Based on the ECMWF ensemble data and NCEP 1°×1° reanalysis data, the characteristics of a heavy rainfall over the Sichuan Basin on June 30 in 2013 under interaction between Plateau Vortex (PV) and Southwest Vortex (SWV) are analyzed.Results show that:(1) PV moved eastward coupling with SWV which caused persistent heavy rainfall.Correlation coefficients of dynamic parameters (geopotential height and vorticity) between PV and SWV of ensemble forecast increased with time during the process indicating the characteristics of gradual coupling and intensifying of PV and SWV; (2) Ensemble sensitivity analysis can be used to reveal the sensitivity of rainfall to weather system and demonstrate the influence of vortex system on the heavy rainfall combined with geopotential height and wind fields.Heavy rainfall of this event was more sensitive to PV than SWV.When the forecast uncertainty of SWV of ensemble forecast was smaller, the forecast of PV was the key factor for forecasting of intensity and location of rainfall.Best ensemble members whose rainfall forecast was similar to the observed rainfall have stronger and easter location of PV compared to control member; (3) Heavy rainfall at night on June 30 was more sensitive to dynamic parameters of vortex systems than that in the day.Because heavy rainfall at night is caused by coupling of PV and SWV, which was characterized by more significant dynamic effect.In contrast, heavy rainfall in daytime was characterized by more significant thermodynamic effect.
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