Abstract:Based on the CIND3830 CC weather radar data and surface observational data in Puer City, this study reports the statistical characteristics of 27 times of three body scatter Spike (TBSS) in C band weather radar from 2004-2013, the corresponding relation between hails shooting on the ground and TBSS as well as the application of TBSS in hailstorm warning. The results are as follows: (1) The reflectivity range of TBSS echo is 55.0-68.4 dBz, and 70% TBSS appears when reflectivity factor is ≥ 60 dBz. (2) TBSS maintaining time is 10-79 min, and 63% is above 20 min. (3) TBSS usually happens in the height of 4.0-9.5 km, and the minimum/maximum height is 2.6 km/11.4 km. (4) TBSS is 5.6-22.4 km in length, and 1.5-14.6 km in width. The width of TBSS is proportional to the area of echo (at least 60 dBz) along the radially lateral direction, but the length does not have clear correspondence with the reflectivity factor. (5) Hailstorm weather happens in the case of 59% echoes with the occurrence of TBSS. The severe hail appears in 11% of the radar echo. (6) Hailstorm forecasting time by TBSS is 5-100 min in advance, 34.5 min on average when TBSS and hailstorm appear together. (7) When TBSS and hailstorm both happen, the width of TBSS is proportional to the size or density of hailstorm. Furthermore, the reason that TBSS appears but hailstorm does not come down simultaneously is discussed, and the forecasting hailstorm methods, with the accuracy of 89% and 94% respectively, are also found out by using TBSS combining DVIL and 45 dBz strong echo height or TBSS combining echo breadth and 45 dBz strong echo height (Critical Success Index are 0.89 and 0.94).