News related to hail disaster

Flight 30 at Baiyun Airport is delayed.

At 9: 40 on the 20th, Baiyun Airport was affected by the continuous thunderstorm in Guangzhou. As of 16, 30 flights were delayed by more than 1 hour, and 10 flights were diverted to neighboring airports due to weather.

Baiyun Airport launched a blue warning of large-scale flight delay on 20th 14: 40. 15 or so, the weather improved and cleared up, and flights resumed taking off and landing. As of press time, Baiyun Airport is operating in an orderly manner. An old tree with hail as big as an egg was cut off.

At 5 o'clock in the morning on the 20th, strong convective weather such as thunderstorm, gale and hail "combined boxing" hit the mountainous area of northern Guangdong, and the county seat of Renhua County in Shaoguan City and the towns and villages such as Hongshan, Shitang and Chengkou were seriously affected. The strong wind brought by egg-sized hail has seriously damaged the power and communication facilities in some places, affecting the villagers' electricity consumption. In some areas, the cell phone signal was once interrupted, and a thousand-year-old tree was also broken by the strong wind.

Gaoping Village, Hongshan Town, Renhua County belongs to the "hardest hit" of this severe convective weather. The roofs of tile houses in more than 60 villages in the village were damaged to varying degrees, or smashed by hail or overturned by strong winds. After the storm, the whole Gaoping village was in a mess and the ground was covered with rubble.

"At five o'clock in the morning, it began to rain heavily, with thunder and lightning and strong winds. There was a crackling sound on the roof, and then the tiles broke, only to see hail falling into the house. " A villager in Gaoping Village revealed that the wind blew for half an hour, and the biggest hail that broke the roof and smashed into the house was the size of an egg, which made the villagers very scared. On a mountain behind Gaoping village, a large Chinese fir forest was also blown down by the strong wind.

The telephone poles in some villages hit by strong convective weather were blown down by the wind, and the power and communication facilities were seriously damaged. Power supply and communication in villagers' homes in Zhongshan Village, hongshan town were interrupted, and cell phone signals temporarily "disappeared" in some areas.

On the morning of the same day, in a farm in Danxia Street, the strong wind overturned 16 pig houses in the farm, 120 pigs were pinned down by collapsed asbestos tiles and wood, and 100 kg pigs got into the fish pond through the gap between the tiles and wood. Huang, the owner of the farm: When the strong wind struck, the wind suddenly increased, and the rain poured down, and an electric room next to the pigsty collapsed instantly.

At the same time, Renhua County also suffered from strong convective weather, and many green trees and outdoor facilities of residential buildings were damaged. A thousand-year-old tree with a diameter of more than two meters in Tianling Village of Danxia Street was also blown down.

According to Renhua Meteorological Observatory, the severe convective weather was affected by the south branch trough at high altitude and weak cold air. From 5: 30 to 6: 05 on the 20th, strong convective weather such as short-term thunderstorms and strong winds occurred in various towns and villages in Renhua County. Among them, Renhua County, Yangtze River, Dong Tang, Wenshao and other places reached windy weather, especially Renhua County recorded a rare instantaneous wind force of 41.5m/s.

According to the statistics of relevant departments in Renhua County, affected by short-term strong convective weather, 25 village committees and 2 10 villagers' groups in 6 towns including Chengkou, Fuxi, Shitang, Hongshan, Huangkeng and Dong Tang were affected. As of 20th 10, the disaster * * * caused a direct economic loss of about 3.5 million yuan, 382 houses 1 146 watts were damaged, 150 solar energy was damaged, 17 highway collapsed 68 meters, and 40 mu of bamboo was blown down. There are no casualties at present.

More than 50,000 users lost power.

Since 5: 00 a.m. on the 20th, most areas in Shaoguan City, Guangdong Province have been hit by short-term thunderstorms and strong winds, with hailstones (with diameters of 4 cm and 0.8 cm respectively) in Lechang and Renhua, and the instantaneous maximum wind speed in Lechang Lion Mountain and Renhua County reached 4 1.5 m/s (14). In most areas of Lechang, strong winds of magnitude 8 or above occurred in many places on both sides of low-voltage power supply lines, causing 54 lines in Shaoguan 10KV to trip, 37 poles in Shaoguan10 kV and below to fall, and 1044 low-voltage stations were affected, resulting in power outages for more than 50,000 users. More than 700 emergency repair personnel from Shaoguan Power Supply Bureau rushed to the disaster site to step up emergency repair. By 20 19: 00, all the power outage areas affected by strong winds resumed normal power supply.

Beijing-Zhuhai North Road is slippery and slow down.

During the spring equinox, there will be more and more rainfall, and Beijing-Zhuhai North will also face a severe test. According to the forecast of the meteorological department of Shaoguan City, Guangdong Province, there will be moderate to heavy rain in the north of Beijing-Zhuhai in the near future. The continuous rainy and foggy weather will cause the high-altitude steep slope road in Beijing-Zhuhai North to be slippery, and the traffic safety of Beijing-Zhuhai North Road will be tested.

