Diagnostic Analysis of a Regional Rainstorm on the Loess Plateau in Northern Shaanxi
NCEP 1 ° × 1°reanalysis data and 288 automatic stations data in the east of the Loess Plateau were used to analyze the regional heavy rainstorm process on July 10,2018.The results show that the interaction be-tween the bottom glide trough of the cold vortex and the warm and humid air flow around the subtropical high is the main cause of this rainstorm.Long distance typhoons strengthen the low-level jet stream,and the coupling of high-level and low-level jet streams provides a strong dynamic condition for the occurrence of rainstorm.The extension of θse energy tongue towards the Hetao area and the afternoon warming aggravated the energy growth,which together provided the thermal conditions for the rainstorm area.The typhoon moves westward and the sub-tropical high lifts northward,causing the system to slowly move eastward and affecting the long-term mainte-nance of the system over northern Shaanxi,which was an important factor causing sustained heavy precipitation.
万方数据
维普
