Can the Assimilation of the Ascending and Descending Sections’ Data from Round-Trip Drifting Soundings Improve the Forecasting of Rainstorms in Eastern China?

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. The results showed that data can increase accuracy regions precipitation improve forecasting. quality wind field improved data, which conditions moisture transport, resulting increased humidity lower layer, accumulated more unstable energy development storms. In addition, enhanced low-level convergence created strong upward motion, was conducive to triggering thus improving ability forecast rainfall.