[Commentary] At the beginning of "Lixia", from May 5th to 7th, due to the influence of strong cold air and the warm and humid airflow in the southwest, Gansu, the "spring rain is as expensive as oil", experienced the first regional heavy precipitation in 2020, which is also this year. In the first provincial rain shower, convective weather such as hail and short-term heavy rain appeared in some places.
On the afternoon of the 6th, in Ganan Zhuoni County, heavy rain with hail continued for nearly 15 minutes. Dense hail fell from the sky, with a maximum hail diameter of 28 mm. After the firefighters of Zhuoni County arrived at the scene, they found that many roads in the county were covered with thick hail. Most people and vehicles were trapped on the hail road. The firefighters conducted rescue in groups to guide the evacuation of the trapped people. At the same time, there was a short-term heavy rainfall in Longxi County, Dingxi City, especially in the low-lying areas of the urban area. The road area was severe and the water depth did not exceed the calf.
[Same period] Zhang Peng, Deputy Director of Gongchang Fire Rescue Station, Longxi County Fire Rescue Brigade, Gansu Province
After we arrived at the scene, the water depth was about 50 cm. After our collaborative treatment, it was arranged for more than half an hour. Now the water level has dropped to about 30 cm.
[Explanation] In the afternoon of the 7th in Lanzhou City, two consecutive days of precipitation caused the recent high temperature of 33 ℃ to plunge to 13 ℃.
The reporter learned from the Lanzhou Central Meteorological Station that during this weather, a variety of disastrous weather, such as heavy rain, hail, high winds, and strong cooling, and frost weather will also appear, and the precipitation will continue.
[Same period] Di Xiaohong, chief forecaster of Lanzhou Central Meteorological Station
This heavy rainfall will cause some risks of geological disasters, and will also have an adverse effect on transportation and agriculture and animal husbandry, and precipitation will continue in the future. Although the intensity is not great, but the duration is relatively long, it will increase the risk of a geological disaster. In addition, it is said that along with this precipitation process, the temperature in various places has also dropped. After the continuous cooling, on the 9th and 10th, the sky will be clear.
【Explanation】 Gansu Province is deeply inland in the northwest, and the arid and semi-arid area accounts for 76% of the province's area. It is a climate change sensitive area and a fragile ecological environment. For a place known as "nine years and nine droughts", it can be said that "hope for rain is more afraid of rain", and the fragile ecological environment is prone to natural disasters such as flash floods and debris flows due to extreme weather such as short-term heavy precipitation.
Gao Ying, Dang Guofei, Lou Yuantao, Lanzhou, Gansu reported
Editor in charge: [Liu Xian]