To further examine the effectiveness of ascending and descending sections new round-trip drifting sounding system in forecasting high-impact weather such as heavy rainfall, this study, three assimilation experiments were designed for a rainstorm eastern China using WRF (Weather Research Forecast) WRFDA-3DVAR. Then, reasons improvement effects rainfall after analyzed from various perspectives. T...

Radar reflectivity assimilation is often used to initialize hydrometeors, which Numerical Weather Prediction (NWP) highly sensitive. To better this study further developed the background error covariance (BEC) with vertical and multivariable correlations of hydrometeor control variables (H-BEC) in WRF three-dimensional variational data system (WRFDA-3DVar). The impacts H-BEC are discussed using...