摘要
Ⅰ.INTRODUCTION By using conventional synoptic data and very dense hourly surface observations in NorthChina covering 110°—119°E, 35°—42°N, with station distance of 70—90 km in mountainous area and 30—60 km in plain area during 1966—1980, we have analysed some meso-scale systems in this district and found that the meso-scale low in PRL on the eastern side of the Taihang mountains occurs more frequently than other
