Analysis of Two Hail Weather Processes in the Centre of Yunnan during Spring

The routine meteorological data，NCEP 1°×1°reanalysis data and the CINRAD/CC Doppler Radar data in Kunming are used to analyze two hail weather processes appearing in the middle of Yunnan．The results show that:The 4.11 process is tough－ridge moving of system，it is typical low－level shear falling－hail with cold tough condition in the high level，but 3.22 process is a general convective process that is a general falling－ hail．Three θ line in the top have different degrees of left leaning in V－3θ graph about these two processes，θse and saturated θse are irregular bended，"wasp waist"structures appear at the same time and the clockwise rolling flow in the low layer，the anti－ clockwise rolling flow in the high layer occurred before hailing．The clockwise rolling flow appears weakening or disappearing at the end of the hail，inversion cold clouds appear in the low layer with 4.22 hail process，do not appear with 3.22 hail process．The convective stability of the 4.11 hail process is stronger than that of the 3.22 hail process with the index analysis．The characteristics of hook echo，obvious inflow gap，echo suspension，positive and negative velocity(weak shear) ，height of strong echo getting to 7km appear in radar images，and so on．The characteristics of echo suspension，the strong echo stretching height reached 5km，and there is not the positive and negative velocity in 3.22 hail process．