Analysis of a Rare Rainstorm in Kashgar in Summer 2022
The rainstorm process in Kashgar on August 9,2022 was analyzed by using hourly precipitation observation data of regional automatic stations,NCEP(1°×1°)reanalysis data,hourly cloud top brightness temperature of FY-2G satellite and Doppler radar data.The results showed that the 100 hPa South Asian high was east-type distribution,and the Lake Balkhash cutting low pressure and the Baikal trough formed the"east-west clamping"situation in the rainstorm process.The water vapor in the Tarim Basin was transported to the rainstorm area by the 850 hPa easterly jet.The 850-400 hPa pseudo-equivalent potential temperature decreased with height and the low-level contours were dense.The configuration of low-level convergence and high-level divergence provided favorable dynamic conditions for rainstorm.The heavy rain was caused by two continuous mid-β scale convective clouds with strong convective development,whose moving paths had a superposition effect in Kashgar.The precipitation area was almost consistent with the low TBB area,and the heavy precipitation occurred in the center of cloud with TBB＜-28 ℃.The radar echoes were arranged in a multi-cell storm line,and merged with new cells in the path direction and developed into a southwest-northeast squall line during movement,with the strongest reflectance factor above 55 dBz and the echo top height above 8 km.After the squall line broke,the echoes moved slowly and the strong ones lasted for a long time,which caused short-term heavy rainfall in Kashgar.
万方数据
维普
