Analyzing a Heavy Rainfall Process Based on Dual-Doppler Radar and Lightning Data

Abstract

In order tofurther understand the application of Doppler radar data in mesoscale weather system as well as thedynamical structureof precipitationsystem,a large-scaledand more accurate inversion resultis aimed to get,basing on the new ly-proposed fuzzy logical algorithm of cloud classification and the two-step variational method which is applied to dual-Doppler radar. The data come from Dual-Doppler Radar' s(S-band) observation in Hefei and Fuyang,Anhui province. A heavy rainfall processoccurred in Anhui Province on 7 ~ 10 June in 2010 is analyzed by utilizing vertical accumulative total liquid water content(VIL),rainfalland distribution of lightning. The results show that this persistentrainfall is associated with the wind fieldsw hichcantains a convergence in low er layers and a divergence in higher layers,a cyclonic wind rotation and a wind shear line. This rainfall process which is based on stratiformis show n to be a hybridcumuluscloudprecipitation. Besides,the stratiform lightning is few during this rainfall and mainly focuses on the negative ground flashes. The heavy rain occurred20 minutes or so after lightning. The value of VIL in this heavy rainfall is small,which is less than 3 kg ·m-2.There are strong relationships among cloudclassification,the area of rain,VIL and Radar's echo.