18th to 2:00, Hebei exceeded 40 ° C in many places, and the top ten cities in the temperature ranking accounted for 7 seats. Recently, the red high -temperature warning has been issued in many places in North China.

June 18th to 02:00 on the 19th (picture source: Central Meteorological Observatory website)

The high temperature process of this round has a wide range of influence, strong intensity, and a long duration. Why is it so hot? According to China Weather Network, Meteorological Analyst Shi Yan said that due to the influence of the high -pressure ridge east of the mainland, the northwest dry thermal gas group moved eastward to Henan. At the same time, the bottom of the south wind was strengthened to the north. It will increase rapidly. In addition, the duration of the heating and high pressure spine is long, which leads to the long temperature duration of this round of high temperature, and the ground continues to accumulate heat, so that the heat is "increased" based on the original basis.

Expert: Compared with previous years, some abnormalities

Is the recently formed "southern flood and north drought" climate phenomenon, is it normal compared to the same period of previous years? What are the main reasons for forming this kind of weather?

On June 19, Li Guoping, a second -level professor of meteorological experts and a second -level professor of Chengdu Information Engineering University, told Jimu Journalists that during this time, "the weather in the south and the north and the strong convection in the north" was a bit abnormal compared to the same period of previous years. "The main reason may be related to the weak summer wind and the high pressure of the Western Pacific subtropical high pressure north. At the same time, the cold air in the north is related to active. As a result, the rain belt has stagnated in the south for a long time and the north is slow." Li Guoping explained. However, with the changes in climate, the weather in the north and the south may change. According to the China Meteorological Administration on June 19, around the 23rd, high -temperature weather in the northern region will occur shortly; after 22, high -temperature weather will also appear in parts of Jiangnan and parts of South China.

In addition, the main rain belt will be lifted north. From 22nd to 24th, there will be heavy rain in the east of the Northwest, the south of the northeast, Huanghuai, Jianghuai, and the northern part of the river. There will be heavy rain in the local area, and it will be accompanied by strong convective weather such as short -term heavy precipitation and thunderstorms. Around the 27th, there will be a relatively obvious rainfall process in the east of the Northwest, the southern part of the North, the southern part of the North, the southern part of the northeast, the Huanghuai, the Jianghuai, the west of the south and the southwestern region.

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