Radar Climatic Characteristics of Convective Storms During Warm-Season in Northern Ningxia
Long-time series of Doppler radar products of Yinchuan from May to September of 2011-2016 are used to analyze the climatic characteristics of convective storms in northern Ningxia. The results indicate that 77% of all convective storms in northern Ningxia lasted for no more than 30 min and moved at a speed of 9-13 m·s-1. Most of them mainly moved eastward at higher speeds compared to the moving speeds in other directions. The maximum reflectivity factor of convective storms was concentrated between 35-50 dBz, the echo top height was between 5-9 km, and the vertical integrated liquid water content was generally less than 10 kg·m-2. The 500 hPa wind was the steering flow of convective storms. The probability of convective storm occurrence was lower when 500 hPa and 700 hPa were controlled by northerly winds, but relatively high when controlled by southerly winds. July was the peak month for convective storms, and the peak hours were 12:00 BT to 13:00 BT. Helan Mountain was the area with the highest occurrence of convective storms, followed by the sandy areas from the central-north of Lingwu to the north of Otog Front Banner. The distribution of convective storms was not uniform in Helan Mountain, and the most frequent occurrence was in the areas between high mountains and deep valleys.