Analyses on Radar Echo Characteristics and Meso Microscale Systems of Short Time Rainfalls in Western Mountain ous Area of Fujian
Utilizing conventional meteorological data, T Inp and the Longyan and Jianyang CINRAD/SA data, the radar echo characteristics and meso microscale systems of short time rainstorms in western mountainous area of Fujian are analyzed. The results show that the short time torrential rainfall echoes can be classified for continental convective precipitation and tropical marine precipitation. Besides, the relationship between the convective precipitation, the tropical marine precipitation’s low level reflectivity factor and rainfall intensity are statistically analyzed. The rainfall echoes are classified for local developed stagnation echo and “train effect” echo which constantly affects certain regions according to the impact time of rainfalls. Based on the evolution of radar echoes, base velocities and weather systems, three types of meso microscale systems which lead to short time rainstorms are extracted. The first is meso scale shear line or convergence line related to low level shear line (trough) and southwest jet. The second is low level shear line or convergence line which moves to south. The third is adverse wind area or mesocylone related to local convections.