Simulation and Comparison of Two Kinds of Severe Convective Weather Processes

Based on radar data and ground weather phenomenon, two kinds of severe convective weathers, hail and gale process and tornado process, are simulated by the model MM5. The simulated radar echo and actual radar echo are analyzed. Simulated micro-physics and dynamic characteristic are researched. The possible reasons of the difference with microphysical and dynamic characteristic between two kinds of severe convective weather are discussed. The results are as follows. (1)Simulated effect with two kinds of severe convective weather was good about the simulation of radar echo, so simulated radar echo had certain reliability. (2) That snow crystal was located above 0°C level is showed by the microphysical simulation of hail process. The isoline of wave band, comparatively with rain-water was crowded. The cloud-rain mainly distributed below 0°C level, and was scattered distribution. The rain distributed below and above 0°C level. That cloud water continuously distributed below 0°C level was showed by microphysical simulation of tornado process. The rainwater distributed below 0°C level. The rainwater content distributed less below 0°C level, but mainly distributed above 0°C level, also the value was big, the isoline was crowded. The cloud ice content also presented scattered distribution. (3)The severe convective weather process corresponded to the strong lifting movement from the simulation of dynamic characteristic, but the region of strong lifting movement did not distribute specific position of the echo band.