The slippery road surface is slippery and the sight is not good, and the effective sight even drops to about 100 meters at night. According to the statistics of the traffic police department, since March 19, there have been three consecutive minor traffic accidents such as collision with guardrail and rear-end collision of cars in Beijing-Zhuhai North. Although no casualties were caused, the bad weather of rain and fog still brought difficulties to the traffic management of drivers and traffic police departments.

The traffic police department reminded that when driving in a foggy area nearly 20 kilometers north of Beijing-Zhuhai in heavy rain and fog, it is advisable to slow down and increase the distance between cars, and it is advisable to drive more than twice the distance on dry roads; In rainy and foggy weather, it is also necessary to reduce the frequency of lane change, and it is not advisable to slam the brakes or slam the steering wheel.

Driving in the dangerous downhill section of 20 kilometers north and 20 kilometers north of Beijing-Zhuhai, it is easy to accumulate water in the low-lying part of the ramp or near the bend. Vehicles are prone to "water slip" and "drift" when passing through water-logged sections at high speed. The traffic police reminded that special attention should be paid to controlling the speed when encountering stagnant water. Due to thunderstorm and hail, the shed collapsed and seven people were slightly injured.

At about 0/7 o'clock on the 20th/kloc, a movable board house at the construction site of Million Flower City, Jiangjun Road, Qiuchang Street, Huiyang District, Huizhou City collapsed due to thunderstorm and windy weather, causing 7 minor injuries. The injured left the hospital that night after being sent to hospital for treatment.

According to Lao Liu, a construction worker who escaped from the board house at that time, he stayed in the board house to rest after finishing his work that afternoon, while most other workers were still at the construction site until 17: 30. At this time, suddenly it was dark and the wind was blowing hard, and soon it rained heavily, mixed with hail. Soon he felt that the board house could not hold up, so he immediately called his roommate's wife to run out. I don't know what hit his waist during the escape, so he fell to the ground. Fortunately, there was nothing serious, so I went to the hospital for a simple treatment. The other six people who were injured with Lao Liu, like Lao Liu, were all accidentally injured in the process of panic and escape.

After receiving the incident report, Huiyang District immediately launched the emergency rescue mechanism, organized personnel from public security, fire protection, housing construction, safety supervision and other departments to rush to the scene to participate in the rescue, and used life detectors to search, and no trapped people were found. On-site management personnel also conducted an emergency personnel count, and no missing persons were found. By about 8 o'clock that night, firefighters and others stopped searching.

According to the analysis of a construction engineer who participated in the rescue at the scene, judging from the mooring anchor of the steel wire rope at the scene, the steel wire rope fixing the shed is not buried deep enough, and the soil is soft, so an accident may occur in the case of instantaneous strong wind. In addition, the dumping place of the board house is relatively empty and the windward side is large, which are the main reasons for the accident.

According to the news released by Huizhou Meteorological Observatory official Weibo 16: 54, early warning signals of thunderstorm gale blue and hail orange were issued in Huicheng District, Zhong Kai District and Daya Bay District on March 20th 16: 45. The warning signals above Huiyang District have also taken effect!

People usually call it hail.

Hail is formed in convective clouds. Water vapor rises with the airflow and condenses into small water droplets after cooling. If the temperature continues to decrease with the increase of height and reaches below zero degrees Celsius, water droplets will condense into ice particles. In the process of upward movement, it will absorb small ice particles or water droplets around it and grow up until the updraft cannot bear its weight. When it falls to a higher temperature area, its surface will melt into water and absorb the surrounding small water droplets. At this time, if it is lifted by a strong updraft, its surface will condense into ice and snowball again and again until its weight is greater than the buoyancy of the air, that is, it will fall. If it reaches the ground, it is called hail. If it melts into water, it is the rain we usually see.

The formation of hail requires the following conditions: first, there must be a fairly thick unstable layer in the atmosphere;

Second, cumulonimbus clouds must develop to a height that can freeze a single large water drop;

Third, there must be strong wind shear;

Fourth, the vertical thickness of the cloud should not be less than 6 km ~ 8 km;

Fifth, cumulonimbus clouds are rich in water content;

Sixth, there should be inclined, strong and uneven updraft in the cloud.

Hail activity has three characteristics, and hail activity has obvious regional, temporal and seasonal characteristics.

Regionality is mainly manifested in: it mainly occurs in the mid-latitude mainland, usually more in the north and less in the south, more in the mountains and less in the plains, and more in the inland and coastal areas. This distribution is related to large-scale cold air activities and topography. China suffered severe hail disasters in southern Gansu, Longdong, the yinshan mountains, Taihang Mountain, western Sichuan and Yunnan Province.

The timeliness is mainly manifested in: from the time of daily appearance, afternoon to evening is the most, because this time period has the strongest convection. Hail does not last long, usually only a few minutes, but also lasts for more than ten minutes.

Seasonality is mainly manifested in: hail mostly occurs from April to 10. During this period, warm air is active and cold air is active, which is easy to produce hail. Generally speaking, hail in China mostly occurs in spring, summer and autumn.