The Impacts of Hydrometeors and Water Vapor in Stratiform Region on the Evolutions of MCSs and Embedded Convective Cells in a Pre‐Summer Rainfall Event Over South China

Both the stratiform and convective regions play important roles in development of mesoscale systems (MCSs). In this study, impacts hydrometeors water vapor region on evolution MCSs during a heavy rainfall event over South China are investigated by Weather Research Forecasting (WRF) model with Thompson microphysics. A series sensitivity experiments including reductions to 95%, 80% (water experiments), hydrometeor mixing ratios 10% (hydrometeor experiments) conducted, respectively. Results show that control run reasonably reproduces spatial distribution temporal rainbands. The flux convergence partly indicates changes convection organization movement direction. intensities precipitation significantly weakened decreasing moisture advection experiments, but little weaker experiments. enhanced reduced sedimentation evaporation rain responsible for restoration cloud. more is generally conducive than less one when they at same stage. However, it found stronger cell can also exist generated old cloud its dissipating stage, owing transfer from regions.