风暴相对螺旋度在昌吉州大降水中的应用分析

对2007—2011年5—9月昌吉、阜康、天池3个气象站大降水天气过程的风暴螺旋度（基于乌鲁木齐雷达风廓线产品）和雨量随时间的变化进行分析，结果表明：SRH数值与降水量值无明显的线性关系，降水强度的变化普遍滞后于SRH强度的变化，可根据SRH推断降水的生消；SRH正值开始时间超前于降水开始时间，有提前预报量；SRH极大值出现时间大多数超前于降水极大值出现时间，对短时（临近）预报业务有较好的指示意义。

The application analysis of storm relative helicity to heavy rain in Changji

Based on the data from the Urumqi radar wind profiler in Changji, Fukang and Tianchi meteorological stations from May to September during 2007-2011 rainfall with time during heavy rainfall processes occurred, the changes of storm relative helicity were analyzed. The results indicated that there is no significant linear relationship between SRH value and precipitation that changes generally lag behind the changes in the intensity of SRH, so it is possible to deduce the occurring and dissipating of precipitation according to SRH; the time of the positive SRH starts earlier than the start time of precipitation and it is useful for early prediction; most of the SRH maxima appear ahead of that of precipitation maxima and it is rather meaningful for short-term forecasting and nowcasting.