Analysis of Vertical Helicity for the Heavy Rainfall in Anshan Area

Based on the routine observation data and NCEP grid data on July 10-11 2012,the vertical heliciy was applied to analyze the process of heavy rainfall in Anshan area.The results were as follows :the indicative role of vertical heliciy is much more sensitive to heavy rainfall compared with some other physical quantities such as divergence 、vorticity and vertical velocity.The precipitation intensity and coverage will increase when the positive center and area of vertical heliciy become magnified.The trend that vertical helicity is positive at lower levers and negative at upper levels contributes to the prosperity of rainfall.And the heavy rainfall is easy to come out in front of the positive center of vertical helicity.