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中文摘要: 应用螺旋度理论结合湿度和稳定度条件对1999年8月11～12日产生在鲁东南和鲁中北部的大暴雨、特大暴雨天气过程进行了诊断分析。结果表明：暴雨产生在高温、高湿和不稳定大气中；500hPa以下低层k-螺旋度正值较大。暴雨产生在850hPa螺旋度中心附近。螺旋度的变化对天气系统的移动、发展及暴雨的落区和强度有较好的指示性；螺旋度还反映了大气垂直运动分布特征和旋转状况。
中文关键词: 特大暴雨，螺旋度，稳定度
Abstract:By using of the helicity theory,humidity and stability condition,the torrential rain in the southeast and the northern of the central Shandong province during August 11—12,1999 was diagnosed.The analysis results show that the rainstorm is produced in higher temperature,higher humidity and unstable atmosphere.There is higher positive k helicity at 500hPa and at low levels.Rainstorm occurs near the positive center of helicity at 850hPa.The variation of helicity indicates weather systems moving developing and falling area and intensity of torrential rain.Helicity also reflects the distribution of vertical moving and rotation status of atmosphere.
keywords: torrential rain,helicity,stability
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引用文本：
谭志华,杨晓霞,2000.“99.8”山东特大暴雨的螺旋度分析[J].气象,26(9):7-11.
,2000.Helicity Analysis on the Torrential Rain in Shandong in August 1999[J].Meteor Mon,26(9):7-11.
谭志华,杨晓霞,2000.“99.8”山东特大暴雨的螺旋度分析[J].气象,26(9):7-11.
,2000.Helicity Analysis on the Torrential Rain in Shandong in August 1999[J].Meteor Mon,26(9):7-11.