Minute-level Precipitation Characteristics of a Heavy Rain on July 20,2012 in Sichuan

The minute-level precipitation characteristics of a heavy rain during 20~18 July 2012 isusing by using statistical method and data from expanded automatic weather stations,including minute and hour level rainfall,wind,temperature,atmospheric pressure,relative humidity and etc..The result showed that this precipitation process contains two stages.The characteristics of strong precipitation in the first stage included high precipitation rate,shorter precipitation duration and higher precipitation mutability,which may be the reasons that this kind of strong precipitation is hard to forecast exactly.In the second stage,the strong precipitation possesses longer precipitation duration,and higher precipitation rate.Besides,the study also shows that synthesizing the automatic observing stations' wind data,temperature data and atmospheric pressure data can provide a certain time interval for prediction of strong precipitation.