Analysis on Severe Convective Weather Characteristic in Henan Based on Flow Pattern Identification and Physical Elements

Using the conventional high,surface observations,sounding and radar data,the meso-scale weather comprehensive analysis and the physical parameter analysis,the occurring and developing environmental conditions of thunderstorm wind and regional hail in Henan region from May to September of 2001-2010,and the characteristics and regular patterns of three types of severe convective weather in Henan Province were studied.(1)The typical features of severe convective weather in henna are summed four conceptual models of mesoscale weather analyses are established,that is,northeast vortex at the back of vortex trough,north vortex,low trough and the southwest airflow on the edge of the subtropical high,the key elements and the quantitative reference indices of severe weather analyses under different flow patterns are provided.(2)On the basis of circulation classification,the organic relation and significant differences of different weather situations,different types of severe convective weather and different physical parameters are discussed from the thermal,dynamic,water vapour and other basic conditions of severe convective weather.The sensitive physical parameters and element characteristics are found by analysing three types of severe convective weather thunderstorm winds,hail and gale hail,the indicators and thresholds of physical elements of the different severe convective weathers are summed up,which provide reference for forecasting and early warning for the future thunderstorms,hail and other severe convective weather.(3)The evolution features of occurrence,development,movement and so on about the severe convective weather radar echo systems in different flow patterns are briefly concluded by analysing radar echoes of the severe weather cases.