石家庄市一次强对流暴雨天气分析

Analysis on a Severe Convective Rainstorm Weather in Shijiazhuang

通过常规天气资料、物理量和雷达回波,对2010年7月31日石家庄市一次强对流天气进行了总结分析。结果发现,此次强对流暴雨发生前副高长时间控制石家庄市,石家庄市连续多天处在高温、高湿的闷热天气当中,对流层存在高度的不稳定状况,850 hPa切变和地面冷锋是触发不稳定能量释放的主要因素,水汽主要来自低层偏南气流的水汽输送。多普勒雷达观测表明,降水回波强度均在35dBz以上,最大回波强度达到55 dBz,回波顶高度超过15 km。

A strong convective weather on July 31,2010 in Shijiazhuang City was summarized and analyzed based on routine weather information,physical quantity and radar echo.The results indicated that before the occurrence of this severe convective rainstorm,Shijiazhuang City was under the control of subtropical high for a long period and in high temperature and high humidity for many days;the troposphere was highly unstable,850 hPa shear and surface cold front were the main factors of the release of instability-energy,in addition,water vapour mainly came from water vapour transport of lower-level southerly flow.Doppler radar observation indicated that the intensity of precipitation echo was above 35 dBz,the maximum intensity of precipitation echo achieved 55 dBz,the height of echo top exceeded 15 km.