What is the hail like in Zhongshan, Guangxi?

What is the hail like in Zhongshan, Guangxi? Why does it hail? On the morning of 4th, with the rain, the first spring thunder of 20 18 sounded in Zhongshan.

08: 18 A large-scale hailstorm broke out in Zhongshan County, lasting for 20 minutes. Finally, after a strong and intensive hail rain, the hail process ended.

Hail dotted the grass like stars.

According to the correspondent's on-the-spot observation, the largest hail landing this time has a maximum diameter of 50 mm, and it is rare for hail to land in Zhongshan County on a large scale. According to the analysis of meteorologists, the heavy hail process in Zhongshan County was caused by the violent rise of the humid and unstable atmosphere in front of the cold front caused by gravity waves.