Analysis of torrential rain process and its disaster assessment during 0509 typhoon MATSA

The torrential rain process of regional typhoon MATSA from August 8 to 10 in 2005 in Liaoning was analyzed based on conventional meteorological data,automatic weather stations data and satellite data.It indicated that the torrential rain was the result of interaction among typhoon,subtropical high and west wind trough.Preferable water vapor was one of the important conditions to come into being typhoon rainstorm.Low level jet was not only the transport pathway of water vapor,but also one of the obvious characteristics of typhoon torrential rain.At the same time,the time and the site of typhoon MATSA landing were estimated according to continual air pressure changes in single station and cloud system changes.Using a rapid assessment model of torrential rain event based on probability analysis,the torrential rain disaster was evaluated.It showed that the grade of torrential rain disaster was third grade.