A continuous heavy rain process occurred in South China from 17 to 24 June 2006, during which there existed two rain-bands, one in the north and the other in the south. The north rain-band （over the north and central part of Fujian Province） was resulted from frontal systems and the south rain-band （over the east and central part of Guangdong Province） was in the warm areas before a front. The double rainband phenomenon has attracted much attention of Chinese meteorologists. In order to investigate the causes of frontal and warm-area heavy rains and deepen the knowledge of the two kind heavy rains, the heavy rain case is analyzed in details as a typical example of the double rain-band event with hourly surface rainfall and 6-hour NCEP reanalysis data. The main physical differences between the frontal and warm-area heavy rains are revealed. It is found that there exist obvious differences not only in the meso-scale rain mass activities, dynamic structure, instability mechanisms, and vertical heating profiles between Meiyu front and warm-area heavy rain systems, but also in the moisture transportation, meso-scale environment and vertical circulation related to heavy rainfall. These differences may be the reason why the heavy rainfall in warm areas before a front is difficult to simulate and forecast.
Meteorological Science and Technology
Meiyu front in South China, heavy rainfall, convective instability, upper/lower level jet