Analysis on the Cause of Regional Rainstorm in Ningxia on July 28,2019
[Purposes]The mechanism of this rainstorm process was analyzed in order to provide refer-ence for the forecast of rainstorm in Ningxia in the future.[Methods]Using the hourly reanalysis data of ECMWF ERA5,the cause of the regional rainstorm in Ningxia on July 28,2019 was revealed by means of circulation analysis and physical quantity diagnosis.[Findings]The results showed that the precipitation process was caused by the front area formed by the cold air moving southward and the northward exten-sion of the subtropical high under the background of the east-high and west-low circulation.The warm moist air around the sub-high brings enough moisture to supply the needed moisture for the process.The shear lines of 700hPa and 850hPa and the front areas of the middle and lower layers satisfy the condi-tions of dynamic uplift and add unstable energy.[Conclusions]The northern part of Ningxia was domi-nated by the frontal precipitation,while the central and southern had convective cloud development in the warm region,which coupled with the rise of the frontal surface,resulted in the superimposition of con-vective clouds and the increase of precipitation intensity.
Ningxia rainstormeast high and west lowwarm region precipitationmiddle and low level frontal area
万方数据
维普
