Movement of squall line

The moving direction and speed of squall line are not only related to the high-altitude airflow, but also change with different development stages. On the evening of June 3, 2009, a rare squall line weather hit Shanxi, Henan, Shandong, Anhui, Jiangsu and other places, killing 22 people and causing direct economic losses in agriculture of more than one billion yuan. Strong convective weather occurred in Shangqiu City, Henan Province, in which the maximum wind force in yongcheng city reached 1 1, the largest wind force since the meteorological record in yongcheng city, and yongcheng city was the most seriously affected. The squall line * * * caused 22 deaths, mostly caused by the collapse of trees and houses. This is a weather phenomenon called squall line. When this weather phenomenon occurs, it is usually accompanied by thunderstorms, strong winds, hail and other processes, which are energy-intensive, destructive and difficult to predict.

On the evening of June 7, 2009, there was a strong convective weather around 10: 30 in Hefei, Anhui Province. The precipitation in 10 minutes was more than 5CM accompanied by thunderstorms, and the wind speed reached 18m/s, with the highest exceeding 25 m/s.

On the evening of June 14 to 2 1: 27, and in the afternoon of June 14, seven people were killed (including six Lingbi) and eight injured1/kloc-0. Thunderstorms and strong winds in Tongzhou City, Jiangsu Province caused 1 death. From August 27th, 2009 16: 50, affected by the squall line system, thunderstorms and windy weather occurred in many places in Liaoning. Although the meteorological department issued a yellow warning signal for lightning in time to remind the public and relevant departments to pay attention to the coming thunderstorm and gale, three people were killed and more than one person was injured. In addition, during the squall line, the communication and network in Jinzhou City were temporarily interrupted. On the afternoon of the 27th, there was a thunderstorm and windy weather in central and western Liaoning. Due to insufficient water vapor conditions, the rainfall is not large, but the wind is very strong. Among them, the wind speed in Shenyang is the largest, reaching 9.5 m/s, which is equivalent to the wind level 5. The instantaneous wind power at individual locations even reached level 8. Trees and billboards blown down by strong winds caused many casualties.

In South Sanjing Street, Shenyang, a tree with the thickness of a bowl was scraped off (Source: Liaoshen Evening News)

According to Liaoshen Evening News, on 27th 15: 45, Liu Jingxian and his wife, a villager from Datuozi Village, Zhoutuozi Township, xinmin city, Shenyang, rode a motorcycle and were hit by a dead tree struck by lightning and never came back. According to an eyewitness, the wind was very strong at that time, and the fallen dead trees hit the passing runners, and the trunk was pressed on their chests. People were dying at that time, and two dead trees could add up to 20 meters long. Subsequently, the funeral car of the civil affairs department sent the couple's body to the funeral home.

The broken dead tree knocked down a couple riding a motorcycle (Source: Liaoshen Evening News)

/kloc-at about 0/6 o'clock, a 26-year-old boy was smashed outside a construction site near Shenyang North Station and sent to the Fourth People's Hospital of Shenyang for rescue and died. According to 120 emergency personnel, when they arrived at the incident site, the young man had stopped beating. At that time, a billboard about 6 square meters in size smashed the telephone pole first, and then smashed it at the young man. According to local media reports, the young man just went to work 1 many months ago, and it happened on his way home from work. As he is still on probation, the young man's company has not paid insurance for him.

Due to the late peak of thunderstorm, objects blown by strong winds also injured 10 many citizens who had no time to escape, and one seriously injured woman was still being rescued.

Previously, Jinzhou City also suffered from strong convective weather. 15 or so, the sky over Jinzhou suddenly became overcast, and it soon became dark. A few minutes later, it began to rain cats and dogs, and the day was like night. Dark clouds, strong winds, showers and abrupt weather caught the public off guard. At the same time, communication and network are temporarily interrupted.

Jinzhou City also suffered from strong convective weather (Source: Liaoning Daily)

Jiang Dakai, chief forecaster of Shenyang Central Meteorological Observatory, said in an interview with this website that the severe convective weather process started around 14 on the afternoon of 27th and ended around 20: 00. From the radar image analysis, this is a squall line. Strong convective weather affects a wide range, except southern Liaoning, Dandong and Dalian. Usually, there are many squall lines in June, but it is rare to see such a large-scale squall line in Liaoning in late August.

Meteorologists explained that there is a narrow wind shear zone when cold and warm air flow meet, which will bring extremely strong convective weather when crossing the border. Lightning, hail, thunderstorms and strong winds are all products of strong convective weather, but on the 27th, lightning and hail did nothing, only strong winds showed their power. This is because the wind power in some areas is greatly influenced by the terrain, and there are many high-rise buildings in the city, which is easy to cause the wind power in some areas to be stronger than that in the surrounding areas.

Strong winds rolled up asbestos shingles and planks on the roof, injuring three passers-by (Source: Liaoshen Evening News)

After a thunderstorm, the highest temperature in Shenyang on the 28th will be only 22℃, 7℃ lower than the previous day. Especially in the morning and at night, the cooling will be more obvious, and the minimum temperature will drop to 10℃. From 29th to 3rd1,the temperature in all parts of Liaoning rose slowly. According to Yang Guang, official website, china national radio. Com, 6. 1 The capsizing of the Oriental Star tourist passenger ship is a particularly catastrophic event caused by a gale and rainstorm caused by a rare sudden and rare strong convective weather (squall line with downburst).