ON THE PROGRESS OF APPLICATION FOR DYNAMIC AND ENERGETIC CONVECTIVE PARAMETERS ASSOCIATED WITH SEVERE CONVECTIVE WEATHER FORECASTING

The severe storm is caused by deep convection,and its development needs thermodynamic instability and a proper dynamic environment.Deep convective index and convective available potential energy present the potential of upward convection,while convective available potential energy reflects the whole thermodynamic structure in troposphere impliedly.Downdraft convective available potential energy and wind index present the downw ard convection and micro-downburst respectively.Downward convection is closely related with the altitude of the dry intrusive,the dryness of the air,the instability and the humidity of the low-level at mosphere.A proper vertical wind shear is favorable to severe storm.Severe storms,especialy supercells,are always associated with high helicity which maintains a longer life cycle.The storm relative helicity is a predictive fact or for severe storms.Bulk Richardson number reflects the balance between convective energy and dynamic ef fect.Energetic helicity index reflects the combination of the buoyancy energy and the dynamic effect.Both severe storm index and Swiss thunderstorm index are good examples for the use and the development of convective parameters.The combination of dynamic and energetic parameters is recommended in operational weather forecasting,and it is also recommend that multiple parameters should be used concurrently in order to reflect varied kinds of severe storms.Outlooks are made for the use of convective parameters in severe weather forecasting deduced by numerical model out put.