Hail types and Distribution of Related Factors

Currently, many researchers have studied the hail cloud system from different aspects. Mainly including: the relationship between development of the thundercloud and the changing of meteorological elements; the analysis of the distribution character of hail spectrum; observation of the micro-structure of the hail cloud with the satellite and radar; distinguish the hail cloud from thundercloud with the lighting counter; simulate the micro-scale physics of the hail and test the effectiveness of hail suppression, etc. These play an important role in the forming of theories of hail forecast and hail suppression. To improve detect result, China has developed some devices, such as dual polarization radar and a line polarization radar; semiconductor refrigeration hail slicer; hail slicer like machine tool; lighting counter; electric field instrument in the air; inverted atmosphere mean electric filed instrument; smart rain gauge, etc. These devices could help us understand the natural better. However, there is not a device that used to decide hail quantity. In 1987 AnYing Shi et.al discussed the error of measuring hail by developing “Automatic hail rain sub-detector ". Huanbin Xu described part of the data measured by the instrument, summarized the distribution of factors about hail in the trial of the "Hail suppression and hail cloud physics works" .It put the observation technology of hail to a big step forward and will play a key role on the hail forecast and hail suppression. However, the focus of discussion was different, so the difference between hail categories was not given; The potential implications of the three physical factors, the amount of hail 、rainfall and the ratio K was not deeply studied. And thus we can not understand the continuous, comprehensive, integrated feature of hail and rain. With regards to this, automatic hail rain subdetector was laid out at Weixian, Shangyi, Chicheng, Wanquan, Zhuolu, and Chongli of Zhangjiakou in Hebei province and has obtained 16 times of selfrecording paper about hail weather system. By doing the rain hail sub-file and simultaneously reading analysis of the achieved self-recording paper of hail weather system detected from automatic hail rain sub-detector, we obtained the 5 types of hail and the distribution of related factors:1.hail whose intensity  1. Yuwen Sun, Weather Modification Office of Hebei Province, China, 050021; E-mail: [email protected]. is in a super large class;2.hail whose intensity is in subclass;3. hail which has a large total amount with a devastating disaster;4.hail whose amount shows a pulse surge;5. weak hail cloud with a long duration, hail in a small amount and a weak intensity. Making thorough research to the character of the five classers will guide the study of the structure of hail cloud and hail from the generation of embryos and will provide observational data for the simulation of hail formation and floor. It also will help us understand the production, development and disappearance of the hail clouds, enrich the theory and improve the effect of hail suppressionhail suppression.