东南沿海地区中α尺度雷暴云团卫星云图特征分析

利用GMS-5卫星IR、VIS、WV和分裂窗云图资料及常规天气图对1996～1999年3～9月发生在我国东南沿海地区的对流(雷暴)天气进行分析表明，对流(雷暴)天气主要发生在静止锋等六种不同的天气形势下，它们在卫星云图上的基本数字特征有相同之处，也存在明显的差异。通过对卫星云图中α尺度雷暴云团的灰度和局地标准差等基本数字特征的分析，发现局地标准差极大值或红外一分裂≤0极小值的出现，预示4h左右后雷暴云团将达最强。由此，可以较好的把握雷暴云团的发展阶段以及发展趋势，提高雷暴的预报水平。

THE CHARACTERISTIC ANALYSIS OF SATELLITE IMAGES OF MESO-α SCALE STORM CLOUD CLUSTERS IN THE SOUTHEAST COAST REGION

The analysis of the convective weather phenomena (thunderstorm) occurring in the southeast coast region in China by using the GMS-5 IR, VIS and WV satellite images and usual weather charts from March to September during 1996-1999 show that the convective weather phenomena (thunderstorm) mainly take place under six different kinds of weather situations, their basic digital features of satellite images are identical, but they also can be obviously different. By analyzing the basic digital features of different satellite images in detail, we find if there are the maximum of local standard deviations and the minimum of IR minus splitting window, which is less than and equal to zero, the storm cloud clusters will reach the strongest after about four hours. So the development stages and tendency of convective weather phenomena can be understood much better, and the forecast ability of thunderstorms will be improved.