Analysis of A Heavy Rainstorm Process in Liaoning Province

Based on the synoptic chart,physical field,satellite nephogram and meteorological elements from a single station,a weather process of typical rainstorm occurring in the liaodong peninsula involved wide area during the period of August 18th to 20th of 2009 was integratively analyzed.It was showed that the weather process resulting from both the upper trough and the subtropical high.The trigger mechanism might lie in:the Baikal cyclone splitted cold air and the riverain cold air going eastward,forming eddy,the subtropical high going up westward and northward with warm wet flow cutting in via its rim.The upper jet stream accelerated the transportation of cold air and vapor,on which right saw several active convective cloud cluster,gradually combining with the Baikal cyclone going southward.Then the heavy rainfall occurred.On the analysis of the physical field and surface meteorological elements,this process was a typical rainstorm situation.