This paper explores the time-lagged impact of the spring sensible heat (SH) source over the Tibetan Plateau (TP) on the summer rainfall anomaly in East China using the WRF model. Numerical experiments indicate that a positive spring SH anomaly over the TP can maintain its impact until summer and lead to a strong atmospheric heat source, characterized both by enhanced SH over the western TP and enhanced latent heating (LH) of condensation to the east. The strong summer atmospheric heat source over the TP induces the excessive precipitation in the Yangtze and Huaihe River (YHR) basins through generating steady wave train associated with the large scale circulation response, leading to upward motion in YHR basins by eastward warm advection, meanwhile providing synoptic triggers for the torrential rainfall events (See the schematic diagram).

Figure. Schematic diagram showing the physical process of the time- lagged impact of the spring SH source over the TP on the summer rainfall anomaly in East China.