Why is there a hail disaster in Guangdong Dragon Boat Festival?

Hail disaster is a serious meteorological disaster caused by strong convective weather system. Although it appears in a small range and in a short time, it is fierce and strong, and is often accompanied by sudden disastrous weather processes such as strong winds, heavy precipitation and sharp cooling.

Hail has the following characteristics:

(1) has strong locality, and the impact range of each hail is generally about tens of meters to thousands of meters wide and hundreds of meters to tens of kilometers long;

② The duration is short, a storm or hail usually lasts only 2 ~ 10 minutes, and a few last more than 30 minutes;

(3) It is significantly affected by the terrain, and the more complex the terrain, the greater the possibility of hail;

(4) The interannual change is great. In the same area, some years occur several times in a row, and some years occur several times or even do not occur;

⑤ The occurrence area is wide, and it can occur in a wide range of climatic zones from subtropical zone to temperate zone, but the frequency of occurrence is mostly in temperate zone.