%0 Journal Article %A LI Gaiqin %A DU Liya %A ZHAO Haiqing %A XU Qinge %A WU Limin %A WANG Cong1 %T Multi-scale Diagnosis of a Strong Precipitation Process in the North of He’nan %D 2016 %R 10.11755/j.issn.1006-7639(2016)-05-0828 %J Journal of Arid Meteorology %P 828-835 %V 34 %N 5 %X

A strong precipitation process occurred on 8 July 2013 in Puyang of He’nan. By using conventional observation data, NCEP reanalysis data, automatic meteorological station data, satellite cloud images and Doppler weather radar data, the meso-scale characteristics and the causes of this strong rainfall were diagnosed and analyzed. Results are as follows: (1)It was a shear line storm process. The high-level trough moving eastward, subtropical high strengthening and moving northward, southwest warm moist flow strengthening, shear line at the low and middle levels and surface inverted trough developing were circulation characteristics. Heavy precipitation occurred in the unstable atmosphere, at the same time, its environmental field characteristics were low-level plenty vapor and severe convergence and high-level severe divergence. Heavy rain center occurred near the warm shear line on the top of “人” shaped shear at low-middle level, and the cold and warm air cyclonic strongest convergence region on the top of surface inverted trough. (2)On cloud pictures, β-scale convective clouds developing strongly along the convergence line of surface inverted trough moved northward and merged the local convective clouds over Puyang into α-scale MCS, and the convective strong precipitation area located in the strong convective region and nearby the front of the MCS. Here the lowest TBB reached 203 K. (3)On radar pictures, multiple mesoscale short band echoes merged into strong vortex zonal banded echo and moved northward. This banded echo and convective echo near Puyang merged into strong echoes, which rounded and stranded over Puyang, and the strong precipitation formed. Low-level southeast inflow and middle-level large strong southwest inflow formed strong mesoscale convergence rotating wind field around radar station, which increased updraft movement and formed extreme convective strong precipitation.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2016)-05-0828