【摘要】 利用常规天气图、物理量场和雷达回波等资料对2015年7月14～15日运城暴雨天气过程进行分析。结果表明:2015年7月14日降水过程的主要影响系统为蒙古冷涡、低空切变及地面暖低。高空蒙古冷涡叠加低层暖脊,在雨区上空形成这种上冷下暖的不稳定层结,有利于强对流系统发生、发展。500 hPa蒙古冷涡长时间维持为运城对流性降水提供了有利的条件。7月14日运城12个县站出现35℃以上高温,其中8个县站出现37℃以上的高温,大范围高温为此次对流天气提供了不稳定能量。K指数、 SI指数及CAPE值对强对流天气发生有较好的指示意义。更多还原

【Abstract】 The heavy rain process in Yuncheng from 14 to 15 July 2015 was analyzed by using conventional weather map, physical quantity field and radar echo data. The results show that the main influencing systems of precipitation on July 14, 2015 are Mongolian cold eddy, low altitude shear and low ground temperature. The upper Mongolian cold eddies superimpose the lower warm ridges and form the unstable stratification over the rainy area, which is conducive to the occurrence and development of the strong convective system. The long-term maintenance of 500 h Pa Mongolian cold eddy provides favorable conditions for convective precipitation in Yuncheng. On July 14, 12 Yuncheng County stations had high temperatures above 35℃, and 8 of them had high temperatures above 37℃. The large-scale high temperatures provided unstable energy for the convective weather. K index, SI index and CAPE value are good indicators for the occurrence of severe convective weather.更多还原