The Deformation Field in the Planetary Boundary Layer and Heavy Rainfall

In this paper, statistical analyst is was made on heavy rainfalls occurring in Hubei Province and the deformation field in the planetary boundary layer during Meiyu period of 1979—1981. It is found that heavy rainstorms are closely related to deformation field in the planetary boundary layer. Analyzing the deformation field in the planetary boundary layer gives a criterion for the movement and development of low pressure systems as well as an indication for the forecasting of heavy rain area in 12—24 hours