The mcc is composite of meso - , meso - and meso - scale convective systems which have different structure and motion features . although circularly approximately on the satellite imagery , the mcc shows linear distributions of radar echo , torrential rain , thunderstorm , cumulonimbus and mesoscale physical parameters as a squall line 它是中、和尺度对流系统组成的复合体,它在云图上近似圆形,其雷达回波、暴雨、雷暴、对流云、中尺度物理量场等却呈类似飑线的带状分布。