On the evening of June 16, it was reported on the Internet that a tornado occurred in Conghua District, Guangzhou. Subsequently, the Meteorological Bureau of Conghua District confirmed that a tornado occurred in Taiping Town, Conghua district around 19:25 on June 16. (after the tornado in Taiping town) The scale of the tornado is very small. The meteorological station of Taiping No. 2 middle school, which is nearest to the tornado (about 700m), recorded a level 6 gust (12.6m / s). According to the feedback of witnesses on the scene, the life history of the tornado is about 3 minutes. At present, the meteorological department is investigating the tornado weather. How do tornadoes form? Tornadoes are small-scale unstable processes of air flow, and their diameters are generally between 200-300 meters. At present, research shows that tornadoes are the product of thunderstorms in the cloud layer, a small part of the huge energy of thunderstorms, and a way of concentrated release in a very small area. (after the tornado in Taiping town.) The formation of tornadoes can be roughly divided into four stages. At the initial stage, due to the instability of the atmosphere, a strong updraft was generated. Affected by the airflow of the environmental field, it was further strengthened. In the weather radar echo map, there was a hook echo, and when viewed directly, there was purple. The intensity of tornadoes decreases from the center to the periphery. In the second stage, the interaction of cold and warm air makes the updraft begin to rotate in the middle of the troposphere, forming a mesoscale cyclone. In the third stage, the mesoscale cyclone extended to the ground and high altitude, and its own strength continued to increase. At this time, a small area of convergence is formed inside the cyclone, which is the parent body of the tornado and has become the core of the tornado since then. In the fourth stage, the core wind speed of the tornado is large enough to make the tornado extend from the ground to the upper air, causing a sharp drop in ground pressure and a sharp rise in wind speed, forming a tornado, which is similar to a typhoon on land. Although tornadoes are strong, they do not last long, often only a few minutes to dozens of minutes, and the longest is no more than a few hours. The average moving speed is 15 meters / second, and the moving length is about 10 kilometers, or even only tens of meters. Tornadoes are one of the most violent convective storms. Although they do not last long, they often occur with thunderstorms, hail and other severe convective weather, and often cause serious disasters. At present, the integrated meteorological detection system is constantly improving, but it is still difficult to capture tornadoes, which are small-scale and fast-moving weather systems. (Xinhua News Agency)