A spring gust front occurred on April 17，2003 over Ji’nan was analyzed by using Doppler radar data．A typical density cur-leat outt]ow boundary(gust front)characteristic was retrieved，which presented a strong nalTow bow echo belt before a wide weak echo region on Doppler radar echo images．Diferent elevation velocity fields showed a reasonable spatial structure of the gust front．The characteristic of the gust front on Doppler Radar echo images presented the length was long(short)at low(high)elevation and the dis—tance was far(near)at low(high)elevation．A typical midaltitude radial convergence(MARC)at the height of2．5—7 km on velocity vertical profileindicated an evident rear middle—levelinflow．A phenomenonthatthegustfrontwas near the groundwas foundwith radar elevation increase．

A spring gust front occurred on April 17，2003 over Ji’nan was analyzed by using Doppler radar data．A typical density curleat outt]ow boundary(gust front)characteristic was retrieved，which presented a strong nalTow bow echo belt before a wide weak echo region on Doppler radar echo images．Diferent elevation velocity fields showed a reasonable spatial structure of the gust front．The characteristic of the gust front on Doppler Radar echo images presented the length was long(short)at low(high)elevation and the distance was far(near)at low(high)elevation．A typical midaltitude radial convergence(MARC)at the height of2．5—7 km on velocity vertical profileindicated an evident rear middle—levelinflow．A phenomenonthatthegustfrontwas near the groundwas foundwith radar elevation increase．