Synoptic Model Analysis of Severe Convective Weather Systems Nephsystem over Tibet Areas

The most vigorous severe convective weather nephsystem occurred during June–August over Tibet areas.The highest rate in the severe convective weather which the convective cloud caused was thunderstorm.Most of the thunderstorm occurred in the edges of the cloud,with hailstones appeared together.By utilizing the satellite images and surface chart,upper air chart data from 2005 to 2009 from the MICAPS,the severe convective of Tibet areas was divided into two types of systemic and non-systematic.The nephsystem was compared with the thunderstorm,hail and other convection extinction development relations.Combined with the reflection of actual weather in the evolution,concluded the shear line,trough-line,vortex and weak pressure field four kinds of convection weather learning model.