Diagnostic Analysis of a Local Heavy Rain at the Edge of Subtropical High

Based on the conventional meteorological data,FY-2C meteorological satellite cloud pictures and Doppler weather radar,etc.,a local sudden heavy rain process happened from the evening to the night of August 13,2010 in Henan Jiaozuo City at the foot of the Taihang Mountains was analyzed by using weather diagnosis methods.As indicated by the results,westerly trough,subtropical high,level wind shear line,surface cold front and warm inverted trough were main synoptic scale systems;The energy front has been formed before heavy precipitation.Under the wet on dry atmospheric stratification,the severe convective weather was triggered by the gradual moving of surface cold front to southeast.Low-level convergence and high-level divergence field configuration enhanced the pumping effect of the atmosphere and led to strong vertical ascending motion over the heavy rain area,thus contributing to the strengthening of precipitation and providing dynamic conditions for the generation of heavy rain.The merge and strengthening of three convective clouds in the satellite images was the main reason to cause short-term heavy precipitation in Jiaozuo.The products of reflectivity,echo tops,vertically integrated liquid water on the radar chart had a good indication of the significance of heavy precipitation.