ANALYSIS OF THE MESO-β CONVECTIVE CLOUD CLUSTER OVER MEIYU FRONTON 3 JULY 2003

In term of meteorological satellite sensing data and processed products, the mesoscaleaspects of a rainstorm system occurred over the north of An hui province on 3 July 2003are analyzed.It suggests that there are 11 meso-β convective cloud cluster developed with 100 km in spatial scale and 5 h in time scale.High humidity, positive vorticity and upwardcurrent, which lead to the energy release of the high humidity baroclinic instability and the development of meso-β cloud cluster, help making for the environment for heavy precipitation.The other characters making for heavy precipitation is that the high contents of ice for potential precipitation and ice in cloud on the upper of the water coagulation profile of clouds with the maximum of 0.8 k/kg, the highest height 18 km, and the brightness temperatureon the top of these clouds under-80 ℃.