Abstract:By using the reflectivity, radial velocity,Vertically Integrating L iquid (V IL) Water Content and other p roducts of Chengde
Dopp ler radar, a squall line p rocess happened in Chengde on 25 June 2008 was analyzed combining circulation situation and automatic
weather station data. Itwas discussed how Dopp ler radar echoes of the squall line in Chengde evolved. The results show the strongwind
locates in bulge spot of the bow squall line echo. The negative center value of radial velocity increased gradually then more than 27 m /
s and app roached the radar,which indicated that the strong wind would occur. V IL value increasing rap idly, reducing sharp ly and the
continued high Echo Top s (ET) value have corresponding relationship swith the strong wind, hail and so on.