There will be a tornado on the Yangtze River. Is there a record? Why?

2. Tornadoes in nature were born in thunderstorm clouds. In thunderstorm clouds, the air disturbance is very intense, and the temperature difference between the upper and lower parts is very large. On the ground, the temperature is more than 20 degrees Celsius. The higher the altitude, the lower the temperature. At the top of the cumulonimbus cloud at an altitude of more than 8 thousand meters, the temperature is as low as MINUS 30 degrees Celsius. In this way, the cold air above drops rapidly, and the hot air below rises violently. When the updraft reaches high altitude, if it encounters strong horizontal wind, it will force the updraft to "upside down" (rotate downward). Due to the alternating disturbance at high altitude, it rotates and forms many small eddies. These small eddies gradually expand. The agitation became stronger and stronger, and finally a large vortex was formed. The large vortex first rotates around the horizontal axis, forming a horizontal air rotating column. Then, the two ends of the air rotating column gradually bend and slowly hang down from the bottom of the cloud. For the direction of cumulonimbus clouds, the cloud extending from the left is called "left tornado" and the cloud extending from the right is called "right tornado"; The former rotates clockwise and the latter rotates counterclockwise. Generally, the right tornado reaches the ground, and the left tornado has little chance to reach down.

There are also records of tornadoes in the Yangtze River basin.