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Analyses on Variation Characters of Vertically Integrated Liquid Water Content about Hail Cloud Cell in in Southwestern Guizhou

WANG Fen et al(The Meteorological Bureau of Southwestern Guizhou,Xingyi,Guizhou 562400)  
Using the Xingyi new generation of Doppler weather radar complex scan data as original materials and WSR-88D algorithm VIL(Vertically Integrated Liquid Water Content),VIL about cell was calculated with its theoretical model.And the maximum of VIL was identified by using of max function.The concepts of VILH and VILD were introduced.The distributive characteristic of VIL,VILmax,VILH and VILD were analyzed to the 12 hail cells in 2007 to 2008 of southwestern Guizhou province.Results showed that the hail cells begun to drop when VIL reached the maximum value.After the hailstones ending,the VIL value dropped rapidly.In time sequence curves,the VIL was in peak form.There were "explosive increasing" and "explosive decreasing" phenomena around the time in the evolution process of each hail cell.There were no shooting on the ground after the first VIL max increasing until the occurrence of second increasing about 1 to 2 time interval after the first increasing.There was no first "explosive increasing" before the second shooting in the same cell,and the hail shooting on the ground stopped with the occurrence of "explosive decreasing".Analyzed from the seasons,the average value of the VIL,VILmax,VILH and VILD of March and April was the maximum,followed by May and June.The one in August was the minimum.
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