Analysis on Characteristics of Elevated Thunderstorms Behind Cold Fronts in China During Spring
To study the physical mechanisms of elevated thunderstorms, the conventional observations and comprehensive monitoring data of severe convective weather are used to analyze the spatial and temporal characteristics of elevated thunderstorms and the associated severe weather events in spring of China. The results show that spring elevated thunderstorms behind cold fronts often happen in Southern China. They have diurnal variations and often accompaning with hail and short duration severe precipitation. Low and high level jets, low level shear lines and west troughs at 500 hPa are the important impact weather systems. The following three parameters can be used to predict the development of elevated thunderstorms: relative humidity at 850 hPa and 700 hPa exceeds 70%, temperature difference between 700 hPa and 500 hPa is at least 16℃, and a southwesterly jet is at 700 hPa, a low level shear line and a trough at 500 hPa.