Study on the kinematic characteristics of precipitation system observed at Chujado, Korea on July 15, 2009

In summer rainy season, Korean peninsula is influenced by several severe weather phenomena such as Changma-front, typhoon, strong low pressure, and local heavy precipitation. To find out the development mechanism of these phenomena, we have performed intensive field observation experiments in Chujado (33.95°N, 126.28°E) which were located at the southern part of Korea. We analyzed the synoptic condition by using NCEP/NCAR reanalysis data, kinematic characteristics of precipitation system by dual Doppler radar analysis, and vertical thermal condition by sounding data. In this study, one case was chosen and analyzed. The precipitation was occurred in rear of Changma-front and the rainfall of 72 mm was recorded at Chujado (from 07 LST to 16 LST 15 July 2009). The convergence areas were formed in the southern part of Korea due to distribution such as strong low pressure from Maritime Province of Siberia, high pressure from northern part of China, and low pressure from southern part of the Japanese islands. When the precipitation system was passing through the analysis area, strong wind was shown at the layer of 900 ~ 300 hPa. The precipitation system was divided into two cells, which had a main cell and newly developed cells. The enhancement was occurred in convergence (-4x10^-3 s^-1) with time at the low level of new convective cells, since south-westerly winds flowed into the rear side of newly developed cells, continuously. As strong convergence was developed, upward wind reaching up to 8 m s^-1 was intensified in the core area of new convective cell, while weaker upward wind was shown in main cell from 8 m s^-1 to 4 m s^-1 . We will analyze this phenomenon in more detail and hope to discuss at the conference.