ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Diagnostic Analysis of Unbalanced Force of Atmospheric Motion and an Abrupt Heavy Rain during July 1998
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Abstract:
An abrupt heavy rain event occurred in Wuhan from 20 to 22 July 1998 is analyzed by using conventional and satellite data. The results show that: (1) The event was caused by a meso βscale convective cloud cluster. (2) The meso β scale system is not related with strong cyclone vorticity or ant cyclone vorticity center in lower or upper troposphere. The divergence strength of the system is higher 101s-1 than that of vorticity. (3) 10 hours before its occurrence, the atmospheric motion was already unbalanced. After the precipitation, its intensity got strongest and it changed into U >0 from U <0. (4) The unbalanced force of lower atmospheric motion and strong divergence in the upper atmosphere are led to the initiation and development of the meso-βscale system as well as the occurrence of heavy rain.
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