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Mesoscale Analysis of a Heavy Rainfall Causing Mud-Rock Flow

Xu Shuangzhu 1 Jin Qi 1 Xiao Yanjiao 1 Li Jun 2(1 Wuhan Central Weather Office, Wuhan 430074;2 Institute of Heavy Rain, CMA, Wuhan 430074)  
By analyzing a heavy rainfall that brought out a mud-rock flow in the central Hubei Province from 8 to 9 July 2003, it was found: (1) the meso- and samll-scale system resulted in directly the heavy rainfall; (2) the occurring locations of the mud-rock flow are situated in a geographically special zone in Hubei Province, such as Zigui, Yichang, Yidu, etc, the transitional zone of plain and mountainous areas where mud-rock flow disasters occurs frequently; (3) the local short-range heavy rainfall was the direct cause of the mud-rock flow; (4) the source area of the meso-scale system was related to the topography, and meso-scale systems form frequently on the downwind hillside under southwest winds; (5) Doppler radar is a useful tool for monitoring the meso-scale system, and a mid-α scale cloud cluster may include one or even more mixed echo masses or belts; (6) the mesoscale vortex formed near the strong vorticity center on the left side of the lower-troposphere jet.
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