Based on the weather system, stability index, dynamic, thermodynamic power and water vapor conditions, the heavy hail event in Pingliang area on May 30, 2005 was analyzed.

• 摘要从天气系统、稳定度指数、动力、热力和水汽条件等方面对2005年5月30日15时16分在平凉地区范围内的冰雹天气过程进行了分析。