Why is there a sudden strong convective weather like a tornado in Yancheng, Jiangsu?

The cause of this tornado disaster. According to the analysis of experts from Jiangsu Meteorological Observatory, the Huanghuai area was located at the northwest edge of subtropical high on the 23rd, with high temperature, high humidity and good convection potential. On that day, there was a cold vortex in Yancheng area, which cooperated with the low trough moving eastward and southward. There was a low vortex shearing eastward in the middle and lower layers, a cyclone on the ground and cold air behind it. There is strong wind shear in the low-level southwest jet and the middle-high northwest jet, which is triggered by the convergence of strong wind direction and wind speed on the ground, resulting in tornadoes.

Experts say that the extreme weather caused by hail and tornado is accidental, and it is very coincidental that they meet. It is almost unprecedented that severe extreme weather of hail and tornado occurred in Jiangsu at the same time.